Rio RIO09HP115V1A, RIO09HP230V1A, RIO12HP230V1B, RIO12HP115V1A, RIO18HP230V1A Installation, Service & Troubleshooting
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DUCTLESS SYSTEM
Installation, Service & Troubleshooting
Models:
RIO09HP115V1A
RIO12HP115V1A
RIO09HP230V1A
RIO09HP230V1B
RIO12HP230V1A
RIO12HP230V1B
RIO18HP230V1A
RIO24HP230V1A
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Table of Contents
Safety Precautions & Warnings.........................................................................................................................
Model Number Identication............................................................................................................................
Physical & Electrical Data.................................................................................................................................
Product Introduction.........................................................................................................................................
Refrigeration Cycles and Components............................................................................................................
Indoor & Outdoor Components.......................................................................................................................
Basic & Protection Functions............................................................................................................................
Remote Control Operation................................................................................................................................
Refrigerant Lines, Connection, Evacuating and Charging............................................................................
Installation and Filter Maintenance.................................................................................................................
Electrical Schematics..........................................................................................................................................
3
4
5 - 7
8
9 - 13
14 - 15
16 - 21
22 - 25
26 - 29
30 -35
36 - 44
Outdoor Circuit Board........................................................................................................................................
Troubleshooting Indoor Components..............................................................................................................
Troubleshooting Outdoor Components...........................................................................................................
Fault Codes & Status Displays...........................................................................................................................
Troubleshooting Flow Charts............................................................................................................................
Disassembly of Indoor Units.............................................................................................................................
Disassembly of 9,000 & 12,000 btuh Outdoor Systems.................................................................................
Disassembly of 18,000 and 24,000 btuh Outdoor systems.............................................................................
Appendix 1 - 3 Temperature Sensor Resistance Tables..................................................................................
45
46 - 47
48 - 56
57 - 78
79 - 105
106 - 111
112 - 117
118 - 123
123 - 129
2
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Safety Precautions & Warnings
!
Installing, starting up, and servicing air conditioner can be
hazardous due to system pressure, electrical components,
and equipment location, etc. Only trained, qualied
installers and service personnel are allowed to install, startup, and service this equipment. Untrained personnel can
perform basic maintenance functions such as cleaning
coils. All other operations should be performed by trained
service personnel. When handling the equipment, observe
precautions in the manual and on tags, stickers, and labels
attached to the equipment. Follow all safety codes. Wear
safety glasses and work gloves. Keep quenching cloth and
re extinguisher nearby when brazing. Read the instructions
thoroughly and follow all warnings or cautions in literature
and attached to the unit. Consult local building codes and
current editions of national as well as local electrical codes.
Recognize the following safety information:
Warning: Incorrect handling could result in
!
personal injury or death.
Caution: Incorrect handling may result in minor
!
injury, or damage to product or property.
Warning
!
• Never install the unit in a place where a combustible
gas might leak, or it may lead to re or explosion.
• Make a proper provision against noise when the unit is
installed at a telecommunication center or hospital.
• Provide a GFIC circuit when the local or national
electric code requires it.
• Never wash the unit with water.
• Handle unit transportation with care. Use two people
when the weight exceeds the capacity for one person.
• Never touch the heat exchanger ns with bare hands,
sharp edges could cause personal injury.
• Never touch the compressor or refrigerant tubing
without proper hand protection.
• Do not operate th unit without the air lters in place.
• Should any emergency occur, stop the unit and
disconnect the electrical supply.
• Properly insulate tubing running inside the room to
prevent water damage from condensation.
!
All installation or repair work shall be performed by your
dealer or a specialized subcontractor as there is the risk of
re, electric shock, explosion or injury
Caution
Warning
!
All electrical work must be performed by a qualied,
licensed electrician according to local and national
codes as well mas the instructions provided in the
manual.
• Before installing, modifying, or servicing the
system, the main electrical disconnect must be
off. There may be more than one disconnect
switch. Lock out and tag switch with a suitable
warning label.
• Never supply power to the unit unless all wiring
and tubing are completed, reconnected and
checked.
• This system adopts highly dangerous electrical
voltage. Incorrect connections or inadequate
grounding can cause personal injury or death.
Refer to your local and national codes for proper
grounding.
• Have the unit properly grounded with all
connections tight. Loose connections can cause
overheating and a possible re hazard.
Warning
!
Warning
Pressurized Refrigerant
Personal injury could result in failure to follow this warning.
Systems contain oil and refrigerant under high pressure,
proper refrigerant handling techniques should be
completed by a qualied technician.
!
Warning
Live Electrical Components
Personal injury, property damage, or death could result in
failure to follow this warning.
Follow all electrical precautions when servicing this
system, it may be necessary to service or troubleshoot with
live electrical circuits. All work should be completed by a
qualied technician.
3
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Model Number Identication
Product Catalog Number-Nomenclature
Example RIO24HP230V1AH
RIO 24 HP 230V 1 A H
S - System
O - Outdoor
H - Indoor High Wall
D - Indoor Duct
C - Indoor Cassette
F - Indoor Floor/Ceiling
RIO
NEO
TERRA
Revision Level
09 - 9,000 btuh
12 - 12,000 btuh
18 - 18,000 btuh
24 - 24,000 btuh
AC - Cooling Only
HP - Heat Pump
HC - Heat/Cool
Style/Color Designation
230V - 208/20V 60Hz 1PH
115V - 115V 60Hz 1PH
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Physical & Electrical Data, cont.
Model RIO09HP115V1A RIO12HP115V1A
System Type Heat Pump
Power Supply 115v / 60Hz 115V / 60Hz
Rated Current Cooling Amps 9.0 15.0
Rated Current Heating Amps 9.5 15.5
System Performance
Cooling Cap (Min/Max) Btu/h 9,000 (3,500-11,000) 11,800 (3,300-12,500)
Heating Cap (Min/Max) Btu/h 9,800 (2,500-11,000) 13,000 (3,400-13,500)
Operating Range - Cooing deg F 64 - 113 64 - 113
Operating Range - Heating deg F 5 - 75 5 - 75
System Specications
Compressor Type DC Inverter-driven Twin Rotary
Sound Pressure - Outdoor dBA 53 55
Net/Gross Weight Indoor lbs 19/26 19/26
Net/Gross Weight Outdoor lbs 75/84 75/84
Condenser Coil Type
Refrigerant/Charge oz R410a /37.5 R410a / 41.1
Line Set Size Liq. - Suction 1/4” - 3/8” 1/4” - 3/8”
Pre-Charged Lineset Ft. Feet 25 25
Additional Refrigerant
charge/additional feet
Max. Total Piping Length Feet 66 66
Max. Elevation Feet 33 33
MCA Amps 13 15
MOCP/Breaker Size Amps 20 25
Wire Size to Outdoor Unit, #
of Wires per Local Code
Wire Size and # of
Conductors from Indoor to
Outdoor unit
oz 0.2 0.2
awg 14* 12*
14awg/4c*
*Comply with National Electric Code or Local Electric Code in selecting proper wire and circuit breaker
size. National Code or Local Code, should supersede wire sizes above.
Note: The manufacturer reserves the right to modify the design and/or change the specications without notice. Please
Note: The manufacturer reserves the right to modify the design and/or change the specications without notice. Please
refer to specic installation manual for current information.
refer to specic installation manual for current information.
5
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Physical & Electrical Data, cont.
Model RIO09HP230V1A & 1B
System Type Heat Pump
Power Supply 208-230v / 60Hz 208-230V / 60Hz
Rated Current Cooling Amps 3.9 5.4
Rated Current Heating Amps 3.4 4.7
System Performance
Cooling Cap (Min/Max) Btu/h 9,000 (3,800-11,500) 12,000 (3,300-12,500)
Heating Cap (Min/Max) Btu/h 9,000 (3,300-11,500) 12,000 (3,400-12,500)
Operating Range - Cooing deg F 5 - 109 5 - 109
Operating Range - Heating deg F 5 - 75 5 - 75
System Specications
Compressor Type DC Inverter-driven Twin Rotary
Sound Pressure - Outdoor dBA 49 52
Net/Gross Weight Indoor lb 19/25 20/27
Net/Gross Weight Outdoor lb 64/73 68/77
Condenser Coil Type
Refrigerant/Charge oz R410a / 26.1 R410a / 35.3
Line Set Size Liq. - Suction 1/4” - 3/8” 1/4” - 3/8”
Pre-Charged Lineset Ft. Feet 25 25
Additional Refrigerant
charge/additional feet
Max. Total Piping Length Feet 50 50
Max. Elevation Feet 33 33
MCA Amps 10 10
MOCP/Breaker Size Amps 15 15
Wire Size to Outdoor Unit, #
of Wires per Local Code
Wire Size and # of
Conductors from Indoor to
Outdoor unit
oz 0.2 0.2
awg 14* 14*
14awg/4c*
RIO12HP230V1A & 1B
*Comply with National Electric Code or Local Electric Code in selecting proper wire and circuit breaker
size. National Code or Local Code, should supersede wire sizes above.
Note: The manufacturer reserves the right to modify the design and/or change the specications without notice. Please
refer to specic installation manual for current information.
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Physical & Electrical Data, cont.
Model RIO18HP230V1A RIO24HP230V1A
System Type Heat Pump
Power Supply 208-230v / 60Hz 208-230V / 60Hz
Rated Current Cooling Amps 7.9 11.5
Rated Current Heating Amps 11.8 13.0
System Performance
Cooling Cap (Min/Max) Btu/h 18,000 (4,500-21,000) 22,000 (6,400-24,000)
Heating Cap (Min/Max) Btu/h 19,200 (4,000-23000) 24,200 (4,100-26,600)
Operating Range - Cooing deg F 5 - 109 5 - 109
Operating Range - Heating deg F 5 - 75 19 - 75
System Specications
Compressor Type DC Inverter-driven Twin Rotary
Sound Pressure - Outdoor dBA 56 53
Net/Gross Weight Indoor lb 27/35 33/44
Net/Gross Weight Outdoor lb 106 / 117 115 / 126
Condenser Coil Type
Refrigerant/Charge oz R410a / 45.9 R410a / 54.7
Line Set Size Liq. - Suction 1/4” - 1/2” 1/4” - 1/2”
Pre-Charged Lineset Ft. Feet 25 25
Additional Refrigerant
charge/additional feet
Max. Total Piping Length Feet 82 82
Max. Elevation Feet 33 33
MCA Amps 15 17
MOCP/Breaker Size Amps 25 25
Wire Size to Outdoor Unit, #
of Wires per Local Code
Wire Size and # of
Conductors from Indoor to
Outdoor unit
oz 0.2 0.2
awg 14* 14*
14awg/4c*
*Comply with National Electric Code or Local Electric Code in selecting proper wire and circuit breaker
size. National Code or Local Code, should supersede wire sizes above.
Note: The manufacturer reserves the right to modify the design and/or change the specications without notice. Please
refer to specic installation manual for current information.
7
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Product Introduction
System Overview
e RIO Ductless split heat pumps are single zone
units available in size from 9000 btuh to 24,000 btuh
providing heating and cooling. All comfort settings
are controlled by a remote control. e RIO unit has
many features to enhance comfort and eciency. e
operation of these features will be explained later in
this service manual.
Superior inverter technology is used to control
capacity while maintaining maximum eciency.
e RIO systems are equipped with G10 inverter
technology providing precise control over the
compressor frequency based on operating pressures
and temperatures. Should an abnormal condition
occur, the soware will adjust the compressor
frequency or shut down the system indicating the
appropriate fault.
Indoor Display
e indoor unit contains a digital display, which
will indicate the current fault. e evaporator,
swing motors, fan motors and circuit board are also
components of the indoor unit. e indoor units have
a on/o switch to bypass the remote control if lost or
batteries fail. is will be explained later in this service
manual.
e systems require R410A and are pre-charged for 25’
of lineset. Please refer to your installation manual for
additional charge for linesets longer than 25’.
e maximum allowable line li and distances vary
by model, please refer to the charts in the manual for
proper lineset applications.
e systems use a PVE oil and should require no
additional oil. All RIO units utilize an Oil Return
Mode which will return oil to the compressor should
the need arise.
Circuit Board with
G10 Technology
8
Compressor
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Refrigeration Cycles and Components
Refrigeration Components
Indoor Unit
Temperature
Sensor
Heat Exchanger
Strainer
Outdoor Unit
Heat
Exchanger
Temperature
Sensor
Electronic Expansion
Val ve
Accumulator
Compressor
Inverter
Compressor
4-way
Discharge Sensor
Note:
Component locations may vary depending on models.
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Cooling Mode
Cooling Mode
Refrigeration Cycles and Components
Outdoor Unit
Strainer
Indoor Unit
Heat Exchanger
Temperature
Sensor
Strainer
Temperature
Sensor
*Electronic
expansion
valve
Accumulator not
Exchanger
on all sizes
Heat
Compressor
Inverter
4-way
4-way
valve
valve
Discharge
Silencer
Discharge
Temperature
Sensor
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Refrigeration Cycles and Components
Cooling Mode
A. Hot gas is discharged from the compressor. e temperature of the gas is monitored by the Discharge
Temperature sensor and sent to the outdoor control panel.
B. e hot gas is directed through the 4-way valve, then enters the outdoor coil. e hot gas will be slightly
subcooled, however there are no pressure ports to take measurements.
C. e subcooled liquid will enter the lter to remove contaminates.
D. e subcooled liquid will enter the metering device and regulate the superheat level. e adjustment process
and compressor speed are controlled by the outdoor circuit board.
E. e refrigerant leaving the metering device will be in a low pressure/temperature saturated state. is cold
saturated refrigerant will move through the coil absorbing heat. is liquid will ash to a vapor and will be
superheated to about 10 degrees F. Since this tubing is cold, it must be insulated.
F. e superheated vapor will be returned to the outdoor unit’s 4-way valve.
G. e refrigerant will ow to the accumulator (not all models will have an accumulator) where liquid and vapor
are separated.
H. e refrigerant will ow to the compressor and complete another refrigeration cycle.
e control board will monitor the temperature and pressures and adjust the frequency of the compressor. ere
are no pressure charts to evaluate temperature or pressures.
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Heating Mode
Refrigeration Cycles and Components
Outdoor Unit
Filter
Indoor Unit
Heat Exchanger
Temperature
Sensor
Temperature
Sensor
*Electronic
expansion
valve
Accumulator not
Exchanger
on all sizes
Heat
Compressor
Inverter
4-way
4-way
valve
valve
Discharge
Silencer
Discharge
Temperature
Sensor
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Refrigeration Cycles and Components
Heating Mode
A. Hot gas is discharged from the compressor. e temperature of the gas in monitored by the Discharge
Temperature sensor and sent to the outdoor control panel.
B. e hot gas is directed through the 4-way valve to the appropriate indoor coil making the line a hot gas line.
C. e hot gas will enter the indoor coil and condense to a saturated mix as it travel through the coil and will be
slightly subcooled.
D. e refrigerant returns to the outdoor unit through the lter, then through the metering device reducing the
refrigerant to a low pressure liquid and will maintain the proper superheat.
E. e cold refrigerant will travel through the outdoor coil (evaporator) and will pickup heat from the outdoor
air. is will cause the cold saturated refrigerant to ash to a saturated mixture which will be superheated to
10 degrees F.
F. e superheated vapor will travel through the 4-way valve to the accumulator which will prevent liquid
oodback.
G. e superheated gas will enter the compressor for another refrigeration cycle.
e control board will monitor the temperature and pressures and adjust the frequency of the compressor. ere
are no pressure charts to evaluate temperature or pressures.
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Indoor Unit Components
Indoor Unit Components
RIO 12,000 btuh model
Other RIO models may very slightly.
Indoor Circuit
Board
Indoor Tube ermistor
Fan Motor
Swing Motor
Ambient
Temperature
Sensor
Note:
Component locations may vary depending on models.
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Outdoor Unit Components
Outdoor Unit Components
RIO 12,000 btuh Outdoor Unit
Other RIO models may very slightly.
Outdoor Fan
Capacitors
Outdoor Sensor, (mounted
on outside of coil)
AP1 Board
4-Way Valve
Expansion Valve
Exhaust Temp
Sensor
Crankcase Heater
Note:
Component locations may vary depending on models.
Outdoor Tube
Sensor
Compressor
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Basic & Protection Functions
Basic Functions
e compressor should stay o for at least 3 minutes before starting the unit. e compressor circuit has a 3 minute delay if
the compressor is de-energized during a run cycle. If the compressor starts from a de-energized cycle, there will be no time
delay. e compressor has a minimum runtime of 6 minutes regardless of room temperature.
1) Cooling Mode
Cooling Process
When the indoor ambient rises 4 F above the preset temperature from a stopped state, the unit will start the cooling cycle.
e outdoor fan and compressor will start. e indoor fan will run continuously at the selected speed. e outdoor unit
will monitor the appropriate temperatures and pressure and adjust the compressor speed and the EEV as required. If the
indoor ambient is > 4 F than the preset temperature, the compressor will increase the frequency; < 4 F the compressor
will begin reducing the frequency. e EEV will be closed on indoor units with no cooling requirement. e G10
technology will control compressor speed based on indoor load and compressor amperage. When the indoor temperature
is satised, the compressor will stop, then 30 seconds later the outdoor fan will stop. When the cooling mode transfers to
heating mode, the 4-way valve will be energized aer a two minute compressor delay.
Evaporator Freeze Protection
e soware will monitor the indoor evaporator coil form freezing.
e following will occur 6 minutes aer the compressor has been operating in the cooling or dry mode:
If the evaporator temperature drops below 36 F, the compressor will operate at a reduced frequency. If the evaporator
is below 30 F for 3 minutes, the compressor will stop, 30 seconds later the outdoor fan will stop. In cooling mode, the
indoor fan and swing motor will remain on. If the evaporator temperature is >= 50 F and the compressor is o for at least
3 minutes, the compressor will resume its normal operation state.
Overcurrent Protection
e soware will monitor the compressor current to maintain it in a safety and reliable operating range.
If the total current is greater than the rating, the compressor will stop; the outdoor fan will continue to run for 30 seconds,
then stop.
2) Dry Mode
Drying Process
is feature will not take the place of a dehumidier, it is intended to dry the lter and slightly cool the air. If the indoor
ambient temperature is greater than the preset temperature, the unit will enter the cooling and drying mode, in which
case the compressor will operate and the indoor fan will run at a low speed. When the indoor ambient temperature is at or
below the preset temperature, the unit will operate in it previous running state. When the indoor ambient drops to more
than 4 F below the preset temperature the compressor will stop running, then 30 seconds later the outdoor fan will stop,
the indoor fan will run at low speed.
- 2 F
60 Sec 60 Sec
30 Sec 30 Sec
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Basic & Protection Functions
Basic Functions
3)Heating Mode
Heating Process
When the indoor ambient drops 4 F below the preset temperature, the unit will start the heating cycle. e outdoor
fan, compressor and 4-way valve will operate. e indoor fan will operate in the “Cold Air Prevention” mode in which
the indoor fan will have a 2 minute delay aer the call for heating. e indoor evaporator coil temperature must reach
104 F before the indoor fan will start, this will prevent cold air from discharging from the indoor coil. When the indoor
evaporator coil temperature is > 104 F, the indoor fan will operate at low speed for 1 minute. With 1 minute of operation
or 2 minutes of no fan operation and the indoor evaporator coil temperature is > 108 F, the indoor fan will operate at its
preset condition.
If the indoor ambient temperature is < 9 F and > 2 F of the preset temperature, the unit will run in its original mode of
operation.
If the compressor is running and the mode is changed from heating to cooling, the compressor will stop, the 4-way valve
will be de-energized 2 minutes later, the outdoor fan will stop aer a 1 minute delay.
If the indoor ambient temperature is >= 9 F than the preset temperature, the compressor will stop and the outdoor fan will
stop aer a 30 second delay. e indoor fan will continue to operate at its preset mode.
e G10 technology will determine compressor frequency based on ambient temperatures.
+9 F
+ 2 F
Stop heating
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Basic & Protection Functions
Basic Functions
Defrost Process
You may force a defrost in heat mode by pressing the “+” and “-” buttons alternately three times within 5
seconds.
1) e unit will enter defrost when the following conditions are met:
A. Outdoor ambient <= 41 F
B. Compressor had accumulated more than 3 hours of operation in heating mode
C. e outdoor coil <= 32 F
Note: e compressor runtime will be cleared when the outdoor ambient is > 41 F or when the compressor has started
up aer changing to cooling or drying mode and defrost has nished. e runtime will not be cleared when the unit has
stopped aer reaching the setpoint temperature, a protection fault or changing to fan mode.
ere are 3 perimeters used in the defrost algorithms, Outdoor ambient(T
a calculated T
T
compensation
D. Aer power-up, for the rst defrost T
E. T
F. T
compensation
is calculated by the following:
tube > 36 F then T
outdoor
tube <= 36 F then T
outdoor
compensation = 32
compensation = 32
compensation = 37
F
F
F
ambient), Outdoor tube(T
outdoor
outdoor
tube) and
2) When heating has operated continuously for 45 minutes, or accumulated for 90 minutes, the unit will enter defrost
mode in 3 minutes aer meeting any of the conditions below:
A. Outdoor ambient >= 41 F and outdoor coil <= 28 F
B. 28 F <= T
C. 23 F <= T
D. 14 F <= T
ambient< 41 F, “Toutdoortube -Tcompensation ≤ 21F”
outdoor
ambient < 28 F <= Toutdoortube -Tcompensation ≤ 18F”
outdoor
ambient < 23 F , T
outdoor
outdoor
tube -T
compensation
<= (T
ambient - 37 F)
outdoor
E. Toutdoorambient < 14 F, Toutdoortube -Tcompensation <= (Toutdoorambient - 37 F)
3) During defrost, if run time for the compressor does not reach 3 minutes, the defrost cycle will not start for the next
2 hours. At that time the compressor stops operation and 30 seconds later the outdoor fan will stop. 30 seconds aer
this the 4-way reversing valves will de-energized. Following another 30 second delay, the compressor will increase its
compressor speed for defrosting. Defrosting will last for 450 seconds or until the T
tube >= 50 F, at this temperature
outdoor
the compressor will decrease it compressor speed for 30 seconds, then will stop. In another 30 seconds the 4-way valve will
energize, the 60 seconds later the compressor and outdoor fan will start. e compressor speed for defrosting will be 85hz.
During Defrost mode, a “H1” will be displayed on the indoor front panel display indicating the user selected mode has
been overridden and the system is performing a outdoor coil defrost operation.
4) Defrost Sequence:
When a defrost condition has been met, the compressor will stop, all expansions valves will open fully, the outdoor fan will
stop 40 seconds aer the compressor stops. e 4-way valve will reverse direction (cooling mode) , then the compressor
will start and enter the defrost frequency. e control, board along with ambient sensors will calculate defrost time.
5) Oil Return:
Oil return condition can be met if the unit operates at a low frequency for an extended time. e indoor display will
indicate “H1” for this condition and is a normal procedure.
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Basic & Protection Functions
Basic Functions
Cold Air Prevention (Heating mode with compressor running)
e system guards against discharging cold air in heating mode. It will delay the indoor fan until the evaporator coil has
warmed up to discharge warm, comfortable air into the room.
1) When the T
ambient < 75 F and the T
indoor
to run at low speed aer a 2 minute delay. is will reduce cold air upon heating startup. Within 2 minutes, if
T
tube > 104 F, the indoor fan will run at low speed. Aer 1 minute of operation, the fan will run at the preset fan
indoor
mode. Within 1 minute of low speed operation or 2 minutes of no fan operation, with the T
run at the preset mode.
tube <= 104 F with the fan in a stopped state, the indoor fan will begin
indoor
tube > 108 F, the fan will
indoor
2) If the T
ambient >= 75 F and the T
indoor
at the preset mode. Aer 1 minute of low speed operation, if the and the T
tube <= 108 F the indoor fan will run at low speed for 1 minute than run
indoor
tube > 108 F the fan will operate at its
indoor
preset mode.
Note:
e T
Overcurrent and Speed Protection (Total Current = I
ambient in 1 & 2 above refers to the unit going into the heating mode coming out of defrost.
indoor
)
total
e soware will monitor the compressor current draw and adjust the compressor speed in order to maintain the inverter and
compressor in a safety and reliable operating range.
A. If I
B. If I
C. If I
D. If I
<= 13a, an increase in frequency will be allowed
total
>= 15a, increasing the frequency is not allowed.
total
>= 17a, the compressor will decrease its frequency
total
>= 19a, the compressor will stop and the indoor fan will stop aer 30 seconds.
total
4)Fan Mode
Under this mode, the fan will run at the preset speed and the outdoor fan, compressor and 4-way valve will stop.
5)Auto Mode
Auto Mode Process
Setting the auto mode will run the unit in heat or cool automatically depending on T
1)Operating Parameters
A. If the T
B. If the T
C. When the T
ambient >= 79 F the unit will operate in cooling mode. e set temperature is 77 F.
indoor
ambient <= 72 F the unit will operate in heat mode. e set temperature is 68 F.
indoor
ambient <= 73 F and >= 77 F, the unit will operate in the previous state. If it is energized
indoor
for the rst time, it will run in Fan mode
D. In auto mode, the cooling frequency will be the same as the cooling only mode and the heating frequency will
be the same as the heating only mode.
2) Protection
A. In cooling operation, protection is the same as the cooling only mode
B. In heating operation, protection is the same as the heating only mode
C. When the indoor ambient temperature changes, the operation mode will be automatically selected. Once started
the compressor will have a 6 minute runtime.
indoor
ambient
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Basic & Protection Functions
Protection Functions
Common Protection Functions and Fault Displays
Coil High Temperature Protection
T
= measured temperature of outdoor coil in cooling mode, measured temperature of indoor coil in heating mode.
tube
1) Outdoor Coil High Temperature Protection - In cooling mode the soware will monitor the outdoor coil for an
abnormal high temperature condition.
A. If T
B. If T
C. If T
D. If T
2) Indoor Coil Temperature Protection - In heating mode the soware will monitor the indoor coil for an abnormal high
temperature condition.
A. If T
B. If T
C. If T
D. If T
<= 126 F, the unit will return to its original operation state
tube
>= 131 F, frequency rise is not allowed
tube
>= 136 F, the compressor will run at reduced frequency
tube
>= 144 F, the compressor will stop and the indoor fan will operate at preset speed
tube
<= 122 F, the unit will return to its original operation state
tube
>= 127 F, frequency rise is not allowed
tube
>= 133 F, the compressor will run at reduced frequency
tube
>= 140 F, the compressor will stop and the indoor fan will blow residual heat and then stop
tube
3) Compressor Discharge Temperature Protection
e soware will monitor the compressor discharge for an abnormal high temperature condition.
A. If T
B. If T
C. If T
D. If T
>= 208 F, frequency rise is not allowed
tube
>= 217 F, the compressor will run at reduced frequency
tube
>= 230 F, the compressor will stop
tube
<= 194 F and the compressor has been off for at least 3 minutes, the compressor will resume operation
tube
4) Compressor High Pressure Protection (Not available on 115v 9k & 12k models)
When the high pressure switch is detected for 6 seconds or more, the compressor will stop and can only be started by
powering o the unit. Dirty coils, refrigerant overcharge and outdoor fan problems can cause this fault.
5) Compressor Phase-lacking Protection
If one of the compressor phases are detected open before startup, the compressor will enter phase-locking protection.
e malfunction will be cleared aer 1 min, then the unit will try a restart. If an error has been detected for 6 times
continuously, the compressor will lock out and will need to have power cycled. e errors will be cleared aer the
compressor has run for 7 minutes continuously.
6) Module Protection (IPM)
Under module protection mode, the compressor will stop. When the compressor remains o for 3 minutes, the compressor
will resume operation. If the module protection occurs six times in succession, the compressor will remain o. Power will
need to be cycled to start unit. is is a thermal protection for the indoor module.
7) DC Buss Voltage Protection
e soware will monitor the DC bus voltage.
If voltage on the DC Bus is below 150 or over 420v, the compressor will stop and the outdoor fan will stop in 30 seconds.
When the voltage on the DC bus returns to normal and the compressor has been o for 3 minutes, the compressor will
resume its operation.
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Basic & Protection Functions
Protection Functions
8) Communication Fault
If the unit fails to receive correct signals for a 3 minutes, communication fault will occur and the whole system will stop
and a “E6” will be displayed on the front panel of the indoor unit.
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Remote Buttons
Remote Control Operation
Note:
is remote control is used in other models and some
features may or may not be available. Consult the
owners manual for specic features for your model.
ere should be no obstructions between the remote
control and the indoor unit for proper operation. Keep the
remote from direct sunlight or any source that generates
heat, keep clean and dry. Change batteries frequently.
Note:
For detailed explanation of the functions, refer to the
“Other Controls” section of this manual for your model.
Button Identication
e function and operation of each button will be
explained later in this manual under Product Functions.
1. On/O button
2. Mode, press to select desired operation
3. Decrease temperature
4. Increase temperature
5. Fan, press to select fan speed
6. Swing angle button (up & down)
7. Health/Save button, not available on all models
8. Swing angle button (le & right)
9. X-Fan button
10. Temperature Display
11. Timer Button
12. Turbo Fan Button
13. Sleep Button
14. Light Button
Press “mode” and “-” buttons to switch between
Fahrenheit & Centigrade
Press “-” & “+” to lock control
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Page 23
Display Icons
15. Mode icons
16. Lock icon
17. Light icon
18. Sleep icon
19. Temperature icon
20. Up & down swing icon
21. Le & right swing icon
22. Set time icon
23. Digital display
24. Fan speed icon
Remote Control Operation
Replacing Batteries:
1. Locate the battery cover on the back of the remote.
2. Slide the cover downward.
3. Make sketch of battery polarities, then replace with
two “AAA” batteries.
4. Replace cover.
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Product Introduction
Remote Control Functions
1)On/O
e on-o state will change with each button press.
2) Mode Setting
Each time you press this button, a mode is selected in a sequence that goes from AUTO,
COOL, DRY, FAN,and HEAT
Aer energization, AUTO mode is defaulted. In AUTO mode, the set temperature will not
be displayed on the LCD, and the unit will automatically select the suitable operation
mode in accordance with the room temperature to make indoor room comfortable.
3)”-” Button
Press this button to decrease set temperature. Hold it down for above 2 seconds to
rapidly decrease set temperature. In AUTO mode, set temperature is not adjustable.
4)”+” Button
Press this button to increase set temperature. Hold it down for above 2 seconds to
rapidly increase set temperature. In AUTO mode, set temperature is not adjustable.
5) Fan
is button is used for setting fan speed in the sequence that goes from AUTO, low, medium, high, then back to
auto.
6) Up & Down Swing
Press button to start or stop up & down swing function. e remote controller defaults to simple swing
condition. Press + button and button at the same time at unit OFF to switch between simple swing and
static swing; blinks for 2 seconds. In static swing condition, pressing
louver positions. If the unit is turned o during swing operation,the louver will stop at present position.
button, the swing angle up & down
7) Health Save
Press HEALTH part of this button to turn on or o HEALTH function.(only for some model)
Pressing SAVE this button, SE is displayed and the unit goes into SAVE operation mode. Press SAVE button
again to cancel SAVE function. During SAVE operation , the temperature and fan speed is not adjustable.
8) Le & Right Swing
Press button to start or stop le & right swing function. e remote controller defaults to a simple swing
position.
Press + button and button at the same time at unit OFF to switch between simple swing and static swing;
blinks for two seconds
In static swing position, pressing button the swing angle will change positions.
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Page 25
Product Introduction
Remote Control Functions
9) X-Fan
Allows fan to run aer cooling cycle to dry o the coil and inhibit the growth of bacteria and mildew. Works
with “Auto” mode.
10)Temp Button
Toggles the display between set temperature, indoor temperature and outdoor temperature.
11) Timer On Button
Press TIMER button at unit ON to set TIMER OFF; HOUR OFF blinks. Press TIMER button at unite OFF to set
TIMER ON; HOUR ON blinks. In this case, pressing + or - button changes time setting. Holding down either
button rapidly changes time setting (time setting range 0.5 - 24 hours). Press TIMER button again to conrm
setting; HOUR ON/OFF stops blinking. If there is not any operation of button within 5 seconds during HOUR
ON/OFF blinking, TIMER setting will be canceled.
12) Turbo Button
Boost the cooling or heating airow, allowing the unit to reach the preset temperature in the shortest amount of
time.
13) Sleep Button
Press this button to go into the SLEEP operation mode. Press it again to cancel this
function. is function is available in COOL , HEAT (Only for models with heating
function) or DRY mode to maintain the most comfortable temperature for you.
14) Light Button
Turns the light on the indoor display on and o.
15) Combination of “+” and “-” Buttons
Press “+” and “-” buttons simultaneously to lock or unlock the keypad
16) Combination of “Mode” and “-” Buttons
Press “Mode” and “-” buttons simultaneously will switch between Fahrenheit and Centigrade.
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Page 26
Refrigerant Lines Connection, Evacuating and Charging
Refrigerant Lines Preparation &
Connection
The refrigerant lines should be kept sealed until ready to be
connected. Follow the following steps to ensure a quality leak
proof installation:
Step 1. Refrigerant Line Connection
Carefully bend and cut the tubing to prepare for aring. Use a
aring tool designed for R410a, following the recommended
manufacturer’s procedure. Tighten the are nut to the
indicated torque by using a spanner wrench and a toque
wrench. Connect the indoor unit rst, then the outdoor unit.
Use the 3/8” to 1/2” are adapter if needed.
Note:
Over tightening are nuts may damage are connections and
may cause leaks.
Tubing Size Torque (foot-pounds) Torque (inch-pounds)
1/4” 10-13 124-159
3/8” 25-31 301-372
1/2” 36-45 434-540
5/8” 50-60 602-726
Step 2. System Leak Check
Refrigerant lines should be pressurized prior to evacuating
system to check for leaks.
Use only dry nitrogen with a pressure regulator for
pressurizing unit. Pressurize with 150 psi of dry nitrogen.
Apply soap and water to check whether the joints are leaky. A
leak detector may also be used for a leakage test.
Hint:
You may want to perform leak testing and evacuation before
wiring to save time, electrical connections can be completed
while your vacuum pump is running.
Step 3. System Evacuation
Note: The outdoor unit contains a refrigerant charge, leave
liquid and gas valves closed.
1. After no leaks have been detected, connect a vacuum
pump to the outdoor unit.
2. Connect appropriate hoses to manifold gauge, vacuum
pump and unit refrigeration connections.
3. Evacuate the system until the micron gauge reads no
higher than 350 microns.
4. Close valve to vacuum pump; if pressure does not rise
above 500 microns after one minute, the evacuation
should be complete.
5. If it does rise, check for leaks and/or evacuate longer.
6. For refrigerant lines longer than 25 feet, refer to
installation instructions chart included with the unit
installation manual for additional charge.
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Page 27
Refrigerant Charging Procedure
Please refer to your units installation manual for proper charge. If your lineset exceeds the chart below for your
model, additional charge may be required. e charge must we weighed in with a refrigerant charging scale.
You can only add additional refrigerant to a new installation. If a low or high charge is suspected, you must
reclaim the refrigerant, then weigh in the correct amount per specications including any additional for long
linesets. It is important to check for leaks before adding refrigerant.
1. Determine addition refrigerant charge.
e RIO single zone units contain a factory charge adequate for up to a total length of refrigerant line as
indicated in the chart below. Additional refrigerant will need to be added for total lengths over the listed length.
Conrm the following chart with your installation manual for additional charge amounts:
RIO09HP115V
1A
Additional Charge 0.2 oz./. 0.2 oz./. 0.2 oz./. 0.2 oz./.
Max Length without
Additional Charge
Factory Charge
Max. Total Piping
Length
Max. Elevation
Additional Charge
Max Length without
Additional Charge
Factory Charge
Max. Total Piping
Length
Max. Elevation
25 . 25 . 25 . 25 .
35.3 oz. 35.3 oz. 26.1 oz. 35.3 oz.
49 . 66 . 50 . 50 .
33 . 33 . 33 . 33 .
RIO14HP230V1ARIO24HP230V
0.2 oz./. 0.22 oz./.
25 . 25 .
45.9 oz. 54.7 oz.
50 . 50 .
33 . 33 .
RIO12HP115V
1A
1A
RIO09HP230V
1A & 1B
RIO12HP230V
1A & 1B
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Refrigerant Charging Procedure
2. Leak Testing
Follow the procedures for leak testing with nitrogen
prior to adding charge on a new installation or existing
one suspected for leaks. See preceding page.
3. Attach hoses to the unit and vacuum pump
5/16” x 1/4” adapter may be required to connect hose
to port.
Check to insure that the liquid and gas valves are closed
on the unit. Close all valves on your gauge set, then
connect the vacuum pump to your gauge set. Pump
down lineset and indoor unit. is step will be repeated
for all zones.
4. Zero charging scale
Place the refrigerant tank on the charging scale. Open
the tank valve, turn on the scale, then zero the scale.
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Refrigerant Charging Procedure, cont.
5. Begin adding additional refrigerant
Charging should be completed with the unit o (not
running) and through the liquid side with liquid
refrigerant. If there are no ports on the liquid side, use
the gas side port connection, charging with liquid.
Record the amount of additional charge for future
reference.
6. Charge to the correct weight
If the scale was zeroed with the refrigerant tank on the
scale, the amount added to the system will be a negative
amount since it was removed from the tank. Aer the
proper amount of refrigerant has been weighed in,
close the manifold valve.
7. Remove refrigerant tank
Close the tank valve, then carefully remove the hose
and adapter. Replace the charging port cap back on
the outdoor unit valves. On new installations, open all
liquid and vapor service valves.
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Page 30
Installation
Proper installation site is vital for correct and ecient operation of the unit. Avoid the following sites where:
• Strong heat sources, vapors, ammable gas or volatile liquids are emitted.
• High-frequency electro-magnetic waves are generated by radio equipment, welders and medical equipment.
• e air is contaminated with industrial vapors and oils.
• e air contains sulfurous gas such as in hot spring zones.
• Poor air quality exists.
Indoor Unit
Outdoor Unit
e air inlet and outlet should be away from any
obstructions. Ensure the air will easily circulate through
the entire room.
1. Select a site where the condensate can be easily routed
or consider a condensate removal pump.
2. Select a place where it is out of reach of children.
3. Select a place that has adequate mounting structure,
strong enough to withstand the full weight and
vibration of the unit.
4. Be sure to leave enough space to allow access for
routine maintenance. Refer to unit installation
specications for clearances. Select a place more than
3 feet away from any TV or other electrical appliances
1. Select a suitable site where proper drainage will occur.
2. Select a site where there is sucient ventilation.
3. Select a site where there is no obstruction blocking the
inlet and outlet.
4. e site should be able to withstand the full weight of
the unit.
5. Try to limit expose to direct sunlight or strong winds.
6. Make sure that the outdoor unit is installed in
accordance with the installations instructions, and is
convenient for maintenance and repair.
7. Refer to your outdoor unit installation manual for
maximum lineset lengths and heights. is could be a
factor in determining outdoor location.
8. Select a place where it is out of reach of children.
9. Install Heat Pump legs to allow for proper drainage.
10. Install drain tting in bottom of outdoor unit
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Page 31
Mounting Plate Installation
Locate and Drill Hole
Installation
1. e mounting plate should be installed horizontally
and level.
2. Measure the center of the indoor unit. Please note, that
depending on model, the center of the bracket may not
correspond with the center of the unit.
3. Attach the mounting plate on the wall with screws.
4. Be sure that the mounting plate has been attached
rmly enough to withstand approximately 132
pounds.
5. Refer to specic models for dimensional data.
1. e piping can exit the indoor unit from either side,
see pictured below.
2. Drill a 2-1/2” diameter hole at a slightly downward
angle to the outdoor side.
3. Note: e outdoor hole should be approximately 1/4”
lower than the indoor hole.
4. Insert the piping-hole sleeve into the hole to prevent
the piping and wiring from being damaged when
passing through the hole.
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Page 32
Install Drain Hose
Install Line Set
Installation
1. Connect the drain hose to the outlet pipe of the indoor
unit using appropriate connections.
2. Insulate the condensate to prevent condensation.
3. Fasten the condensate, lineset and wring together to
prevent damage and movement. Slant the drain hose
downward for smooth drainage.
1. Install lineset and wiring from the outside through the
wall sleeve.
2. Bend the indoor lineset. Note: a tube bender will speed
up the process.
3. Carefully remove are nut from indoor coil. Listen
for holding charge from indoor unit. No charge may
indicate a leak and should be tested.
4. Use a aring tool if necessary to create the are,
connect tubing tightening to the torque listed below.
Tubing Size Torque (foot-pounds) Torque (inch-pounds)
1/4” 10-13 124-159
3/8” 25-31 301-372
1/2” 36-45 434-540
5/8” 50-60 602-726
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Page 33
Pressure and Leak Test
Installation
1. Use only dry nitrogen with a pressure regulator for
pressurizing unit. Pressurize with 150 psi of dry
nitrogen.
2. Apply soap and water to check whether the joints are
leaky. A leak detector can also be applied for a leakage
test.
Hint: You may want to perform leak testing and evacuation
before wiring to save time, electrical connections can be
completed while your vacuum pump is running.
Evacuating the System
Note: e outdoor unit contains a refrigerant charge, leave
liquid and gas valves closed.
1. Aer no leaks have been detected, connect a vacuum
pump to the outdoor unit.
2. Connect appropriate hoses to manifold gauge, vacuum
pump and unit refrigeration connections.
3. Evacuate the system until the micron gauge reads no
higher than 350 microns.
4. Close valve to vacuum pump; if pressure does not rise
above 500 microns aer one minute, the evacuation
should be complete.
5. If it does rise, check for leaks and/or evacuate longer.
6. For refrigerant lines longer than 25 feet, refer to
installation instructions chart included with the unit
installation manual for additional charge.
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Page 34
Connect the Outdoor Wiring
115 volt unit
shown
Installation
115 Volt unit
1. Remove the handle on the right side plate of the
outdoor unit.
2. Connect wiring from indoor unit to 1,2,3 &
ground, being careful to match color code of indoor
connections. Repeat this for each indoor unit.
3. Connect power wiring form outdoor disconnect to N,
L and ground.
4. Check all connections to tightness.
5. Reinstall the cover/handle.
Note: Follow all local electrical codes for electrical wiring.
240 Volt unit
1. Remove the handle on the right side plate of the
outdoor unit.
2. Connect wiring from indoor unit to 1,2,3 &
ground, being careful to match color code of indoor
connections. Repeat this for each indoor unit.
3. Connect power wiring form outdoor disconnect to L1,
L2 and ground.
4. Check all connections to tightness.
5. Reinstall the cover/handle.
Note: Follow all local electrical codes for electrical wiring.
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Page 35
Filter Maintenance and Emergency Operation
Cleaning Air Filter
1. Li open the front panel as shown on the picture
2. e rst stage lter can be cleaned with a
vacuum cleaner or by washing with a mild soap
and < 113º F water.
3. e 2nd lter can be washed, use a vacuum
cleaner to clean any dust, lint, etc.
4. roughly dry lters before replacing in unit.
1st Stage Filter
Removable 2nd Stage Filter
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Page 36
9K, 12K 115V
Symbol Color Symbol Symbol Color Symbol
WH White BN Brown
UE Ye l low BU Blue
RD Red BK Black
YEGN Yellow/Green Protective Earth
Electrical Schematics
Indoor Board
ese circuit diagrams are subject to change without notice, please refer to the one supplied with the unit.
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Page 37
9K, 12K 115V
Symbol Parts Name Symbol Parts Name
N L Neutral Wire, 110v Live Wire WH White
4YV 4-Way Valve YE Yell o w
EKV Electric Expansion Valve RD Red
L Reactor BN Brown
COMP Compressor BU Blue
SAT Overload YEGN Yellow/Green
Electrical Schematics
Outdoor Unit
Protective Earth BK Black
ese circuit diagrams are subject to change without notice, please refer to the one supplied with the unit.
37
Page 38
9K, 12K 230V
Electrical Schematics
Indoor Board
9 & 12k
ese circuit diagrams are subject to change without notice, please refer to the one supplied with the unit.
38
Page 39
9K, 12K 230V
Outdoor Unit
Electrical Schematics
ese circuit diagrams are subject to change without notice, please refer to the one supplied with the unit.
39
Page 40
18K
Indoor Unit
Electrical Schematics
ese circuit diagrams are subject to change without notice, please refer to the one supplied with the unit.
40
Page 41
24K
Indoor Unit
Electrical Schematics
41
Page 42
24K
Indoor Unit
Electrical Schematics
42
Page 43
18K, 24K
Electrical Schematics
ese circuit diagrams are subject to change without notice, please refer to the one supplied with the unit.
43
Page 44
18K, 24K
Electrical Schematics
ese circuit diagrams are subject to change without notice, please refer to the one supplied with the unit.
44
Page 45
AP-1 Circuit Board
Compressor
Heater Band
N2 - Voltage
Terminal
4-Way Valve
Printed Circuit Boards
Compressor Wires
ermistor wires
45
Page 46
Troubleshooting Indoor Components
Indoor Fan Motor Troubleshooting
To check the condition of the indoor fan motor voltage measurements
and resistance measurements can be compared to the following charts.
Care must be taken when checking voltage measurements, all wires and
terminals must be isolated for safety. Resistance measurements must be
taken with power o and “PG” connector removed from the circuit board.
e following chart indicates approximate voltage measurements, readings may vary slightly depending on
models and should be used as a reference only. Voltages should be taken with unit running.
PG Wire Connector Low Medium High Turbo
Brown - White 130 vac 147 vac 161 vac 225 vac
Brown - Red 148 vac 184 vac 210 vac 340 vac
White - Red 123 vac 150 vac 180 vac 205 vac
e following chart indicates approximate resistance measurements, readings may vary slightly depending on
models and should be used as a reference only. Turn power o and remove connector from circuit board before
reading measurements.
PG Wire Connector Resistance (ohms)
Brown - White 97 Ω
Brown - Red 174 Ω
White - Red 78 Ω
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Page 47
Troubleshooting Indoor Components
Step Motor Troubleshooting
To check the condition of the indoor step (swing) motor resistance measurements may be
compared to the following chart. Resistance measurements must be taken with power o and
the connector removed from the board. e following charts indicate approximate readings
and may vary with dierent models. Turn power o and remove connector from circuit board.
Connector Blue Pink Yel l ow Orange Red
Blue 397 Ω 402 Ω 400 Ω 198 Ω
Pink 400 Ω 402 Ω 198 Ω
Yell o w 402 Ω 198 Ω
Orange 198 Ω
Red
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Page 48
Troubleshooting Outdoor Components
EEV Troubleshooting
Cooling Mode
Input
To check the operation of the EEV Valve in cooling
mode, using a digital thermometer record the
temperature of the input line and the output line
of the valve as indicated in the picture above.
With the compressor running, the input side of
the valve should have a higher reading then the
output side indicating that the valve is metering.
If the temperature readings are the same, the
valve is fully open and the valve is not metering.
Since the pressures and frequency are controlled by
the G10 technology of the outdoor circuit board,
there are no pressure checks that can be made.
Heating Mode
Output
InputOutput
To check the operation of the EEV Valve in heating
mode, using a digital thermometer record the
temperature of the input line and the output line
of the valve as indicated in the picture above.
With the compressor running, the input side of
the valve should have a higher reading then the
output side indicating that the valve is metering.
If the temperature readings are the same, the valve
is fully open and the valve is not metering. Since
the pressures and frequency are controlled by
the G10 technology of the outdoor circuit board,
there are no pressure checks that can be made.
Resistance readings of EEV valve with wire plug disconnected from circuit board. Power to unit should be o
when making resistance readings. Readings below are approximate values and may vary slightly with dierent
outdoor models.
EEV Ω Orange Red Yel lo w Black Blue
Orange 94.6 Ω 94.8 Ω 94.4 Ω 47.0 Ω
Red 94.7 Ω 94.4 Ω 47.5 Ω
Yell o w 94.6 Ω 47.7 Ω
Black 47.4 Ω
Blue
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Page 49
Troubleshooting Outdoor Components
4-Way Valve Troubleshooting
Cooling Mode
To Accumulator
To Condenser
Suction Line
Compressor
Discharge
Checking the 4-way valve in cooling mode requires
the measurement of 4 readings. First record the
temperature of the compressor discharge tubing,
secondly record the temperature of the tubing going
to the condenser. ere should be no more than a
10 degrees dierence between the two readings.
Coil
Heating Mode
To Accumulator
To Condenser
Suction Line
Compressor
Discharge
Checking the 4-way valve in heating mode requires
the measurement of 4 readings. First record the
temperature of the compressor discharge tubing,
secondly record the temperature of the suction
line tube. ere should be no more than a 10
degrees dierence between the two readings.
Coil
e next set of readings will require recording the
temperature of the tubing going to the suction
line and the temperature of the tubing going to
the accumulator. Again, if there should be less
than 10 degrees dierence between these readings.
A temperature reading higher than 10 degrees
may indicate a leaky valve (not fully shied) or a
blockage in the valve.
4-Way valve solenoid resistance check:
Be sure all power is o to the unit. Remove the plug connecting the 4-way vale to the circuit board. Check the
resistance with an ohmmeter. e reading should indicate 1.8k Ω. If the reading is infinite, replace the solenoid
coil.
e next set of readings will require recording the
temperature of the tubing going to the condenser
coil and the temperature of the tubing going to
the accumulator. Again, if there should be less
than 10 degrees dierence between these readings.
A temperature reading higher than 10 degrees
may indicate a leaky valve (not fully shied) or a
blockage in the valve.
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Page 50
Troubleshooting Outdoor Components
Temperature Sensor Check
Temperature
Sensor
Using a glass of ice water, place the sensor into the glass with a digital thermometer. Wait a few minutes for the
reading to stabilize. Compare the readings to the sensor tables in Appendix “A”, it the reading are not comparable,
replace the sensor. When replacing the sensor, be sure to fasten the sensor securely if it is attached to a tube.
Temp
(ºC)
0 32.0 49.02 52 125.6 4.986 104 219.2 0.898
1 33.8 46.6 53 127.4 4.802 105 221.0 0.873
2 35.6 44.31 54 129.2 4.625 106 222.8 0.848
3 37.4 42.14 55 131.0 4.456 107 224.6 0.825
4 39.2 40.09 56 132.8 4.294 108 226.4 0.802
5 41.0 38.15 57 134.6 4.139 109 228.2 0.779
6 42.8 36.32 58 136.4 3.99 110 230.0 0.758
7 44.6 34.58 59 138.2 3.848 111 231.8 0.737
8 46.4 32.94 60 140.0 3.711 112 233.6 0.717
9 48.2 31.38 61 141.8 3.579 113 235.4 0.697
Temp
(ºF)
Resistance
(k)
Temp
(ºC)
Temp
(ºF)
Resistance
(k)
Temp
(ºC)
Temp
(ºF)
Resistance
(k)
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Page 51
Troubleshooting Outdoor Components
Compressor Windings
Red, Yellow & Blue Wires
Compressor Winding Resistance Check:
Compressor Windings
Slightly depress tab for
easy removal
Remove the compressor wires from the AP1 circuit board. e wires red to yellow, yellow to blue & red to
blue should have readings from 2 - 4 ohms. ere should be no reading from any wire to chassis ground. If the
readings between the windings dier greatly, the windings are bad. If there is a reading from any wire to the
chassis, there is leakage in the windings.
Reactor
e reactor lters out electrical noise and transient voltage spikes to the control board. ere will be a reading of
less than 1 Ω after the wires are removed. There should be no reading from either reactor terminal to ground.
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Page 52
Troubleshooting Outdoor Components
Outdoor Fan Motor
Outdoor Motor Winding Resistance Check:
Disconnect power to the unit, all reading are made with no power and fan motor wires disconnected from
circuit board.
e chart below will indicate the approximate resistance values in ohms. is motor is a brush-less DC motor,
readings may vary slightly for dierent models. Plugging a known good motor in the board would provide a
quick troubleshooting technique.
Motor Leads Red Yell ow White
Red 75 Ω 74 Ω
Yell o w 75 Ω 74 Ω
White 74 Ω 74 Ω
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Page 53
Troubleshooting Outdoor Components
Compressor Crankcase Heater Check
Compressor Crankcase Heater Resistance Check:
Unplug the wire connector from the circuit board. e resistance should read approximately 2.15K ohms. ere
should be no reading from either wire to ground. If readings vary from these measurements, replace the heater.
Refrigerant Temperature Sensors
ese sensors are a negative coecient thermistor that decrease in resistance as the temperature increases. e
sensors are used to monitor the temperature of the refrigerant. Please refer to the troubleshooting section for
error codes generated by a sensor fault. Temperature sensors and locations will vary depending on models.
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Page 54
Troubleshooting Outdoor Components
Liquid Line Temperature Sensors
ese sensors are a negative coecient thermistor that decrease in resistance as the temperature increases. e
sensors are used to monitor the temperature of the refrigerant leaving the EEV to maintain a correct superheat
operation. Please refer to the troubleshooting section for error codes generated by a sensor fault. Temperature
sensors and locations will vary depending on models.
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Page 55
Troubleshooting Outdoor Components
Exhaust Temperature Sensor
e exhaust temperature sensor monitors the refrigerant discharge temperature and will send information to the
inverter control board for system operation.
e following actions can occur:
Exhaust Temperature > 208 F - Compressor will not rise above present level
Exhaust Temperature > 217 F - Compressor will run at reduced frequency
Exhaust Temperature < 194 F - Compressor o for 3 minutes minimum, the compressor will restart
Error Code F5 will be generated if the sensor is open or shorted. Please refer to the troubleshooting section for
more detailed information.
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Page 56
Troubleshooting Outdoor Components
Outdoor Temperature Sensor
is sensor is a negative coecient thermistor that will decrease in resistance as the temperature increases. is
sensor will monitor the temperature of the outdoor air. e reading will be used by the inverter board to adjust
frequency calculations.
Error Code F3 will be generated if the sensor is open or shorted. Please refer to the troubleshooting section for
more detailed information.
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Fault Displays
Troubleshooting Faults
Observe all electrical precautions during service of indoor and outdoor units. During Static service (serving nit
without power applied), wait 10 minutes before service units.
During dynamic service (servicing while unit is energized), be sure unit is properly grounded.
Troubleshooting procedure:
1. Conrmation
2. Judgment of ashing LED of Indoor/Outdoor unit
3. Check the part associated with the fault code.
Precautions:
A large capacity electrolytic capacitor is used in the outdoor unit controller (inverter). Capacitor should be
discharged before attempting to work on board. Electrical shock hazard will be present even aer unit is
disconnecte3d from power source.
Conrmation:
Conrm that the unit has proper voltage within 10% of rated value.
Observe ashing LED of indoor/outdoor unit for diagnostic information.
4 Minutes aer protection stop of motor, the malfunction error code is shown. In other situations, the
malfunction will be displayed by pressing the light button for 6 times within 4 seconds.
57
Page 58
No.
Malfuntiuon
Name
Fault Displays
9,000 and 12,000 btuh units
Display Method of Indoor Unit Display Method of Outdoor Unit
Indicator has 3 kinds of display
status and during blinking, ON
0.5ws and OFF 0.5s
Yellow
Indicator
Red
Indicator
Dual-8
Code
Display
Indicator Display (during
blinking, ON 0.5s and OFF 0.5s)
Operation
Indicator
Cool
Indicator
Heating
Indicator
A/C Status Possible Causes
Green
Indicator
1 High pressure
protection of
system
2 Antifreezing
protection
3 System block
or refrigerant
leakage
4 High discharge
temperature
protection of
compressor
E1 OFF 3s
and blink
once
E2 OFF 3S
and blink
twice
E3 OFF 3S
and blink
3 times
E4 OFF 3S
and blink
4 times
OFF
3S and
blink 3
times
OFF
3S and
blink 7
times
OFF
3S and
blink 9
times
During cooling and
drying operation, except
indoor fan operates, all
loads stop operation.
During heating
operation, the complete
unit stops.
During cooling and
drying operation,
comporessor and
outdoor fan stop while
indoor fan operates.
e Dual-8 Code
Display will show E3
until the low pressure
switch stop operation.
During cooling and
drying operation,
compressor and outdoor
fan stop while indoor
fan operates. During
heatin operation, all
loads stop
Possible reasons:
1. Refrigerant was
superabundant; 2.
Poor heat exchange
(including lth blockage
of heat exchanger
and bad radiating
environment); Ambient
temperature is too high.
1. Poor air-return in
indoor unit; 2. Fan
speed is abnormal; 3.
Evaporator is dirty
1. Low-pressure
protection; 2. Low
pressure protection
of system; 3. Low
pressure protection of
compressor
Please refer to the
malfunction analysis
(discharge protection,
overload).
5 Overcurrent
protection
E5 OFF 3S
and blink
5 times
58
OFF
3S and
blink 5
times
During cooling and
drying operation,
compressor and outdoor
fan stop while indoor
fan operates. During
heatin operation, all
loads stop
1. Supply voltage is
unstable; 2. Supply
voltage is too low and
load is too high; 3.
Evaporator is dirty.
Page 59
No.
Malfuntiuon
Name
Fault Displays
9,000 and 12,000 btuh units
Display Method of Indoor Unit Display Method of Outdoor Unit
Indicator has 3 kinds of display
status and during blinking, ON
0.5ws and OFF 0.5s
Yellow
Indicator
Red
Indicator
Dual-8
Code
Display
Indicator Display (during
blinking, ON 0.5s and OFF 0.5s)
Operation
Indicator
Cool
Indicator
Heating
Indicator
A/C Status Possible Causes
Green
Indicator
7 High
temperature
resistant
protection
8 EEPROM
malfunction
9 Limit/decrease
frequency
due to high
temperature of
module
10 Malfunction
protection of
jumper cap
11 Gathering
refrigerant
E8 OFF 3S
and blink
8 times
EE OFF
3S and
blink 15
times
EU OFF
3S and
blink 6
times
OFF
3S and
blink 6
times
C5 OFF 3S
and blink
15 times
F0 OFF 3S
and blink
1 time
OFF
3S and
blink 1
time
OFF
3S and
blink 6
times
OFF
3S and
blink 11
times
During cooling and
drying operation,
compressor and outdoor
fan stop while indoor
fan operates. During
heatin operation, all
loads stop
During cooling and
drying operation,
compressor and outdoor
fan stop while indoor
fan operates. During
heatin operation, all
loads stop
All loads operate
normally, while
operation frequency for
compressor is decreased
Wireless remote
receiver and button
are eective, but can
not dispose the related
command
When the outdoor
unit receive signal of
Gathering refrigerant,
the system will be
forced to run under
cooling mode for
gathering refrigerant
Refer to the malfunction
analysis (overload, high
temperature resistant).
Replace outdoor control
panel AP1
Discharging aer
the complete unit is
de-energized for 20
mins, check whether
the thermal grease on
IPM module of outdoor
control panel AP1 is
sucient and whether
the radiateor is inserted
tightly. If its no use,
please replace control
panel AP1.
1. No jumper cap
insert on mainboard;
2. Incorrect insert of
jumper cap; 3. Jumper
cap damaged; 4.
Abnormal detecting
circuit of mainboard.
Nominal cooling mode
59
Page 60
No.
Malfuntiuon
Name
Fault Displays
9,000 and 12,000 btuh units
Display Method of Indoor Unit Display Method of Outdoor Unit
Indicator has 3 kinds of display
status and during blinking, ON
0.5ws and OFF 0.5s
Yellow
Indicator
Red
Indicator
Dual-8
Code
Display
Indicator Display (during
blinking, ON 0.5s and OFF 0.5s)
Operation
Indicator
Cool
Indicator
Heating
Indicator
A/C Status Possible Causes
Green
Indicator
12 Indoor
ambient
temperature
sensor is open/
short circuited
13 Indoor
evaporator
temperature
sensor is open/
short circuited
14 Outdoor
ambient
temperature
sensor is open/
short circuited
15 Outdoor
condenser
temperature
sensor is open/
short circuited
F1 OFF
3S and
blink 1
time
F2 OFF
3S and
blink
twice
F3 OFF
3S and
blink 3
times
F4 OFF
3S and
blink 4
times
OFF
3S and
blink 6
times
OFF
3S and
blink 5
times
During cooling and
drying operation,
indoor unit operates
while other loads will
stop; during heating
operation, the complete
unit will stop operation
AC stops operation
once reaches the setting
temperature. Cooling,
drying: internal fan
motor stops operation
while other loads stop
operation; heating: AC
stop operation
During cooling and
drying operating,
compressor stops while
indoor fan operates;
During heating
operation, the complete
unit will stop operation
During cooling and
drying operating,
compressor stops while
indoor fan operates;
During heating
operation, the complete
unit will stop operation
1. Loosening or
bad contact of
indoor ambient
temp sensor and
mainboard terminal;
2. Components in
mainboard fell down
leads short circuit; 3.
Indoor ambient temp
sensor damaged (check
with sensor resistance
value chart); 4.
Mainboard damaged.
1. Loosening or
bad contact of
indoor evaporator
temp sensor and
mainboard terminal;
2. Components on the
mainboard fall down
leads short cirtui; 3.
Indoor evaporator temp
sensor damaged (check
temp sensor value
chart for testing) 4.
Mainboard damaged
Outdoor temperature
sensor hasn’t been
connected well is
damaged. Please check
it by referring to the
resistance table for
temperature sensor
Outdoor temperature
sensor hasn’t been
connected well or is
damaged. Please check
it by referring to the
resistance table for
temperature sensor
60
Page 61
No.
Malfuntiuon
Name
Fault Displays
9,000 and 12,000 btuh units
Display Method of Indoor Unit Display Method of Outdoor Unit
Indicator has 3 kinds of display
status and during blinking, ON
0.5ws and OFF 0.5s
Yellow
Indicator
Red
Indicator
Dual-8
Code
Display
Indicator Display (during
blinking, ON 0.5s and OFF 0.5s)
Operation
Indicator
Cool
Indicator
Heating
Indicator
A/C Status Possible Causes
Green
Indicator
16 Outdoor
discharge
temperature
sensor is open/
short circuited
17 Limit/decrease
frequency due
to overload
18 Decrease
frequency due
to overcurrent
19 Decrease
frequency due
to high air
discharge
20 Limit/decrease
frequency due
to antifreezing
21 Voltage for DC
bus-bar is too
high
F5 OFF
3S and
blink 5
times
F6 OFF
3S and
blink
6times
F8 OFF
3S and
blink
8times
F9 OFF
3S and
blink 9
times
FH OFF
3S and
blink 2
times
PH OFF
3S and
blink 11
times
OFF
3S and
blink 2
times
OFF
3S and
blink 7
times
OFF
3S and
blink 3
times
OFF
3S and
blink 1
time
OFF
3S and
blink 13
times
OFF
3S and
blink
twice
OFF
3S and
blink 4
times
During cooling and
drying operation,
compressor will stop
aer operating for about
3 mins, while indoor
fan will operate; During
heating operation, the
complete unit will stop
aer operating for about
3 mins
All loads operate
normally, while
operation frequency for
compressor is decreased
All loads operate
normally, while
operation frequency for
compressor is decreased
All loads operate
normally, while
operation frequency for
compressor is decreased
All loads operate
normally, while
operation frequency for
compressor is decreased
During cooling and
drying operation,
compressor will stop
while indoor fan will
operate; During heating
operation, the complete
unit will stop operation.
1. Outdoor temperature
sensor hasn’t been
connected well or is
damaged. Please check
it by referring to the
resistance table for
temperature sensor;
2. e head head of
temperature sensor
hasn’t been inserted into
the copper tube
Refer to the malfunction
analysis (overload, high
temperature resistant)
e input supply voltage
is too low; System
pressure is too high and
overload
Overload or
temperature is too
high; Refrigerant is
insucient; Malfunction
of electric expansion
valve (EKV)
Poor air-return in
indoor unit or fan speed
is too low
1. Measure the voltage
of position L and N on
wiring board (XT), if
the voltage is higher
than 265VAC, turn on
the unit aer the supply
voltage is increased to
the normal range; 2. If
the AC input is normal,
measure the voltage of
electrolytic capacitor C
on control panel (AP1),
if its normal, theres
malfunction for the
circuit, please replace
the control panel (AP1)
61
Page 62
No.
Malfuntiuon
Name
Fault Displays
9,000 and 12,000 btuh units
Display Method of Indoor Unit Display Method of Outdoor Unit
Indicator has 3 kinds of display
status and during blinking, ON
0.5ws and OFF 0.5s
Yellow
Indicator
Red
Indicator
Dual-8
Code
Display
Indicator Display (during
blinking, ON 0.5s and OFF 0.5s)
Operation
Indicator
Cool
Indicator
Heating
Indicator
A/C Status Possible Causes
Green
Indicator
22 Voltage of DC
bus-bar is too
low
23 Compressor
Min frequence
in test state
24 Compressor
rated frequence
in test state
25 Compressor
maximum
frequence in
test state
26 Compressor
intermediate
frequence in
test state
27 Overcurrent
protection of
phase current
for compressor
28 Charging
malfunction of
capacitor
PL OFF
3S and
blink 21
times
OFF
3S and
blink 12
times
During cooling and
drying operation,
compressor will stop
while indoor fan
operate; During heating
operation, the complete
unit will stop
1. Measure the voltage
of position L and N on
wiring board (XT), if
the voltage is higher
than 265VAC, turn on
the unit aer the supply
voltage is increased to
the normal range; 2. If
the AC input is normal,
measure the voltage of
electrolytic capacitor C
on control panel (AP1),
if its normal, theres
malfunction for the
circuit, please replace
the control panel (AP1)
P0 (during (during Showing durin min
cooling or min heating
test
P1 (during (during Showing during
nominal cooling or
nominal heating test
P2 (during (during Showing during max
cooling or max heating
test
P3 (during (during Showing during middle
cooling or middle
heating test
P5 OFF
3S and
blink 15
times
PU OFF
3S and
blink 17
times
During cooling and
drying operation,
compressor will stop
while indoor fan
will operate; During
heating operationg, the
complete unit will stop
operation.
During cooling and
drying operation,
compressor will stop
while indoor fan will
Refer to the
malfunction analysis
(IPM protection,
loss of synchronism
preoteciton and
overcurrent protection
of phase current for
compressor
Refer to the part three
- charging malfunction
analysis of capacitor
operate; During heating
operationg the complete
unit will stop
62
Page 63
No.
Malfuntiuon
Name
Fault Displays
9,000 and 12,000 btuh units
Display Method of Indoor Unit Display Method of Outdoor Unit
Indicator has 3 kinds of display
status and during blinking, ON
0.5ws and OFF 0.5s
Yellow
Indicator
Red
Indicator
Dual-8
Code
Display
Indicator Display (during
blinking, ON 0.5s and OFF 0.5s)
Operation
Indicator
Cool
Indicator
Heating
Indicator
A/C Status Possible Causes
Green
Indicator
29 Malfunction
of module
temperature
sensor circuit
30 Module high
temperature
protection
31 Decrease
frequency
due to high
temperature
resistant
during heating
operation
32 Static
dedusting
protection
33 Overload
protection for
compressor
34 System is
abnormal
P7 OFF
3S and
blink 18
times
P8 OFF
3S and
blink 19
times
H0 OFF
3S and
blink 10
times
H2 OFF
3S and
blink
twice
H3 OFF
3S and
blink 3
times
H4 OFF
3S and
blink 4
times
OFF
3S and
blink 8
times
OFF
3S and
blink 6
times
During cooling and
drying operation,
compressor will stop
while indoor fan will
operate; During heating
operationg the complete
unit will stop
During cooling and
drying operation,
compressor will stop
while indoor fan will
operate; During heating
operationg the complete
unit will stop
All loads operate
normally, while
operation frequency for
compressor is decreased
During cooling and
drying operation,
compressor will stop
while indoor fan will
operate; During heating
operationg the complete
unit will stop
During cooling and
drying operation,
compressor will stop
while indoor fan will
operate; During heating
operation, the complete
unit will stop operation.
Replace outdoor control
panel AP1
Aer the complete unit
is de-energized for 20
mins, check whether
the thermal grease on
IPM Module of outdoor
control panel AP1 is
sucient and whether
the radiator is inserted
tightly. If its no use,
please replace control
panel AP1.
Refer to the malfunction
analysis (overload, high
temperature resistant)
1. Wiring terminal
OVC-COMP is
loosened. In normal
state, the resistance for
this terminal should
be less than 1ohm; 2.
Refer to the malfunction
analysis (discharge
protection, overload)
Refer to the malfunction
analysis (overload, high
temperature resistant)
63
Page 64
No.
Malfuntiuon
Name
Fault Displays
9,000 and 12,000 btuh units
Display Method of Indoor Unit Display Method of Outdoor Unit
Indicator has 3 kinds of display
status and during blinking, ON
0.5ws and OFF 0.5s
Yellow
Indicator
Red
Indicator
Dual-8
Code
Display
Indicator Display (during
blinking, ON 0.5s and OFF 0.5s)
Operation
Indicator
Cool
Indicator
Heating
Indicator
A/C Status Possible Causes
Green
Indicator
35 IPM protection H5 OFF
3S and
blink 5
times
36 Module
temperature is
too high
H5 OFF
3S and
blink 5
times
37 Internal motor
(fan motor) do
not operate
H6 OFF 3S
and blink
11 times
38 H7 OFF
3S and
blink 7
times
39 PFC protection HC OFF
3S and
blink 6
times
40 Outdoor DC
fan motor
malfunction
L3 OFF 3S
and blink
23 times
OFF
3S and
blink 4
times
OFF
3S and
blink 10
times
OFF
3S and
blink 14
times
OFF
3S and
blink 14
times
During cooling and
drying operation,
compressor will stop
while indoor fan will
operate; During heating
operation, the complete
unit will stop operation.
Internal fan motor,
external fan motor,
compressor and electric
heater stop operationg,
guide louver stops and
present location.
During cooling and
drying operation,
compressor will
stop while indoor
fan operate; During
heating operationg, the
complete unit will stop
operation.
During cooling and
drying operation,
compressor will
stop while indoor
fan operate; During
heating operationg, the
complete unit will stop
operation.
Outdoor DC fan motor
malfunction lead
to compressor stop
operation.
Refer to the malfunction
analysis (IPM
protection, loss of
syncrhonism protection
and overcurrent
protection of phase
current for compressor.
1. Bad contact of
DC motor feedback
terminal; 2. Bad
contact of DC motor
control end; 3. Fan
motor is stalling; 4.
Motor malfunction;
5. Malfunction of
mainboard rev detecting
circuit
Refer to the malfunction
analysis (IPM
protection, loss of
syncrhonism protection
and overcurrent
protection of phase
current for compressor.
Refer to the malfunction
analysis (IPM
protection, loss of
syncrhonism protection
and overcurrent
protection of phase
current for compressor.
DC fan motor
malfunction or
system blocked or the
connector loosed
64
Page 65
No.
Malfuntiuon
Name
Fault Displays
9,000 and 12,000 btuh units
Display Method of Indoor Unit Display Method of Outdoor Unit
Indicator has 3 kinds of display
status and during blinking, ON
0.5ws and OFF 0.5s
Yellow
Indicator
Red
Indicator
Dual-8
Code
Display
Indicator Display (during
blinking, ON 0.5s and OFF 0.5s)
Operation
Indicator
Cool
Indicator
Heating
Indicator
A/C Status Possible Causes
Green
Indicator
41 Power
protection
L9 OFF 3S
and blink
20 times
42 Indoor unit
and outdoor
unit doesn't
LP OFF 3S
and blink
19 times
match
43 Failure start-up LC OFF
3S and
blink 11
times
44 Malfunction of
phase current
detection
circuit for
U1 OFF
3S and
blink 13
times
compressor
45 Malfunction
of voltage
dropping for
DC bus-bar
46 Malfunction
of complete
units current
detection
U3 OFF
3S and
blink 20
times
U5 OFF
3S and
blink 13
times
OFF
3S and
blink 9
times
OFF
3S and
blink 16
times
Compressor stop
operation and Outdoor
fan motor will stop 30S
later, 3 minutes later fan
motor and compressor
will restart
Compressor and
outdoor fan motor can't
work
During cooling and
drying operation,
compressor will
stop while indoor
fan operate; During
heating operationg, the
complete unit will stop
operation.
During cooling and
drying operation,
compressor will stop
while indoor fan will
operate; During heating
operation, the complete
unit will stop
During cooling and
drying operation,
compressor will stop
while indoor fan will
operate; During heating
operation, the complete
unit will stop
During cooling and
drying operation,
compressor will stop
while indoor fan will
operate; During heating
operation, the complete
unit will stop
To protect the
electronical components
when detect high power
Indoor unit and outdoor
unit doesn't match
Refer to the malfunction
analysis
Replace outdoor control
panel AP1
Supply voltage is
unstable
eres circuit
malfunction on outdoor
units control panel
AP1. Please replace the
outdoor unit control
panel AP1.
65
Page 66
No.
Malfuntiuon
Name
Fault Displays
9,000 and 12,000 btuh units
Display Method of Indoor Unit Display Method of Outdoor Unit
Indicator has 3 kinds of display
status and during blinking, ON
0.5ws and OFF 0.5s
Yellow
Indicator
Red
Indicator
Dual-8
Code
Display
Indicator Display (during
blinking, ON 0.5s and OFF 0.5s)
Operation
Indicator
Cool
Indicator
Heating
Indicator
A/C Status Possible Causes
Green
Indicator
47 e four-
way valve is
abnormal
U7 OFF
3S and
blink 20
times
48 Zero-crossing
malfunction of
outdoor unit
49 Frequency
limiting
(power)
U9 OFF 3S
and blink
18 times
OFF
3S and
blink 13
times
50 Compressor
running
OFF
3S and
blink
once
51 e
temperature
for turning
on the unit is
OFF
3S and
blink 8
times
reached
52 Frequency
limiting
(module
temperature)
OFF
3S and
blink 11
times
53 Normal OFF
0.5S and
blink
once
54 Defrosting OFF
3S and
blink
once
OFF
0.5S and
blink
twice
(during
If this malfunction
occurs during heating
operationg, the
complete unit will stop
operation
During cooling
operation, compressor
will stop while indoor
fan will operate; during
heating, the complete
unit will stop operation.
Defrosting will occur
in heating mode.
Compressor will operate
while indoor fan will
stop operation.
1. Supply voltage is
lower than AC175V; 2.
Wiring terminal 4V is
loosened or broken, 3.
4V is damaged, please
replace 4V
Replace outdoor control
panel AP1
It’s the normal state.
66
Page 67
Fault Displays
9,000 and 12,000 btuh units
If malfunction occurs, corresponding code will display and the unit will resume normal until protection or
malfunction disappears.
Indoor Display of
outdoor unit
Compressor starts (normal)
Defrosting (normal display of indoor unit)
Anti-freezing protection (normal disply of
indoor unit)
IPM Protection
Overcurrent Protection
Overload Protection
Exhaust Protection
Overload protection of compressor
Cooling (dehumidfy) or heating >= dropped
frequency current
Exhaust temp. >= dropped frequency
temperature
Yellow indicator blinks once
Yellow indicator blinks twice
Yellow indicator blinks 3 times
Yellow indicator blinks 4 times
Yellow indicator blinks 5 times
Yellow indicator blinks 6 times
Yellow indicator blinks 7 times
Yellow indicator blinks 8 times
Red indicator blinks once
Red indicator blinks twice
T
Outdoor condenser temp sensor malfunction
Outdoor ambient temp sensor malfunction
Outdoor exhaust temp sensor malfunction
Tube temp. >= dropped frequency
temperature
<= dropped frequency temperature
tube-in
Starting at temperature does not reach
Communication is not normal
Red indicator blinks 3 times
Red indicator blinks 4 times
Red indicator blinks 5 times
Red indicator blinks 6 times
Red indicator blinks 7 times
Red indicator blinks 8 times
Green indicator does not blink
67
Page 68
Malfunction
Name
High pressure
protection of
system
Anti-freezing
protection
High
discharge
temperature
protection of
compressor
Overcurrent
protection
Fault Displays
18,000 and 24,000 btuh units
Indoor Unit Displaying Method Outdoor Unit Display (LED)
Dual-8
Code
Display
D1
E2
D4
E5
Indicator Display (during
blinking, ON 0.5s and OFF 0.5s
Running
LED
OFF 3s
and blink
once
OFF 3s
and blink
twice
OFF 3s
and blink
4 times
OFF 3s
and blink
5 times
Cooling
LED
Heating
LED
Indicator has 3 kinds of display status and
during blinking, ON 0.5s and OFF 0.5s
D40/D5 D41/D6 D42/D16
o ¶ ¶ ¶
n o n o
n o n ¶
o n ¶ o
D43/
D30
A/C Status Malfunctions
During cooling
and drying
operation,
except indoor
fan operates,
all loads stop
operation.
During heating
operation the
complete stops
During cooling
and drying
operation,
compressor and
outdoor fan stop
while indoor fan
operates
During cooling
and drying
operation,
compressor and
outdoor fan stop
while indoor
fan operates.
During heating
operation, all
loads stop
During cooling
and drying
operation,
compressor and
outdoor fan stop
while indoor
fan operates.
During heating
operation, all
loads stop
Possible reasons:
1. Refrigerant was
superabundant;
2. Poor heat
exchange
(including lth
blockage of heat
exchanger and
bad radiating
environment);
Ambient
temperature is
too high.
1. Poor air return
in indoor unit,
2. Fan speed is
abnormal, 3.
Evaporator is
dirty
Please refer to
the malfunction
analysis
(discharge
protection
overload)
1. Supply voltage
is unstable, 2.
Supply voltage
is too low and
load is too high,
3. Evaporator is
dirty
o = OFF
n = Illuminated
¶ = Blink
68
Page 69
Malfunction
Name
Communication
Malfunction
Fault Displays
18,000 and 24,000 btuh units
Indoor Unit Displaying Method Outdoor Unit Display (LED)
Dual-8
Code
Display
E6
Indicator Display (during
blinking, ON 0.5s and OFF 0.5s
Running
LED
OFF 3s
and blink
6 times
Cooling
LED
Heating
LED
Indicator has 3 kinds of display status and
during blinking, ON 0.5s and OFF 0.5s
D40/D5 D41/D6 D42/D16 D43/D30
o o o ¶
A/C Status Malfunctions
During cooling
and drying
operation,
compressor
and outdoor
fan stop while
indoor fan
operates.
During heating
operation, all
loads stop
Refer to the
corresponding
malfunction
analysis
Circuit PG
motor (indoor
fan) has circuit
malfunction
by zero cross
detection
PG motor
(indoor fan
motor) does not
operate
High
temperature
resistant
protection
o = OFF
n = Illuminated
¶ = Blink
U8
H6
E8
OFF 3s
and blink
17 times
OFF 3s
and blink
11 times
OFF 3s
and blink
8 times
n o n n
Operation
of remote
controller or
control panel
is available, but
the unit wont
act
e complete
unit will stop
operation
During cooling
and drying
operation,
compressor
and outdoor
fan stop while
indoor fan
operates.
During heating
operation, all
loads stop
Control board
is damaged.
Poor
connection for
PGF in circuit
diagram,
Malfunction
of indoor
units control
panel AP1,
Malfunction
of indoor units
motor M1
Refer to the
corresponding
malfunction
analysis
69
Page 70
Malfunction
Name
Malfunction
protection of
jumper cap
Indoor
ambient
temperature
sensor is
open/short
circuit
Indoor
evaporator
temperature
sensor is
open/short
circuited
Outdoor
ambient
temperature
sensor is
open/short
circuited
Fault Displays
18,000 and 24,000 btuh units
Indoor Unit Displaying Method Outdoor Unit Display (LED)
Indicator has 3 kinds of display status
and during blinking, ON 0.5s and
OFF 0.5s
D40/D5D41/D6D42/
o o ¶ n
Dual-8
Code
Display
C5
F1
F2
F3
Indicator Display (during
blinking, ON 0.5s and OFF 0.5s
Running
LED
OFF 3s
and blink
15 times
Cooling
LED
OFF 3s
and blink
once
OFF 3s
and blink
twice
OFF 3s
and blink
3 times
Heating
LED
D16
D43/
D30
A/C Status Malfunctions
e complete
unit will stop
operation
During cooling
and drying
operation,
indoor unit
operates while
other loads
will stop
during heating
operation, the
complete unit
will stop
During cooling
and drying
operation,
indoor unit
will operate
while other
loads will stop;
During heating
operation,
the complete
unit will stop
operation
During cooling
and drying
operating,
compressor stops
while indoor
fan operates;
During heating
operation,
the complete
unit will stop
operation
Poor connection for
the jumper cap on
indoor units, control
panel AP1, please
reinsert or replace the
jumper cap
1. Room temperature
sensor hasn’t been
connected well with
indoor units control
panel AP1 (refer to
the wiring diagram for
indoor unit), 2. Room
temperature sensor
is damaged (please
refer to the resistance
table of temperature
sensor)
1. Room temperature
sensor hasn't been
connected well with
indoor units control
panel AP1 (refer to
the wiring diagram for
indoor unit) 2. Room
temperature sensor
is damaged (please
refer to the resistance
table of temperature
sensor)
Outdoor temperature
sensor hasn't been
connected well or
is damaged. Please
check it by referring
to the resistance table
for the temperature
sensor.
o = OFF
n = Illuminated
¶ = Blink
70
Page 71
Malfunction
Name
Outdoor
condenser
temperature
sensor is open/
short circuited
Fault Displays
18,000 and 24,000 btuh units
Indoor Unit Displaying Method Outdoor Unit Display (LED)
Indicator has 3 kinds of display
status and during blinking, ON 0.5s
and OFF 0.5s
D40/D5D41/D6D42/
D16
o o ¶ o
Dual-8
Code
Display
F4
Indicator Display (during
blinking, ON 0.5s and OFF 0.5s
Running
LED
Cooling
LED
OFF 3s
and blink
4 times
Heating
LED
D43/
D30
A/C Status Malfunctions
During cooling and
drying operating,
compressor stops
while indoor fan
operates; During
heating operation,
the complete unit
will stop operation
Outdoor
temperature
sensor hasn't been
connected well
or is damaged.
Please check it by
referring to the
resistance table for
the temperature
sensor.
Outdoor
condenser
temperature
sensor is open/
short circuited
Limit/decrease
frequency due to
overload
Decrease
frequency due to
overcurrent
F5
F6
F8
OFF 3s
and blink
5 times
OFF 3s
and blink
6 times
OFF 3s
and blink
8 times
o o ¶ ¶
n o ¶ ¶
n n o n
During cooling and
drying operation,
compressor will
stop aer operating
for about 3 mins,
while indoor fan
will operate; During
heating operation,
the complete unit
will stop aer
operating for about
3 mins
All loads operate
normally, while
operating frequency
for compressor is
decreased
All loads operate
normally, while
operating frequency
for compressor is
decreased
1. Outdoor
temperature
sensor hasn't been
connected well
or is damaged.
Please check it by
referring to the
resistance table
for temperature
sensor. 2. e head
of temperature
sensor hasn't been
inserted into the
copper tube
Refer to the
malfunction
analysis (overload,
high temperature
resistant)
e input supply
voltage is too low,
system pressure
is too high and
overload
o = OFF
n = Illuminated
¶ = Blink
71
Page 72
Malfunction
Name
Decrease
frequency
due to high
air discharge
Voltage for
DC bus-bar
is too high
Malfunction
of complete
units current
detection
Fault Displays
18,000 and 24,000 btuh units
Indoor Unit Displaying Method Outdoor Unit Display (LED)
Indicator has 3 kinds of display status
and during blinking, ON 0.5s and OFF
0.5s
D40/D5D41/D6D42/
D16
n n o o
o n o ¶
o n ¶ n
Dual-8
Code
Display
F9
PH
U5
Indicator Display (during
blinking, ON 0.5s and OFF 0.5s
Running
LED
Cooling
LED
OFF 3s
and blink
9 times
OFF 3s
and blink
11 times
OFF 3s
and blink
13 times
Heating
LED
D43/
D30
A/C Status Malfunctions
All loads operate
normally, while
operating frequency
for compressor is
decreased
During cooling and
drying operation,
compressor will stop
while indoor fan
will operate; During
heating operating
the complete unit
will stop operation
During cooling and
drying operating,
the compressor will
stop while indoor
fan will operate;
During heating
operation the
complete unit will
stop operating
Overload or
temperature is too
high, refrigerant
is insucient,
Malfunction of
electric expansion
valve (EEV)
1. Measure the
voltage of position
L and N on wiring
board (XT), if the
voltage is higher
than 265VAC,
turn on the unit
aer the supply
voltage is increased
to the normal
range. 2. If the AC
input is normal
measure the voltage
of electrolytic
capacitor C on
control panel
(AP1), if its normal,
theres malfunction
for the circuit,
please replace the
control panel (AP1)
eres circuit
malfunction on
outdoor units
control panel AP1,
please replace
the outdoor units
control panel AP1
o = OFF
n = Illuminated
¶ = Blink
72
Page 73
Malfunction
Name
Malfunction of
complete units
current detection
Fault Displays
18,000 and 24,000 btuh units
Indoor Unit Displaying Method Outdoor Unit Display (LED)
Indicator has 3 kinds of display
status and during blinking, ON
0.5s and OFF 0.5s
D40/D5D41/D6D42/
D16
o n ¶ n
Dual-8
Code
Display
U5
Indicator Display (during
blinking, ON 0.5s and OFF 0.5s
Running
LED
Cooling
LED
OFF 3s
and blink
13 times
Heating
LED
D43/
D30
During cooling and
drying operating,
the compressor will
stop while indoor fan
will operate; During
heating operation the
complete unit will
stop operating
A/C Status Malfunctions
eres circuit
malfunction on
outdoor units
control panel AP1,
please replace
the outdoor units
control panel AP1
Overcurrent
protection of
phase current for
compressor
Defrosting H1
Static dedusting
protection
Overload
protection for
compressor
o = OFF
n = Illuminated
¶ = Blink
P5
H2
H3
OFF 3s
and blink
15 times
OFF
3s and
blink
once
OFF
3s and
blink
twice
OFF
3s and
blink 3
times
o ¶ o o
o ¶ ¶ o
During cooling and
drying operating,
the compressor will
stop while indoor fan
will operate; During
heating operation the
complete unit will
stop operating
Defrosting will
occur in heating
mode. Compressor
will operate while
indoor fan will stop
operation
/ /
During cooling and
drying operation,
compressor will stop
while indoor fan
will operate; During
heating operation,
the complete unit
will stop operation.
Refer to the
malfunction analysis
(IPM protection,
loss of synchronism
protection and
overcurrent
protection of
phase current for
compressor.
It’s the normal state
1. Wiring terminal
OVC-COMP is
loosened. In normal
state, the resistance
for this terminal
should be less than
1ohm 2. Refer to
the malfunction
analysis (discharge
protection,
overload)
73
Page 74
Malfunction
Name
System is
abnormal
IPM protection H5
PFC protection HC
Desynchronizing
of compressor
Dual-8
Code
Display
H4
H7
Fault Displays
18,000 and 24,000 btuh units
Indoor Unit Displaying Method Outdoor Unit Display (LED)
Indicator Display (during
blinking, ON 0.5s and OFF 0.5s
Running
LED
Cooling
LED
Heating
LED
OFF
3s and
blink 4
times
OFF
3s and
blink 5
times
OFF
3s and
blink 6
times
OFF
3s and
blink 7
times
Indicator has 3 kinds of display status
and during blinking, ON 0.5s and OFF
0.5s
D40/D5D41/D6D42/
D16
n o n n
o ¶ o n
o n ¶ ¶
o ¶ n ¶
D43/
D30
A/C Status Malfunctions
During cooling
and drying
operation,
compressor will
stop while indoor
fan will operate;
During heating
operation, the
complete unit will
stop operation.
During cooling
and drying
operation,
compressor will
stop while indoor
fan will operate;
During heating
operation, the
complete unit will
stop operation.
During cooling
and drying
operation,
compressor will
stop while indoor
fan will operate;
During heating
operation, the
complete unit will
stop operation.
During cooling
and drying
operation,
compressor will
stop while indoor
fan will operate;
During heating
operation, the
complete unit will
stop operation.
Refer to the
malfunction
analysis
(overload, high
temperature
resistant)
Refer to the
malfunction
analysis (IPM
protection, loss
of synchronism
protection and
overcurrent
protection of
phase current for
compressor)
Refer to the
malfunction
analysis
Refer to the
malfunction
analysis (IPM
protection, loss
of synchronism
protection and
overcurrent
protection of
phase current for
compressor)
o = OFF
n = Illuminated
¶ = Blink
74
Page 75
Malfunction
Name
Decrease
frequency due to
high temperature
resistant
during heating
operation
Fault Displays
18,000 and 24,000 btuh units
Indoor Unit Displaying Method Outdoor Unit Display (LED)
Indicator has 3 kinds of display
status and during blinking, ON 0.5s
and OFF 0.5s
D40/D5D41/D6D42/
D16
n o ¶ ¶
Dual-8
Code
Display
H0
Indicator Display (during
blinking, ON 0.5s and OFF 0.5s
Running
LED
Cooling
LED
Heating
LED
OFF
3s and
blink 10
times
D43/
D30
A/C Status Malfunctions
All loads operate
normally, while
operation frequency
for compressor is
decreased
Refer to the
malfunction
analysis (overload,
high temperature
resistant)
Failure startup LC
Malfunction of
phase current
detection circuit
for compressor
EEPROM
malfunction
Charging
malfunction of
capacitor
o = OFF n = Illuminated ¶ = Blink
U1
EE
PU
OFF
3s and
blink 11
times
OFF
3s and
blink 13
times
OFF
3s and
blink 15
times
OFF
3s and
blink 17
times
o ¶ o ¶
o ¶ n o
o o o n
o n o n
During cooling and
drying operation,
compressor will stop
while indoor fan
will operate; During
heating operation,
the complete unit
will stop operation.
During cooling and
drying operation,
compressor will stop
while indoor fan
will operate; During
heating operation,
the complete unit
will stop operation.
During cooling and
drying operation,
compressor will stop
while indoor fan
will operate; During
heating operation,
the complete unit
will stop
During cooling and
drying operation,
compressor will stop
while indoor fan
will operate; During
heating operation,
the complete unit
will stop
Refer to the
malfunction
analysis
Replace outdoor
control panel AP1
Replace outdoor
control panel AP1
Refer to the part
three--charging
malfunction
analysis of
capacitor
75
Page 76
Malfunction
Name
Malfunction
of module
temperature
sensor circuit
Module high
temperature
protection
Malfunction
of voltage
dropping for
DC bus-bar
Fault Displays
18,000 and 24,000 btuh units
Indoor Unit Displaying Method Outdoor Unit Display (LED)
Indicator has 3 kinds of display status
and during blinking, ON 0.5s and OFF
0.5s
D40/D5D41/D6D42/
D16
o o n ¶
n o ¶ n
o n n n
Dual-8
Code
Display
P7
P8
U3
Indicator Display (during
blinking, ON 0.5s and OFF 0.5s
Running
LED
Cooling
LED
Heating
LED
OFF
3s and
blink 18
times
OFF
3s and
blink 19
times
OFF
3s and
blink 20
times
D43/
D30
A/C Status Malfunctions
During cooling and
drying operation,
compressor will stop
while indoor fan
will operate; During
heating operation,
the complete unit
will stop
During cooling and
drying operation,
compressor will stop
while indoor fan
will operate; During
heating operation,
the complete unit
will stop
During cooling and
drying operation,
compressor will stop
while indoor fan
will operate; During
heating operation,
the complete unit
will stop
Replace outdoor
control panel AP1
Aer the complete
unit is deenergized
for 20 mins,
check whether
the thermal
grease on IPM
Module of outdoor
control panel
AP1 is sucient
and whether the
radiator is inserted
tightly. If its no
use, please replace
control panel AP1
Supply voltage is
unstable
o = OFF
n = Illuminated
¶ = Blink
76
Page 77
Malfunction
Name
Voltage of DC
bus-bar is too
low
Limit/decrease
frequency due to
high temperature
of module
e four-way
valve is abnormal
Fault Displays
18,000 and 24,000 btuh units
Indoor Unit Displaying Method Outdoor Unit Display (LED)
Indicator has 3 kinds of display
status and during blinking, ON 0.5s
and OFF 0.5s
D40/D5D41/D6D42/
D16
o n n o
n n n ¶
n o ¶ o
Dual-8
Code
Display
PL
EU
U7
Indicator Display (during
blinking, ON 0.5s and OFF 0.5s
Running
LED
Cooling
LED
Heating
LED
OFF
3s and
blink 21
times
D43/
D30
A/C Status Malfunctions
During cooling
and drying
operation,
compressor will
stop while indoor
fan will operate;
During heating
operation, the
complete unit will
stop
All loads operate
normally, while
operation
frequency for
compressor is
decreased
If this malfunction
occurs during
heating operation,
the complete unit
will drop operation
1. Measure the
voltage of position
L and N on wiring
board (XT), if the
voltage is higher
than 150VAC, turn
on the unit aer
the supply voltage
is increased to the
normal range. 2.
If the AC input is
normal, measure
the voltage of
electrolytic capacitor
C on control panel
(AP1), if its normal,
theres malfunction
for the circuit,
please replace the
control panel AP1
Discharging aer
the complete unit
is de-energized
for 20 mins, check
whether the thermal
grease on IPM
Module of outdoor
control panel AP1
is sucient and
whether the radiator
is inserted tightly.
If its no use, please
replace control
panel AP1
1. Supply voltage is
lower than AC175V;
2. Wiring terminal
4V is loosened or
broken; 3. 4V is
damaged, please
replace 4V
o = OFF
n = Illuminated
¶ = Blink
77
Page 78
Malfunction
Name
Zero crossing
malfunction
of outdoor
unit
Limit/
decrease
frequency
due to anti
freezing
Fault Displays
18,000 and 24,000 btuh units
Indoor Unit Displaying Method Outdoor Unit Display (LED)
Indicator has 3 kinds of display status
and during blinking, ON 0.5s and OFF
0.5s
D40/D5D41/D6D42/
D16
n n ¶ o
n n n o
Dual-8
Code
Display
U9
FH
Indicator Display (during
blinking, ON 0.5s and OFF 0.5s
Running
LED
Cooling
LED
Heating
LED
D43/
D30
A/C Status Malfunctions
During cooling
operation,
compressor will
stop while indoor
fan will operate;
during heating the
complete unit will
stop operation
All loads operate
normally, while
operation frequency
for compressor is
decreased
Replace outdoor
control panel AP1
Poor air-return in
indoor unit or fan
speed is too low
o = OFF
n = Illuminated
¶ = Blink
78
Page 79
Troubleshooting 9,000 & 12,000 Units
Indoor Fan does not Operate
Is the indoor control board fastened securely and wired correctly?
Are the input voltages within 10% of rated value?
Energize the unit
Proper Voltage between
L & N
Yes
Check connection on
indoor board
Yes
Replace indoor board
No
No
Check power
supply
Repair connections
No
operating properly
Is system
Yes
Yes
Is system
operating properly
Yes
End Troubleshooting
No
Replace indoor
motor
Yes
79
Page 80
Troubleshooting 9,000 & 12,000 Units
Temperature Sensor Malfunction
Start Temperature Sensor
Troubleshooting
Temperature sensor malfunction
F1 & F2 will relate to indoor sensor faults
F4 & F5 will relate to outdoor sensor faults
Is the sensor wire plug loose from
control board
No
Is there a short or open circuit in the
wire or sensor?
No
Yes
Insert the plug correctly
Is problem corrected?
Yes
Replace sensor or correct
wire problem
Is problem corrected?
Yes
Do the temperature sensor readings
compare to the resistance table in
the Appendix?
Yes
Replace the controller with the same
part number
End Troubleshooting
80
No
Replace the sensor with
appropriate part number
Is problem corrected?
Yes
Page 81
Troubleshooting 9,000 & 12,000 Units
Start Failure Malfunction
Energize and
start the unit
No
The stop duration of the unit
is not long enough, the high
and low side pressure of
the system is not balanced,
restart it after 3 minutes
Is the stop duration of the compressor longer than
3 minutes.
Yes
Are the wire connections
on the compressor
connected properly
Yes
Is the unit overcharged
Yes
Charge the unit according
to the “Charging” section of
this manual
Eliminate the malfunction
No
No
Yes
Reconnect the wires
according to the wiring
diagram
Eliminate the malfunction
Yes
No
Replace the outdoor main
board
Eliminate the malfunction
No
Replace the compressor
End Troubleshooting
Yes
81
Page 82
Troubleshooting 9,000 & 12,000 Units
Desynchronizing of Compressor aer Unit is Started
H7
Desynchronizing of compressor
Status:
During cooling mode, compressor will stop,
indoor fan will run. Heating mode all units
stop.
Troubleshooting Procedure for Synchronizing Fault after Unit is Started
Start Troubleshooting after unit
is powered off for 3 minutes
Are the compressor terminal
connected properly?
Yes
Replace Control Board AP1
No
1. Check the resistance of the compressor
terminals and connections to the compressor
2. Check for overcharge of refrigerant
3. Check for correct voltage
4. Check for dirty coils and lters
Compressor Wires
Yes
Remove Malfunction?
No
Replace Compressor
End Troubleshooting
Correct wiring
problem
Illustration is for
reference only, actual
model may vary.
82
Page 83
Troubleshooting 9,000 & 12,000 Units
Desynchronizing of Compressor During Operation
H7
Desynchronizing of compressor
Status:
During cooling mode, compressor will stop,
indoor fan will run. Heating mode all units
stop.
Troubleshooting Procedure for Synchronizing Fault During Operation
Start Troubleshooting
Is the outdoor fan working
properly?
Yes
Are there any airow obstructions?
Yes
No
Are wire connections
proper?
Yes
Replace Fan
Capacitor C1
1. Check the resistance of the compressor
terminals and connections to the compressor
2. Check for overcharge of refrigerant
3. Check for correct voltage
Wire per diagram.
Fan Operating
Properly?
Yes
No
Is input voltage normal?
Yes
Is unit overcharged?
Replace Control Board
AP1
No
No
Improve airow
Correct voltage
problem
Charge per
installation manual
Malfunction corrected
Yes
Replace Outdoor Fan
Motor?
No
Replace Compressor
Yes
End Troubleshooting
83
Page 84
Troubleshooting 9,000 & 12,000 Units
Overload and Discharge Malfunction
Start
Replace the overload
protector
Is the Overload connections OK
Yes
No
Check the resistance between the
two ends of the overload protector in
ambient temperature. Is the resistance
below 1K
Yes
Is the wiring of the
electronic expansion valve
connected well
Yes
Check the coil of the electronic expansion
valve per instructions in this manual.
Replace if faulty
No
No
Reconnect according to the
wring diagram
Check the refrigerant status, if there is leakage,
84
Eliminate the malfunction
No
recharge according to this service manual.
Eliminate the malfunction
No
Replace outdoor main
board
Yes
Yes
End Troubleshooting
Page 85
Troubleshooting 9,000 & 12,000 Units
Communication Failure
E6
Communication Failure
Status:
Cooling operation, compressor stops while
indoor fans runs. Heating operation, complete
unit stops
Communication failure of
some units
De-energize, check the wire
connections of indoor and outdoor
units and power to outdoor unit
Are all connections
correct?
No
1. Improper voltages
2. Mis-matched indoor and outdoor units
3. Improper wiring between indoor and outdoor
units
Correct connections
Did this correct the
problem?
No
Yes
De-energize, change the communication wire
of the working/communication indoor unit and
malfunctioning/non-communicating indoor unit,
then energize the unit and wait for 3 minutes
The malfunction
indoor unit
resumes normal
Yes
Replace the main board of the malfunctioning
indoor unit
Yes
End Troubleshooting
Replace outdoor main board
85
Page 86
Troubleshooting 18,000 & 24,000 Units
Temperature sensor malfunction
Start Temperature Sensor
Troubleshooting
Is the sensor wire plug loose from
the control board?
No
Is there a short or open circuit in the
wire or sensor?
No
Yes
Insert the plug correctly
Is problem corrected?
Yes
Replace sensor or correct
wire problem
Is problem corrected?
Yes
Do the temperature sensor readings
compare to the resistance table in
the Appendix?
Yes
Replace the controller with the same
part number
End Troubleshooting
86
No
Replace the sensor with
appropriate part number
Is problem corrected?
Yes
Page 87
Troubleshooting 18,000 & 24,000 Units
Indoor fan does not operate
Possible causes:
1. Fan motor locked
2. The control or feedback terminal of PG not connected properly
3. Damaged motor
4. Main board malfunction
Energize the unit
Does fan turn freely?
Yes
Is the feedback
terminal PG motor
loose?
Is the control terminal
of PG motor loose?
Re-energize unit to turn unit on.
Measure within one minute after the
louvers are opened whether the output
voltage on the control terminal of the
PG motor is > 50 volts
No
Yes
Yes
Find obstruction
Repair connections
Repair connections
Yes
Replace indoor
OK
OK
OK
motor
No
Replace indoor board
End Troubleshooting
87
Page 88
Troubleshooting 18,000 & 24,000 Units
Jumper Cap Malfunction
C5
Jumper Cap Malfunction
Status:
Wireless remote will not send command to
indoor unit.
Start Troubleshooting
Is there a jumper cap on the
controller?
Yes
Is the jumper cap
inserted correctly?
No
No
1. No jumper cap inserted on board
2. Jumper cap not fully seated
3. Jumper cap damaged
4. Bad control board
Install a matching
jumper cap
Yes
Is system
operating properly
Re-insert the jumper
cap
Yes
88
Yes
Replace the jumper
cap
Is system
operating properly
No
Replace the main
control board
End Troubleshooting
Yes
No
Is system
operating properly
Yes
Page 89
Troubleshooting 18,000 & 24,000 Units
Overcurrent Protection
E5
Overcurrent Protection
Status:
During cooling & dehumidifying, indoor unit
operates while other functions stop; During
heating operation, complete unit stops
Fault & Status Possible Causes
Start Troubleshooting
Check if compressor’s connection
line is properly connected
Yes
Check if current value is higher than
the protectors setting
No
No
1. Supply voltage is unstable
2. Supply voltage is too low
3. Coils are dirty
4. Improper refrigerant charge
Adjust compressor’s
connection line
Replace overcurrent protector
Yes
Is units high pressure normal
Yes
Check if unit voltage is normal
Yes
Replace main board
No
No
Refer to high pressure
protection error
Check connections, contact
electric utility company
89
Page 90
Troubleshooting 18,000 & 24,000 Units
Capacity Charging Malfunction
PU
Charging Malfunction of Capacitor
Status:
During cooling mode, compressor will stop,
indoor fan will run. Heating mode all units
stop.
Start Troubleshooting after unit
is powered on for 1 minute
Use a DC voltmeter to
measure the voltage
across the terminals of the
electrolytic capacitor
Voltage higher than 200v
No
Yes
1. Improper input voltage
2. Poor connection on reactor
3. Reactor damaged
4. Bad AP1 control board
The detection circuit
of the outdoor
mainboard has
malfunctioned
Replace outdoor main
board
Check if the inductor wiring is
loose or induction is cut off
No
Shut down power and wait 20
minutes or connect a DC voltmeter
to the electrolytic capacitor until the
voltage is less than 20 v
No
Replace the outdoor mainboard
End Troubleshooting
Yes
Replace the inductor
or reconnect wires
Is the malfunction
corrected?
No
Yes
90
Page 91
Troubleshooting 18,000 & 24,000 Units
IPM Protection Malfunction (unit will not run)
Fault & Status
IPM Protection
Status:
During cooling mode, compressor will stop,
indoor fan will run. Heating mode all units
stop.
Start Troubleshooting after unit
is powered off for 3 minutes
Are the compressor terminal
connected properly?
Yes
Check the compressor winding
resistance
Possible Causes
1. Dirty indoor and outdoor coils
2. Faulty indoor or outdoor fans
3. High system pressure
4. Over charge of refrigerant
No
Is the resistance normal?
Yes
Test the isolation impedance between
the three phases of the compressor
and copper tubing
No
Is the resistance above
500MΩ?
Replace Compressor
Is Malfunction eliminated?
No
Replace the outdoor mainboard
No
Correct wiring
problem
End Troubleshooting
91
Page 92
Troubleshooting 18,000 & 24,000 Units
Compressor Overload, Discharge Protection Malfunction
1. Check the resistance of the compressor terminals and connections to the compressor
2. Check for overcharge of refrigerant
3. Check for correct voltage
4. Check for dirty coils and lters
Start
Replace the overload
protector
Is the Overload connections OK
Yes
No
Check the resistance between the
two ends of the overload protector in
ambient temperature. Is the resistance
below 1K
Yes
Is the wiring of the
electronic expansion valve
connected well
Yes
Check the coil of the electronic expansion
valve per instructions in this manual.
Replace if faulty
No
No
Reconnect according to the
wring diagram
Check the refrigerant status, if there is leakage,
recharge according to this service manual.
92
Eliminate the malfunction
No
Eliminate the malfunction
No
Replace outdoor main
board
End Troubleshooting
Yes
Yes
Page 93
Troubleshooting 18,000 & 24,000 Units
Desynchronize Malfunction, continued next page
H7
Desynchronizing of compressor
Status:
During cooling mode, compressor will stop,
indoor fan will run. Heating mode all units
stop.
Troubleshooting Procedure for Synchronizing Fault after Unit is Started
Start Troubleshooting after unit
is powered off for 3 minutes
Are the compressor terminal
connected properly?
Yes
Replace Control Board AP1
No
1. Check the resistance of the compressor
terminals and connections to the compressor
2. Check for overcharge of refrigerant
3. Check for correct voltage
4. Check for dirty coils and lters
Yes
Remove Malfunction?
No
Replace Compressor
End Troubleshooting
Correct wiring
problem
93
Page 94
Troubleshooting 18,000 & 24,000 Units
Desynchronize Malfunction, continued
H7
Desynchronizing of compressor
Status:
During cooling mode, compressor will stop,
indoor fan will run. Heating mode all units
stop.
Troubleshooting Procedure for Synchronizing Fault During Operation
Start Troubleshooting
Is the outdoor fan working
properly?
Yes
Are there any airow obstructions?
Yes
No
Are wire connections
proper?
Yes
Replace Fan
Capacitor C1
1. Check the resistance of the compressor
terminals and connections to the compressor
2. Check for overcharge of refrigerant
3. Check for correct voltage
Wire per diagram.
Fan Operating
Properly?
Yes
No
Is input voltage normal?
Yes
Is unit overcharged?
Replace Control Board
AP1
No
No
Improve airow
Correct voltage
problem
Charge per
installation manual
Malfunction corrected
Yes
Replace Outdoor Fan
Motor?
No
Replace Compressor
Yes
End Troubleshooting
94
Page 95
Troubleshooting 18,000 & 24,000 Units
Anti-High Temperature, Overload Protection
High Discharge Temperature Protection of
Compressor.
Status:
Cooling operation, compressor stops while
indoor fans runs. Heating operation, complete
unit stops
Start Troubleshooting
Is outdoor temperature above 127 0F
Remove power, then restart after 20
minutes
Are indoor and outdoor coils clean
and free from obstructions?
Yes
No
1. Is unit running in proper outdoor ambient range
2. Faulty outdoor temperature sensor
3. Refrigerant leak
4. Poor airow of outdoor unit
5. Follow Troubleshooting procedure
Normal protection, outdoor
ambient is higher than normal
parameters
Clean Coils
Yes
Are indoor and outdoor fans
operating properly?
Yes
Replace AP1 control board
End Troubleshooting
1. Check fan for obstruction
No
2. Check resistance of fan
leads and voltage to
motor
3. Check fan connections
Replace fan
95
Page 96
Unit Will Not Start
Troubleshooting 18,000 & 24,000 Units
Indoor and
outdoor unit
inoperative
Power voltage low
Outdoor unit will not start
Remote controller not
responding
Ensure proper voltage, should be withing 10%
of nameplate
No power
Poor electrical connection Check wire connections
Controller fuse open Replace fuse
Defective controller board
No power at remote
controller
Check fuses or circuit
breakers
Replace controller board
Replace remote controller
batteries
96
Circuit breaker tripping
Remote controller
malfunction
Indoor receiver defective
Breaker trips
immediately
Breaker trips within minutes
of turning on
Breaker is warm to touch
Press the “Auto” button.
If no response, check
for proper voltage and
connections. If there is
a response, check for
defective remote controller
or indoor receiver.
Check for shorted wires,
reactor or AP2 board
Individual components
could be defective.
Eliminate by checking
resistance on each
individual component.
Check insulation on wires
and proper positioning of
wires.
Check for defective
breaker, poor wire
connections
Page 97
Startup Failure
Troubleshooting 18,000 & 24,000 Units
Energize and
start the unit
No
The stop duration of the unit
is not long enough, the high
and low side pressure of
the system is not balanced,
restart it after 3 minutes
Is the stop duration of the compressor longer than
3 minutes.
Yes
Are the wire connections
on the compressor
connected properly
Yes
Is the unit overcharged
Yes
Charge the unit according
to the “Charging” section of
this manual
Eliminate the malfunction
No
No
Yes
Reconnect the wires
according to the wiring
diagram
Eliminate the malfunction
Yes
No
Replace the outdoor main
board
Eliminate the malfunction
No
Replace the compressor
End Troubleshooting
Yes
97
Page 98
Troubleshooting 18,000 & 24,000 Units
Compressor Overload, Discharge Protection Malfunction
Start
Replace the overload
protector
Is the Overload connections OK
Yes
No
Check the resistance between the
two ends of the overload protector in
ambient temperature. Is the resistance
below 1K
Yes
Is the wiring of the
electronic expansion valve
connected well
Yes
Check the coil of the electronic expansion
valve per instructions in this manual.
Replace if faulty
No
No
Reconnect according to the
wring diagram
Check the refrigerant status, if there is leakage,
98
Eliminate the malfunction
No
recharge according to this service manual.
Eliminate the malfunction
No
Replace outdoor main
board
Yes
Yes
End Troubleshooting
Page 99
Troubleshooting 18,000 & 24,000 Units
PFC Malfunction (correction for power factor)
HC
PFC (Power Factor Correction) Protection
Status:
During cooling & dehumidifying, indoor unit
operates while other functions stop; During
heating operation, complete unit stops
Start Troubleshooting
Check wiring of the reactor
(L) and PFC capacitor
(Outdoor Unit)
1. Check for damage to the reactor and PFC
capacitor of the outdoor unit
2. Refer to troubleshooting procedure below
Are wires connected proper
Are wires connected proper
with no short circuits?
with no short circuits?
Yes
Remove the PFC Capacitor
and test resistance of the
two terminals.
Is the resistance
about zero?
No
Disconnect the reactor wires & measure
the resistance between the two terminals
of the reactor
Is the reactor
damaged or
shorted?
No Yes
Yes
Yes
Correct according
to circuit diagram.
Replace the
capacitor
Replace the reactor
Is problem
corrected?
No
Is problem
corrected?
No
Is problem
corrected?
Yes
Yes
Replace the AP1
control panel
End Troubleshooting
No
99
Page 100
Troubleshooting 18,000 & 24,000 Units
Communication Malfunction of Indoor Unit, continued next page for Outdoor Unit
E6
Communication Failure
Status:
Cooling operation, compressor stops while
indoor fans runs. Heating operation, complete
unit stops
Communication failure of
some indoor units
De-energize, check the wire
connections of indoor and outdoor
units and power to outdoor unit
1. Improper voltages
2. Mis-matched indoor and outdoor units
3. Improper wiring between indoor and outdoor
units
Are all connections
correct?
De-energize, change the communication wire
of the working/communication indoor unit and
malfunctioning/non-communicating indoor unit,
then energize the unit and wait for 3 minutes
The malfunction
indoor unit
resumes normal
Yes
Replace the main board of the malfunctioning
indoor unit
No
Yes
End Troubleshooting
Correct connections
Replace outdoor main board
Did this correct the
problem?
No
Yes
100
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