Cooper&Hunter CH24KRL230V Troubleshooting Guide
INSTALLATION
AND
MAINTENANCE
TROUBLESHOOTING
Content:
1. Precautions before Performing Inspection or Repair
2. Conrmation
3. Flashing LED of Indoor/Outdoor Unit and Primary Judgement
4. How to Check Simply the Main Part
5. Troubleshooting for Normal Malfunction
1. Troubleshooting
1.1 Precautions before Performing Inspection or Repair
Be cautious during installation and maintenance. Do operation following the regulations to avoid electric shock and casualty or even death
due to drop from high attitude.
* Static maintenance is the maintenance during de-energization of the air conditioner.
For static maintenance, make sure that the unit is de-energized and the plug is disconnected.
*dynamic maintenance is the maintenance during energization of the unit.
Before dynamic maintenance, check the electricity and ensure that there is ground wire on the site. Check if there is electricity on the housing and connection copper pipe of the air conditioner with voltage tester. After ensure insulation place and the safety, the maintenance can
be performed.
Take sufcient care to avoid directly touching any of the circuit parts without rst turning off the power.
At times such as when the circuit board is to be replaced, place the circuit board assembly in a vertical position.
Normally,diagnose troubles according to the trouble diagnosis procedure as described below.(Refer to the check points in servicing written
on the wiring diagrams attached to the indoor/outdoor units.)
No. Troubleshooting procedure
1 Conrmation
2 Judgement by Flashing LED of Indoor/Outdoor Unit
3 How to Check Simply the Main Part
NOTE:
A large-capacity electrolytic capacitor is used in the outdoor unit controller(inverter).Therefore,if the power supply is turned
off,charge(charging voltage DC280V to 380V)remains and discharging takes a lot of time. After turning off the power source,if touching the
charging section before discharging, an electrical shock may be caused. Discharge the electrolytic capacitor completely by using soldering
iron,etc.
Discharging method
(1)remove the inverter cover(Outoor Unit)
(2)As shown below,connect the discharge rescharge resistance(approx.100Ω,20W) or plug of the soldering iron to voltage between + -
terminals of the electrolytic capacitor (test 3*D* and *E* point) on PC Board for 30s ,and then perform discharging
2
Installation and Maintenance
2. Conrmation
(1)Conrmation of Power Supply
Conrm that the power breaker operates(ON) normally;
(2)Conrmation of Power Voltage
Conrm that power voltage is AC 208-230 ±10%. If power voltage is not in this range, the unit may not operate normally.
3. Flashing LED of Indoor/Outdoor Unit and Primary Judgement
3
(1)Models:09/12K:
Malfunction and Status Display Table
15 times
Display of Malfunction of Indoor Unit
No. Malfunction Name
1 Malfunction of Circuit for zero cross detection U8
2 Malfunction protection for jumper cap C5
3 No feedback from indoor motor H6
Indoor ambient temp sensor has open or short
4
Indoor evaporator temp sensor has open or
5
Liquid valve temp sensor has open or short
6
7
8 Module temp sensor has open or short circuit P7
9
10
11
12
13
14
15
16 Demagnetization protection of compressor HE
17 Malfunction of voltage drop of DC bus bar U3
18 Module temperature protection P8
19
20 Malfunction of charging for capacitor PU
21 High pressure protection for the system E1
22
23
24
25 Overspeed (for commercial air conditioner)
26 Malfunction of
27
28
29
30
31 Thermal overload protection for compressor H3
32 Non-match between indoor and outdoor units LP
33 Malfunction of memory chip
Gas valve temp sensor has open or short
Outdoor ambient temp sensor has open or
Outdoor inlet pipe temp sensor of condenser
has open or circuit (for commercial use)
Outdoor middle pipe temp sensor of condenser
Outdoor outlet pipe of condenser has open or
Outdoor discharge temp sensor has open or
Communication malfunction of indoor and
Malfunction of circuit for detecting phase
Lack of refrigerant or block protection for the
Reset of drive module (for commercial air
AC contactor protection (for commercial air
Temperature drift protection(for commercial air
Sensor connection protection (for commercial
Communication malfunction for drive board(for
has open or short circuit
short circuit (for commercial use)
current of compressor
system (not applicable to residential air
Low pressure protection for the system
Lock of compressor (for commercial air
commercial air conditioner)
circuit
short circuit
circuit
circuit
short circuit
short circuit
outdoor units
conditioner)
reserved
conditioner)
conditioner)
conditioner)
conditioner)
air conditioner)
Malfunction
Type
Malfunction
of
hardware
Display
Nixie
Tube
Operation
F1
F2
b5
b7
F3
A5
F4
A7
F5
E6
U1
F0
E3
LE / / /
P0 / / /
/ / /
LF
/ / /
PF
P9 / / /
PE / /
Pd / / /
P6
EE
Status of LED Lamp
LED
Lamp
for
Blinks
for 17
times
Blinks
for 15
times
Blinks
for 11
times
Blinks
for 6
times
Blinks
once
Blinks
for 3
times
Blinks
for 16
times
LED Lamp
for
Cooling
Blinks
once
Blinks
twice
Blinks for
19 times
Blinks for
22 times
Blinks for
3 times
Blinks for
4 times
Blinks for
5 times
Blinks for
10 times
LED Lamp
Heating
Blinks for
18times
Blinks for
12 times
Blinks for
14 times
Blinks for
20 times
Blinks for
19 times
Blinks for
17 times
Blinks for
3 times
Blinks for
Malfunction of
Outdoor Unit
Status of LED
Lamp
for
Yellow
LED
Lamp
Blinks for
10 times
Blinks for
8 times
Blinks for
16 times
Red
LED
Lamp
Blinks
for 6
times
Blinks
for 5
times
Blinks
for 7
times
Blinks
for 9
times
4
Installation and Maintenance
34
Wrong connection of communication wire or
times
35
36
37 Mode conflict E7
38 Refrigerant reclaiming mode Fo
39 Oil return under defrosting or heating H1
40 Nominal cooling or heating (capacity test code) P1 / / /
41 Max. cooling or heating (capacity test code) P2 / / /
42 Middle cooling or heating(capacity test code) P3 / / /
43 Min. cooling or heating(capacity test code) P0 / /
44 Failure of startup of compressor Lc
45
46 Overload protection E8
47 Overcurrent protection for the complete unit E5
48 Overcurrent protection for the complete unit P5
49 Desynchronizing of compressor H7
50 Lack/reverse phase protection of Ld / / /
51 Module current protection (IPM protection) H5
52 Overlow voltage protection for DC bus bar PL
53 Overhigh voltage protection for DC bus bar PH
54 PFC protection HC
55 Overhigh power protection (not for outdoor L9
56 Abnormal reversing of 4-way valve U7
57
58
59
60 Frequency limit/decrease for freeze protection FH
61 Frequency limit/decrease for overload F6
62
63 Oil return in cooling F7
64 Cold air prevention E9
65 Freeze protection E2
66 Reading malfunction of EEPROM
67 Reaching temperature for turning on the unit
68 Frequency limit (power)
69 Malfunction of outdoor fan
malfunction of expansion valve (free match)
Malfunction of current detection for the
Wrong connection of communication wire or
status of detecting malfunction of expansion
High discharge temperature protection of
Frequency limit/decrease for current protection
Frequency limit/decrease for current protection
of the module (phase current)
Frequency limit/decrease for high discharge
Frequency limit/decrease for module
complete unit
valve (free match)
compressor
of the complete unit
temperature
temperature protection
Display is
controlled
by remote
control
dn / / /
U5
dd / / /
Blinks
for 7
times
Blinks
once
E4
F8
En / / /
F9
EU
Blinks
for 4
times
Blinks
for 8
times
Blinks
for 5
times
Blinks
for 20
times
Blinks
for 9
times
Blinks
twice
Blinks for
13 imes
Blinks
once
Blinks for
11 times
Blinks for
20 times
Blinks for
8 times
Blinks for
9 times
Blinks
twice
Blinks for
6 times
Blinks for
6 times
Blinks for
7 times
Blinks
once
Blinks for
11 times
Blinks for
15 times
Blinks for
7 times
Blinks for
5 times
Blinks for
21 times
Blinks for
6 times
Blinks
twice
Blinks for
6 times
Blinks
twice
Blinks for
7 times
Blinks for
6 times
Blinks for
5 times
Blinks for
4 times
Blinks for
12 times
Blinks for
13 times
Blinks for
14 times
Blinks for
9 times
Blinks
once
Blinks
twice
Blinks for
3 times
Blinks for
11 times
Blinks
for 4
times
Blinks
for 3
times
Blinks
for 11
times
Blinks
for 8
times
Blinks
13time
Blinks
for 14
for
s
Installation and Maintenance
5
If malfunction occurs,corresponding code will display and the unit will resume normal until protection or
malfunction disappears.
Compressor stars (normal)Yellow indicator blinks for once
Yellow indicator
blinks for twice
Yellow indicator blinks for 3 times
Yellow indicator blinks for 4 times
Yellow indicator blinks for 5 times
Yellow indicator blinks for 6 times
Yellow indicator blinks for 7 times
Yellow indicator blinks for 8 times
Defrosting
Anti-freezing protection (normal
IPM protection
Overcurrent protection
Overload protection
Exhaust protection
Overlod protection of compresoor
(normal display of indoor unit)
display of indoor unit)
Indicator display
of outdoor unit
Red indicator blinks for once
Red indicator blinks for twice
Red indicator blinksfor 3 times
Cooling (dehumidify) or heating current
dropped frequency current.
Exhaust temp. dropped frequency temp.
Tube
temp. dropped frequency temp.
Red indicator blinks for 4 times
Red indicator blinks for 5 times
Red indicator for 6 times
Red indicator blinks for 7 times
Red indicator blinks for 8 times
Green indicator does not blink
T
tube-in
dropped frequency temp.
Outdoor condenser temp. sensor mal.
Outdoor ambient temp. sensor mal.
Outdoor exhaust temp. sensor mal.
Starting at temp. does not reach
Communication is abnormal
6
Installation and Maintenance
A
nalysis or processing of some of the malfunction display:
1. Compressor discharge protection
operation;
malfunction of compressor; malfunction of protection relay; malfunction of discharge sensor; outdoor temperature too
high.
Processing method: refer to the malfunction analysis in the above section
2. Low voltage overcurrent protection
Possible reason: Sudden drop of supply voltage.
3. Communic ation malfun ction
Processing method: Check if communic ation signal cable is connected reliably
4. Sensor open or short circuit
Processing
f
lead wire is found.
5. Compressor over load protection
Possible
compresso
Processing
the
6. System malfun ction
Overload
e
temperature of indoor heat exchanger when heating) is too high, protection will beactivated.
Please refer to the malfunction analysis in the previous section for handling method
7. IPM module protection
Processing
power
the malfunction still exists,replace the module.
(2)Models:18/24K:
method: Check whethers ensor is normal, connected with the corre sponding position on the controller and if damage o
reasons: insufficient or too much refrigrant; blockage of capillary an dincrease of su ction temp.; improper running of
r, burning in or stuck of bearing, damage of discharge valve; malfunction of protector.
method: adjust refrige rant amount; replace the capillary; replace the compressor; use univers al meter to check if
.
.
.
protection.When tube temperature(Check the temperature of outdoor heat exchanger when cooling and check th
method:Once the module malfunction happens,if it persists for a long time and can not be self-canceled, cut off the
and turn off the unit,and then re-energize the unit again after about 10 min.After repeating the procedure for sever times, if
.
Installation and Maintenance
7
NO.
1
2
3
4
5
6
7
Malfunction
Name
High
pressure
protection of
system
Antifreezing
protection
High
discharge
temperature
protection of
compressor
Overcurrent
protection
Communication
Malfunction
High
temperature
resistant
protection
Internal
motor (fan
motor) do not
operate
Display Method of Indoor Unit
Dual-8
Display
Indicator Display (during
blinking, ON 0.5s and OFF 0.5s)
Code
E1
E2
E4
E5
E6
E8
H6
Operation
Indicator
OFF 3s
and blink
once
OFF 3S
and blink
twice
OFF 3S
and blink 4
times
OFF 3S
and blink 5
times
OFF 3S
and blink 6
times
OFF 3S
and blink 8
times
OFF 3S
and blink
11 times
Cool
Indicator
Heating
Indicator
Display Method of
Outdoor Unit
(Indicator has 3 kinds
of display status and
they will be displayed
circularly every 5s.)
□OFF
■Illuminated ƿBlink
D5
(D40)D6(D41)
D16
(D42)
D30
(D43)
ƶ ƿ ƿ ƿ
Ƶ ƶ Ƶ ƶ
Ƶ ƶ Ƶ ƿ
ƶ Ƶ ƿ ƶ
ƶ ƶ ƶ ƿ
Ƶ ƶ Ƶ Ƶ
A/C status Possible Causes
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, 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.
During cooling operation,
compressor stops while indoor
fan motor operates. During
heating operation, the complete
unit stops.
During cooling operation:
compressor will stop while
indoor fan will operate. During
heating operation, the complete
unit stops.
Internal fan motor, external fan
motor, compressor and electric
heater stop operation,guide
louver stops at present location.
Possible reasons:
1. Refrigerant was superabundant;
2. Poor heat exchange (including
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.
Refer to the corresponding
malfunction analysis.
Refer to the malfunction analysis
(overload, high temperature
resistant).
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.
1. No jumper cap insert on
Wireless remote receiver and
button are effective, but can
not dispose the related
command
During cooling and drying
operation, indoor unit operates
while other loads will stop;
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.
8
9
10
Malfunction
protection of
jumper cap
Indoor
ambient
temperature
sensor is
open/short
circuited
Overcurrent
protection of
phase
current for
compressor
C5
F1
P5
OFF 3S
and blink
15 times
OFF 3S
and blink
once
OFF 3S
and blink
15 times
ƶ ƿ ƶ ƶ
8
mainboard.
2. Incorrect insert of jumper cap.
3. Jumper cap damaged.
4. Abnormal detecting circuit of
mainboard.
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.
Refer to the malfunction
analysis (IPM protection, loss
of synchronism protection and
overcurrent protection of phase
current for compressor.
Installation and Maintenance
Malfunction
n
position
y
normal
electrolytic
e
operation.
n
,
s
NO.
Name
Dual-8
Code
Display
Indoor
evaporator
temperature
11
sensor is
open/short
circuited
Outdoor
ambient
temperature
12
sensor is
open/short
circuited
Outdoor
condenser
temperature
13
sensor is
open/short
circuited
Outdoor
discharge
temperature
14
sensor is
open/short
circuited
Limit/
decrease
frequency
15
due to
overload
Decrease
frequency
16
due to
overcurrent
Decrease
frequency
due to
17
high air
discharge
Voltage for
18
19
DC bus-bar
is too high
Malfunction
of complete
units current
detection
PH
U5
Installation and Maintenance
Display Method of Indoor Unit
Indicator Display (during
blinking, ON 0.5s and OFF 0.5s)
Operation
Indicator
F2
F3
F4
F5
F6
F8
F9
Cool
Indicator
OFF 3S
and
blink
twice
OFF 3S
and
blink
3 times
OFF 3S
and
blink
4 times
OFF 3S
and
blink
5 times
OFF 3S
and
blink
for 6
times
OFF 3S
and
blink
8 times
OFF 3S
and
blink
9 times
OFF 3S
and
blink
11 times
OFF 3S
and
blink
13 times
Heating
Indicator
Display Method of
Outdoor Unit
(Indicator has 3 kinds
of display status and
they will be displayed
circularly every 5s.)
□OFF
■Illuminated
D5
(D40)D6(D41)
ƶ ƶ ƿ Ƶ
ƶ ƶ ƿ ƶ
ƿ
D16
(D42)
Blink
D30
(D43)
ƶ ƶ ƿ ƿ
Ƶ ƶ ƿ ƿ
Ƶ Ƶ ƶ Ƶ
Ƶ Ƶ ƶ ƶ
ƶ Ƶ ƶ ƿ
ƶ Ƶ ƿ Ƶ
A/C status Possible Causes
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
operation, compressor stops
while indoor fan will operate;
During heating operation,
the complete unit will stop
operation.
During cooling and drying
operation, compressor will sop
after operating for about 3 mins,
while indoor fan will operate;
During heating operation, the
complete unit will stop after
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
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, the compressor will
stop while indoor fan will operate;
During heating operating,
the complete unit will stop
1. Loosening or bad contact of
Indoor
evaporator temp. sensor and
mainboard terminal.
2. Components on the mainboard
fall
down leads short circuit.
3. Indoor evaporator temp. sensor
damaged.(check temp. sensor
value
chart for testing)
4. Mainboard damaged.
Outdoor temperature sensor
hasnt been connected well or
is damaged. Please check it by
referring to the resistance table for
temperature sensor)
Outdoor temperature sensor
hasnt been connected well or
is damaged. Please check it by
referring to the resistance table for
temperature sensor)
1.Outdoor temperature sensor
hasnt been connected well or is
damaged. Please check it by
referring to the resistance table for
temperature sensor)
2.The head of temperature sensor
hasnt been inserted into the
copper tube
Refer to the malfunction analysis
(overload, high temperature
resistant)
The input supply voltage is too
low;
System pressure is too high and
overload
Overload or temperature is too
high;
Malfunction of electric expansio
valve (EKV)
1. Measure the voltage of
L and N on wiring board (XT), if
the voltage is higher than 265VAC,
turn on the unit after the suppl
voltage is increased to the
range.
2.If the AC input is normal,
measure the voltage of
capacitor C on control panel (AP1),
if its normal, theres malfunction
for the circuit, please replace th
control panel (AP1)
Theres circuit malfunction o
outdoor units control panel AP1
please replace the outdoor unit
control panel AP1.
9
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