Fujitsu ARG60LHTA, AOG60LATT Service Instruction

SPLIT TYPE

AMP Air Conditioning

www.ampair.co.uk | [e-mail]

ROOM AIR CONDITIONER

SERVICE

INSTRUCTION

Models Indoor unit Outdoor unit

AR* G60LHTA

DUCT

INVERTER

type

AO* G60LATT

R410A

CONTENTS

AMP Air Conditioning

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1. SPECIFICATIONS

1. DESCRIPTION OF EACH CONTROL OPERATION

1-1 COOLING OPERATION............................................................................................

1-1-1 COOLING CAPACITY CONTROL......................................................................

1-2 HEATING OPERATION.............................................................................................

1-2-1 HEATING CAPACITY CONTROL......................................................................

1-3 DRY OPERATION......................................................................................................

1-3-1 INDOOR UNIT CONTROL.................................................................................

1-4 AUTO CHANGEOVER OPERATION........................................................................

1-5 INDOOR FAN CONTROL.........................................................................................

1-6 OUTDOOR FAN CONTROL......................................................................................

1-7 COMPRESSOR CONTROL......................................................................................

1-8 TIMER OPERATION CONTROL...............................................................................

1-9 ELECTRONIC EXPANSION VALVE CONTROL......................................................

1-10 TEST OPERATION CONTROL...............................................................................

1-11 PREVENT TO START FOR 3 MINUTES (3 MINUTES ST)....................................

1-12 4-WAY VALVE EXTENSION SELECT....................................................................

1-13 AUTO RESTART.....................................................................................................

01-01
01-01
01-02
01-02
01-03
01-03
01-04
01-06
01-08
01-09
01-10

01-12
01-12
01-12
01-12
01-12

1-14 PUMP DOWN..........................................................................................................

1-15 COMPRESSOR PREHEATING...............................................................................

1-16 ECONOMY OPERATION........................................................................................

1-17 DEFROST OPERATION CONTROL.......................................................................

1-18 OFF DEFROST OPERATION CONTROL...............................................................

1-19 VARIOUS PROTECTIONS......................................................................................

1-20 COMPRESSOR STOP CONTROL..........................................................................

1-21 FRESH AIR CONTROL...........................................................................................

1-22 EXTERNAL ELECTRICAL HEATER CONTROL....................................................

1-23 LOW NOISE OPERATION......................................................................................

1-24 PEAK CUT OPERATION.........................................................................................

1-25 DESCRIPTION OF DISPLAY UNIT.........................................................................

2. TROUBLE SHOOTING

2-1 ERROR DISPLAY......................................................................................................

2-1-1 INDOOR UNIT AND WIRED REMOTE CONTROLLER DISPLAY.....................

2-2 TROUBLE SHOOTING WITH ERROR CODE..........................................................

2-3 TROUBLE SHOOTING WITH NO ERROR CODE....................................................

01-13
01-14
01-14
01-14

01-16
01-17
01-20
01-20
01-21
01-21
01-22
01-23

02-01
02-01

02-03
02-29

2-4 SERVICE PARTS INFORMATION............................................................................

3. DISASSEMBLY PROCESS

02-34

DUCT type

AMP Air Conditioning

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INVERTER

R410A

1 . DESCRIPTION OF EACH
CONTROL OPERATION

1. DESCRIPTION OF EACH CONTROL OPERATION

AMP Air Conditioning

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1-1. COOLING OPERATION

1-1-1 COOLING CAPACITY CONTROL

A sensor (room temperature thermistor) built in the indoor unit will usually perceive
difference or variation between a set temperature and present room temperature, and
controls the operation frequency of the compressor.
* If the room temperature is 2°C higher than a set temperature,
the compressor operation frequency will attain to maximum performance.

* If the room temperature is 2°C lower than a set temperature, the compressor
will be stopped.

* When the room temperature is between +2°C to -2°C of the setting temperature,
the compressor frequency is controlled within the range shown in Table1.
However, the maximum frequency is limited in the range shown in Fig.1 based on the
fan speed mode and the outdoor temperature.

( Table 1 : Compressor Frequency Range )

minimum
frequency

maximum
frequency

AO* G60LATT

15rps 78rps

( Fig. 1 : Limit of Maximum Frequency based on Outdoor Temperature )

When the room

temperature rises
Outdoor air
temperature

34°C

30°C

19°C

10°C

0°C

When the room
temperature drops

A zone

B zone

C zone

D zone

E zone

F zone

36°C

32°C

21°C

12°C

2°C

Fan speed mode

AO* G60LATT

A zone
B zone
C zone
D-F zone

Hi Me Lo

78rps
78rps
67rps
59rps

67rps
67rps
59rps
55rps

59rps
59rps
52rps
47rps

01-01

1-2. HEATING OPERATION

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1-2-1 HEATING CAPACITY CONTROL

A sensor (room temperature thermistor) built in the indoor unit will usually perceive
difference or variation between a set temperature and present room temperature, and
controls the operation frequency of the compressor.
* If the room temperature is lower 3°C than a set temperature,
the compressor operation frequency will attain to maximum performance.

* If the room temperature is higher 2°C than a set temperature, the compressor
will be stopped.

* When the room temperature is between +2°C to -3°C of the setting temperature,
the compressor frequency is controlled within the range shown in Table2.

( Table 2 : Compressor Frequency Range )

minimum
frequency

maximum
frequency

AO* G60LATT

18rps 85rps

01-02

1-3. DRY OPERATION

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1-3-1 INDOOR UNIT CONTROL

The compressor rotation frequency shall change according to set temperature and room
temperature variation which the room temperature sensor of the indoor unit has detected
as shown in the Table 3.

( Table 3 : Compressor frequency )

Operating
frequency

X zone

AO* G60LATT

J zone
Y zone

( Fig.2 : Compressor Control based on Room Temperature )

41rps

0rps

When the room
temperature drops

X zone

Ts+0.5°C

J zone

Ts-1.5°C

Y zone

( Fig.3 : Indoor Fan Control )

Compressor

ON

OFF

Setting air flow

Lo

S-Lo

When the room
temperature rises

Ts+1.5°C

Ts-0.5°C

Ts : Setting temperature

OFF

10 30 60 360 120 360 120 10 30 (sec)

01-03

1-4. AUTO CHANGEOVER OPERATION

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When the air conditioner is set to the Auto mode by remote controller, operation starts in the optimum
mode from among the Heating, Cooling, Dry and Monitoring mode. During operation, the
optimum mode is automatically switched in accordance with temperature changes. The temperature
can be set between 18°C and 30°C in 1°C steps.

When operation starts, indoor fan is operated for around 2 minutes.

1

Room temperature and outdoor temperature are sensed, and the operation mode is selected
in accordance with the table below. <Monitoring mode>

( Table 4 : Operation mode selection table )

Room temperature (TR)

Operation mode

TR : Room temperature
Ts : Setting temperature

TR> Ts+2°C

Ts+2°C TR Ts -2°C

TR < Ts -2°C Heating

Cooling

(Automatic dry)

*Middle zone

*If it's Middle zone, operation mode of indoor unit is selected as below.

(1). Same operation mode is selected as outdoor unit.

If outdoor unit is operating in Cooling, Dry, and Heating mode,
indoor unit will be operated by the same operation mode.

(2). Selected by the outdoor temperature.

If outdoor unit is operating in other than Cooling, Dry, and Heating mode, indoor unit will be operated
according to the outdoor temperature as below.

( Fig. 4 : Outdoor temperature zone selection )

Cooling mode

25°C

Heating mode

2

When Cooling or Dry mode was selected at and air flow mode is Auto, the air conditioner operates as follow.

The same operation as COOLING OPERATION AND DRY OPERATION of page 01-01 is performed.
When the room temperature has remained at set temperature -1.5°C, operation is automatically
switched to Dry mode.
If the room temperature reaches set temperature +2°C during Dry mode, operation returns to Cooling.

1

( Fig.5 : Auto changeover : Cooling - Dry )

( Air flow mode : Auto )

Ts +1°C

Ts -1.5°C

Ts -2.5°C

When the room
temperature drops

3

When Heating was selected at , the same operation as HEATING OPERATION of page
01-02 is performed.

4

When the compressor was stopped for 6 consecutive minutes by the temperature control function
after the Cooling(Auto:Dry) or Heating mode was selected at above, operation is switched
to Monitoring and the operation mode is selected again.

Cooling

Cooling

Dry(J zone)

Compressor stop

1

Dry(X zone)

When the room
temperature rises

01-04

Ts +2°C

Ts -0.5°C

Ts -1.5°C

1

TR : Room temperature
Ts : Setting temperature

AUTO CHANGEOVER operation flow chart

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HEATING OPERATION

YES

START

Room temp.

Ts+2°C?

NO

Room temp.

Ts -2°C?

NO

Middle zone

Operation mode of

outdoor unit : Cooling or Dry?

YES

TS : Setting temperature

YES

COOLING (AUTO:DRY)

OPERATION

YES

YES

Thermostat remains

in OFF state for 6 minutes or

longer?

NO

System stops

or operation command other than

auto changeover operation?

NO

YES

YES

NO

Operation mode of

outdoor unit : Heating?

NO

Outdoor temperature

25°C?

NO

Thermostat remains

in OFF state for 6 minutes or

longer?

NO

System stops

or operation command other than

auto changeover operation?

NO

YES

YES

01-05

1-5. INDOOR FAN CONTROL

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1. Fan speed

( Table 5 : Standard of Indoor Fan Speed )

AR* G60LHTA
(Static pressure : 60Pa (Standard))

Operation
mode

Heating

Air flow
mode

Hi

Me

Lo

Intermittent

S-Lo

Fan
moter

1
2
1
2
1
2
1
2
1
2

Speed
(rpm)

1090
1050
900
860
780
740
420
380
420
380

Operation
mode

Cooling
Fan

Dry

Air flow
mode

Hi

Me

Lo

Intermittent

S-Lo

Auto

Intermittent

S-Lo

Fan
moter

1
2
1
2
1
2
1
2
1
2
1
2
1
2
1
2

Speed
(rpm)

1090
1050
900
860
780
740
420
380
420
380
780
740
420
380
420
380

2. FAN OPERATION

The airflow can be switched in 4 steps such as Auto, Lo, Me, Hi, while the indoor fan only runs.
When [Auto] is selected, the indoor fan motor runs Me.

3. COOLING OPERATION

Switch the airflow [Auto], and the indoor fan motor will run according to a room temperature,
as shown in Fig. 6.
On the other hand, if switched in [Hi] ~ [Lo], the indoor motor will run at a constant airflow of [Cool]
operation modes Lo, Me, Hi ,as shown in Table 5.

( Fig.6 : Airflow change - over ( Cooling : AUTO ) )

*1

When the room
temperature rises

TR : Room temperature
Ts : Setting temperature

TR-Ts > 2°C

=

2°C > TR-Ts > 1°C

=

1°C > TR-Ts

Hi mode

Me mode

Lo mode

When the room
temperature drops

TR-Ts > 2.5°C

=

2.5°C > TR-Ts > 1.5°C

1.5°C > TR-Ts

*1 : Contains a condition to the following

When the operation mode is set to Auto mode
at the start of operation.
When the setting temperature was changed.
When the operation mode was changed to Cooling mode.
When the airflow mode was changed to A

=

uto mode.

01-06

4. HEATING OPERATION

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Switch the airflow [Auto], and the indoor fan motor will run according to a room temperature,
as shown in Fig. 7.
On the other hand, if switched in [Hi] ~ [Lo], the indoor motor will run at a constant airflow
of [Heat] operation modes Lo, Me, Hi, as shown in Table 5.

( Fig.7 : Airflow change - over ( Heating : AUTO ) )

Indoor heat exchanger
temperature

TR-Ts > -1.0°C

=

1.0°C > TR-Ts > -2.0°C

=

-2.0°C > TR-Ts

Lo mode

Me mode

Hi mode

TR-Ts > -1.5°C

=

-1.5°C > TR-Ts > -2.5°C

-2.5°C > TR-Ts

=

5. COOL AIR PREVENTION CONTROL (Heating mode)

The maximum value of the indoor fan speed is set as shown in Fig. 8, based on the detected
temperature by the indoor heat exchanger sensor on heating mode.

( Fig.8 : Cool Air Prevention Control )

Indoor heat exchanger
temperature

Setting Fan mode

27°C

S-Lo mode

13 min. later

24°C

STOP

Indoor heat exchanger
temperature

Setting Fan mode

27°C

24°C

Lo

Lo

6. DRY OPERATION

Refer to the Fig. 3.
During the dry mode operation, the fan speed setting can not be changed.

7. DEFROST OPERATION

When the defrost operation starts, the indoor fan runs according to cool air preventtion control for 20 seconds.
And the fan is stopped if 20 seconds have passed.
When 60 seconds have passed after defrost operation is released,
the fan runs according to cool air preventtion control

01-07

1-6. OUTDOOR FAN CONTROL

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1. Outdoor Fan Motor

Following table shows the fan speed of the outdoor unit.

( Table 6 : Fan speed of the outdoor unit )

Cooling / Dry Heating

AO* G60LATT

The outdoor fan speed changes in the range mentioned above depending on the compressor

*

frequency and outdoor temperature.
(When the compressor frequency and outdoor temperature increase, the outdoor fan speed
also changes to the higher speed.
When the compressor frequency and outdoor temperature decrease, the outdoor fan
speed also changes to the lower speed.)

The compressor and the fan start-up at the same time, and the fan stops after the compressor

*

stops and 60 seconds has passed.
The fan doesn't operates fan 10 seconds after the fan stops.

*

After operating the defrost control function on heating mode except economy operation,

*

its speed becomes 900rpm(Upper/ Lower) regardless of the compressor speed.
However, it returns to the normal speed control when the defrosting operation does not function
for 240 minutes after releasing the defrost operation or when the outdoor temperature sensor
detection value becomes higher than 5℃.

It runs at 500rpm for 20 seconds after starting up the outdoor fan.

*

However, the fan operates at 200rpm when the initial rotation speed is 300rpm or less.

Upper fan
/Lower fan

900/800, 850/800, 780/750
520/520, 350/350, 280/280
480/ 0 , 400/ 0, 280/ 0

900/900, 870/840, 780/750
520/520, 350/350, 200/200
170/170, 150/150

01-08

1-7. COMPRESSOR CONTROL

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1. OPERATION FREQUENCY RANGE

The operation frequency of the compressor is different based on the operation mode as
shown in Table 7.

(Table 7 : Compressor Operation Frequency Range)

Cooling Heating

Min Max Min Max

Dry

AO* G60LATT

15rps

78rps

18rps

85rps

41rps

2. OPERATION FREQUENCY CONTROL AT START UP

The compressor frequency soon after the start-up is controlled as shown in Fig. 9.

(Fig.9 : Compressor Control at Start-up)

< Normal start-up >
Immediate start-up after power-ON (cooling)

(rps)

70

limit

54
40
28

(rps)

90

180 270 360 (sec)

Elapsed time

Upper
speed

Immediate start-up after power-ON (Heating Ta < 10°C)

70

limit

limit

54

25
16

30 120 300 650 (sec)

Elapsed time

=

(rps)

70

54
40

28
25

16

30 270 480 560 620 650 (sec)

Elapsed time

Upper
speed

Immediate start-up after power-ON (Heating Ta > 10°C)

Upper
speed

Ta : Outdoor temperature

01-09

1-8. TIMER OPERATION CONTROL

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AR-WAE1E

ON / TIMER
OFF / TIMER

WEEKLY TIMER

TEMPERATURE SET BACK TIMER

1. ON / OFF TIMER

OFF timer : When the clock reaches the set time, the air conditioner will be turned off.

Operation mode

Stop mode

Set time of timer

ON timer : When the clock reaches the set time, the air conditioner will be turned on.

Operation mode

Stop mode

Set time of timer

2. WEEKLY TIMER

2-1. WEEKLY TIMER

Use this timer function to set operating time for each day of the week.
The weekly timer allows up to two ON and OFF time to set up per day.

Operation mode

Stop mode

Set time

The operating time can be set in 30 min increments only.
The OFF time can be carried over to next day.
The ON timer and the OFF timer functions cannot be set with using the weekly timer.

Both ON and OFF time must be set.

Operation mode

Stop mode

Set time Set time Set time

Operation mode

Stop mode

01-10

2-2. DAY OFF setting

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The DAY OFF setting is only available for days for which weekly settings already exist.
If the operating time carries over to the next day (during a next day setting), the effective

DAY OFF range will be set as shown below.

Normal

DAY OFF

Operation mode

Operation mode

Stop mode

Stop mode

Preceding day Next day

Setting day

Stop mode

Next day setting

DAY OFF

Stop mode

Operation mode

Stop mode

Preceding day Next daySetting day

Operation mode

Stop mode

The DAY OFF setting can only be set one time. The DAY OFF setting is cancelled automatically
after the set day has passed.

3. TEMPERATURE SET BACK TIMER

The SET BACK timer only changes the set temperature for 7 days, it cannot be used to start or stop
air conditioner operation.

The SET BACK timer can be set to operate up to two times per day but only one temperature setting
can be used.

During the COOL/DRY mode, the air conditioner will operate at a minimum of 18°C even if
the SET BACK temperature is set to 17°C or lower.

Case of SET BACK timer on the Cooling operation.
( Setting temperature :22°C, SET BACK temperature :26°C)

SET BACK setting

Operation
temperature

*1

Operation
temperature

*1: During the SET BACK function,
the setting temperature is changed.

ON OFF OFFON

26°C

22°C
26°C

24°C
22°C

Change the setting temperature:
22°C 24°C

01-11

1-9. ELECTRONIC EXPANSION VALVE CONTROL

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The most proper opening of the electronic expansion valve is calculated and controlled under the
present operating condition based on the following values.
The compressor frequency, the temperatures detected by the discharge temperature sensor
and the outdoor temperature sensor.

The pulse range of the electronic expansion valve control is
50~ 480 pulses (Cooling), 40~ 480 pulses (Heating).

At the time of supplying the power to the outdoor unit, the initialization of the electronic
expansion valve is operated (528 pulses are input to the closing direction).

1-10. TEST OPERATION CONTROL

With Wired Remote Controller

Under the condition where the air conditioner stops, press the MASTER CONTROL button and
the FAN CONTROL button simultaneously for 2 seconds or more, and the test operation control
mode will appear.
During test running, " " will display on the remote controller display.
Set the test operation mode, and the compressor will continue to run regardless of whatever
the room temperature sensor detects.
The test operation mode is released if 60 minutes have passed after setting up the test operation.

1-11. PREVENT TO RESTART FOR 3 MINUTES ( 3 MINUTES ST )

The compressor won't enter operation status for 3 minutes after the compressor is stopped,
even if any operation is given.

1-12. 4-WAY VALVE EXTENSION SELECT

At the time when the air conditioner is switched from the cooling mode to heating mode,
the compressor is stopped, and the 4-way valve is switched in 3 minutes later
after the compressor stopped.

1-13. AUTO RESTART

When the power was interrupted by a power failure, etc. during operation, the operation contents
at that time are memorized and when power is recovered, operation is automatically resumed with
the memorized operation contents.
When the power is interrupted and recovered during timer operation, timer operation is canceled,

but only setting time is memorized.

[Operation contents memorized when the power is interrupted]

Operation mode
Set temperature

Set air flow

Timer mode and timer time (set by wireless remote controller)

ECONOMY operation

01-12

1-14. PUMP DOWN

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Operate [PUMP DOWN] switch on the display board.

< PUMP DOWN Procedure >

(1) Confirm that power is off, and open the service panel.
(2) Turn the power on.

: Light ON: Light OFF

TEST

POWER

ERROR

MODE

(3) Press [PUMP DOWN] switch for 3 seconds or more after 3 minutes after power on.

POWER

ERROR

MODE

LED display lights on as shown in the above figure, and the fans and the compressor start operating.
If the [PUMP DOWN] switch is pressed while the compressor is operating, the compressor will stop then

start again in about 3 minutes.

(4) LED display will change as shown as below about 3 minutes after the compressor starts.
Fully close the 3-way valve on the liquid pipe side at this stage.

POWER

ERROR

MODE

PUMP

RUN

(L1) (L2) (L3) (L4) (L5) (L6) (L7)

TEST

RUN

(L1) (L2) (L3) (L4) (L5) (L6) (L7)

TEST

RUN

(L1) (L2) (L3) (L4) (L5) (L6) (L7)

LOW NOISE PEAK CUT

DOWN

PUMP

LOW NOISE PEAK CUT

DOWN

PUMP

LOW NOISE PEAK CUT

DOWN

(5) When LED display changes as shown in the below figure, close the 3-way valve on the gas pipe side tightly.

TEST

POWER

ERROR

MODE

Closing direction

PUMP

RUN

(L1) (L2) (L3) (L4) (L5) (L6) (L7)

Step (4)

LOW NOISE PEAK CUT

DOWN

Step (5)

Closing direction

Hexagon wrench

Liquid pipe

Gas pipe

(6) LED display changes after 1 minute as shown in the figure below.

TEST

POWER

MODE

ERROR

PUMP

RUN

(L1) (L2) (L3) (L4) (L5) (L6) (L7)

LOW NOISE PEAK CUT

DOWN

Fans and compressor stop automatically.

(7) Turn the power off.

TEST

POWER

MODE

ERROR

PUMP

RUN

(L1) (L2) (L3) (L4) (L5) (L6) (L7 )

LOW NOISE PEAK CUT

DOWN

PUMP DOWN is completed.

01-13

1-15. COMPRESSOR PREHEATING

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When the outdoor temperature is lower than 20°C and the all operation mode has been
stopped for 30 minutes, power is applied to the compressor and the compressor is heated.
(By heating the compressor, warm air is quickly discharged when operation is started.)
When operation was started and when the outdoor temperature rises to 26°C or greater,
preheating is ended.

1-16. ECONOMY OPERATION

The ECONOMY operation functions by pressing ECONOMY button on the remote controller.
The ECONOMY operation is almost the same operation as below settings.

( Table9 )

Mode Cooling/ Dry Heating
Target temperature Setting temp.+1°C Setting temp.-1°C

1-17. DEFROST OPERATION CONTROL

1. CONDITION OF STARTING THE DEFROST OPERATION

The defrost operation starts as shown in the following Table 10, 11, and 12.

( Table 10 : Condition of 1st defrost operation)

Compressor integrating operation time

1st defrost

after

starting operation

( Table 11 : Condition of 2nd defrost operation)

From 2nd and later

defrost after

starting operation

( Table 12 : Condition of Integrating defrost operation)

Integratingdefrost

(Constant monitoring)

Less than 22 minutes More than 22 minutes More than 62 minutes

Does not operate

Compressor integrating operation time

Less than 35 minutes More than 35 minutes

Does not operate

Compressor integrating operation time

More than 240 minutes

( For long continuous operation )

Outdoor heat exchanger temperature

Below -3°C

Outdoor heat exchanger temperature

Outdoor heat exchanger temperature

Below -9°C

Outdoor heat exchanger temperature

Below -10°C

Less than 10 minutes

( For intermittent operation )

OFF count of the compressor

40 times

Below -5°C

If the compressor continuous operation time is less than 10 minutes,
the OFF number of the compressor is counted.
If any defrost operated, the compressor OFF count is cleared.

2. CONDITION OF THE DEFROST OPERATION COMPLETION

Defrost operation is released when the conditions becomes as shown in Table 13.

( Table 13 : Condition of defrost release )

Outdoor heat exchanger temperature is higher than 10°C
or
Compressor operation time has passed 15 minutes.

Release Condition

01-14

3. Defrost Flow Chart

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The defrosting shall proceed by the integrating operation time, outdoor temperature
and outdoor heat exchanger temperature as follows.

Heating operation start : Compressor ON

(Not defrosted for 10 minutes)

1st defrost

Compressor
integrating
operation:
Over 22 minutes

Outdoor
heat exchanger
temperature:
Below - 9°C

Compressor
integrating
operation:
Over 62 minutes

Outdoor
heat exchanger
temperature:
Below - 5°C

2nd and later defrost

Compressor
integrating
operation:
Over 35 minutes

Outdoor
heat exchanger
temperature:
Below - 10°C

Defrost start

Defrost Indicator:
[Operation lamp]
7 sec ON / 2 sec OFF

Integrating defrost

(Constant monitoring)

Compressor
OFF count :
40 times

Compressor
integrating
operation:
Over 240 minutes

Outdoor
heat exchanger
temperature:
Below - 3°C

Compressor : OFF
Outdoor fan motor : OFF
30 sec later 4-way valve : OFF
36 sec later compressor : ON

Outdoor heat exchanger temperature: Over 10°C

or

Compressor ON time: Maximum 15 minutes

Defrost end

01-15

1-18. OFF DEFROST OPEARTION CONTROL

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When operation stops in the [Heating operation] mode, if frost is adhered to the outdoor unit heat
exchanger, the defrost operation will proceed automatically. In this time, if indoor unit operation
lamp flashes slowly (7 sec ON / 2 sec OFF), the outdoor unit will allow the heat exchanger to defrost,
and then stop.

1. OFF DEFROST OPERATION CONDITION

In heating operation, the outdoor heat exchanger temperature is less than -4°C,
and compressor operation integrating time lasts for more than 30 minutes,
and and compressor operation contiguous time lasts for more than 10 minutes.

2. OFF DEFROST RELEASE CONDITION

OFF defrost operation is released when the conditions becomes as shown in Table 14.

( Table 14 : OFF Defrost Release Condition )

Release Condition

Outdoor heat exchanger temperature is higher than 10°C
or
Compressor operation time has passed 15 minutes.

OFF Defrost Flow Chart

Heating operation stop

Outdoor heat exchanger temperature :
Below -4°C.
and
Compressor integrating operation :
Over 30 minutes.
and
Compressor contiguous operation:
Over 10 minutes.

Defrost Indicator:
[Operation lamp]
7 sec ON / 2 sec OFF

Defrost start

Outdoor heat exchanger temperature : Over 10°C

Compressor ON time : Maximum 15 minutes

or

Defrost end

01-16

1-19. VARIOUS PROTECTIONS

AMP Air Conditioning

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1. DISCHARGE GAS TEMPERATURE OVERRISE PREVENTION CONTROL

The discharge gas thermosensor (discharge thermistor : Outdoor side) will detect discharge gas
temperature.

When the discharge temperature becomes higher than Temperature ,the compressor frequency
is decreased 10rps, and it continues to decrease the frequency for 10rps every 120 seconds until
the temperature becomes lower than Temperature .

When the discharge temperature becomes lower than Temperature , the control of
the compressor frequency is released.

When the discharge temperature becomes higher than Temperature ,the compressor is stopped
and the indoor unit LED starts blinking.

(Table15 : Discharge Temperature Over Rise Prevention Control / Release Temperature)

Temperature

105°C 100°C 115°C

Temperature

Temperature

01-17

2. CURRENT RELEASE CONTROL

AMP Air Conditioning

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The compressor frequency is controlled so that the outdoor unit input current does not exceeds
the current limit value that was set up with the outdoor temperature.
The compressor frequency returns to the designated frequency of the indoor unit at the time
when the frequency becomes lower than the release value.

(Table 16 : Current Release Operation Value / Release Value)

[ Heating ]

Outdoor unit fan speed (UP / LO)

(Control / Release)

20°C < Ta

=

16°C < Ta < 20°C

=

12°C < Ta < 16°C

=

5°C < Ta < 12°C

=

Ta < 5°C

Ta : Outdoor Temperature

[ Cooling ]

50°C < Ta

=

46°C < Ta < 50°C

=

43°C < Ta < 46°C

=

40°C < Ta < 43°C

=

38°C < Ta < 40°C

=

31°C < Ta < 38°C

=

25°C < Ta < 31°C

=

19°C < Ta < 25°C

=

13°C < Ta < 19°C

=

7°C < Ta < 13°C

=

0°C < Ta < 7°C

=

-5°C < Ta < -0°C

=

-10°C < Ta < -5°C

=

-15°C < Ta < -10°C

=

Ta < -15°C

Ta : Outdoor Temperature

900/900rpm

900/800rpm 780/750rpm850/800rpm

4.8A/4.3A

6.0A/5.5A

7.3A/6.8A

7.8A/7.3A

8.5A/8.0A

870/840rpm 780/750rpm 520/520rpm 350/350rpm 200/200rpm 170/170rpm 150/150rpm

7.8A/7.3A 6.5A/6.0A

8.5A/8.0A

4.8A/4.3A

6.0A/5.5A

7.3A/6.8A

8.0A/7.5A

8.5A/8.0A

Outdoor unit fan speed (UP / LO)

520/520rpm 350/350rpm 280/280rpm 480/ 0rpm 400/ 0rpm 280/ 0rpm

4.8A/4.3A 3.0A/2.5A

3.3A/2.8A

4.0A/3.5A

4.2A/3.7A

5.0A/4.5A

7.8A/7.3A

5.0A/4.5A

5.5A/5.0A

6.7A/6.2A

7.8A/7.3A

3.0A/2.5A

4.5A/4.0A

6.5A/6.0A

2.8A/2.3A

3.8A/3.3A

4.8A/4.3A

7.8A/7.3A

2.8A/2.3A

3.5A/3.0A

3.8A/3.3A

4.3A/3.8A

4.8A/4.3A

(Control / Release)

2.8A/2.3A

3.3A/2.8A

3.8A/3.3A

4.3A/3.8A

4.8A/4.3A

5.3A/4.8A

2.0A/1.5A

2.8A/2.3A

3.5A/3.0A

3.8A/3.3A

4.3A/3.8A

01-18

3. ANTIFREEZING CONTROL (Cooling and Dry mode)

AMP Air Conditioning

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The compressor frequency is decrease on cooling & dry mode when the indoor heat exchanger
temperature sensor detects the temperature lower than Temperature .
Then, the anti-freezing control is released when it becomes higher than Temperature .

(Table 17 : Anti-freezing Protection Operation / Release Temperature)

Outdoor temperature

Over than 10°C *1

or 12°C *2

Less than 10°C *1

or 12°C *2

Temperature Temperature

7°C

4°C

13°C

*1. When the temperature rises.
*2. When the temperature drops.

4. COOLING PRESSURE OVER RISE PROTECTION

On cooling mode, the compressor frequency is controlled as following based on the
detection value of the outdoor heat exchanger temperature sensor.

(Fig.10 : Cooling Pressure Over Rise Protection Control)

Outdoor heat exchange
temperature

Compressor is OFF

68°C

The compressor frequency is
decreased 5rps every 120seconds.

63°C

Release of protection

5. LOW PRESSURE PROTECTION CONTROL (For Cooling mode)

5-1. Low Pressure Protection 1

<After the compressor start-up and 1 minute has passed>
(a).The detected value of pressure sensor is 0.02MPaG or less,

continues for 5 minutes, the compressor is stopped.
(b). When 7 minutes has passed and low pressure sensor detects
value is more than 0.05MPaG after the protection stop by (a),
the compressor restarts.
(c).When the protection (a) operates 5 times within 2 hours after the
restart by (b),
the error is displayed and the compressor stops. [Permanent stop]

(Fig 11 : Low pressure protection 1)

Pressure

0.05MPaG

0.02MPaG

Release of protection

Hold

Compressor stop

5-2. Low Pressure Protection 2
<After the compressor start-up and 10 minutes has passed>

(a).When the low pressure value becomes 0.68MPaG or less
continues for 1 minute, the compressor speed -8 rps.

(b). When the low pressure value becomes 0.68MPaG or less
after the protection (a), the compressor continues speed -8 rps

every 1 minute until the detected value becomes more than

0.68MPaG.
(c). When the low pressure value becomes more than 0.78MPaG,
this protection is released.

01-19

(Fig 12 : Anti freezing protection)

Pressure

0.78MPaG

0.68MPaG

Release of protection

Hold

-8 rps every 1 minute

6. HEATING OVERLOAD PROTECTION

AMP Air Conditioning

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On heating mode, the compressor frequency is controlled as following based on the
detection value of the pressure sensor.

(Fig.13 : Heating Overload Protection Control)

Condensing pressure
(Indoor heat ex. temp.)

Compressor is OFF

4.1MPa
(65°C)

3.3MPa
(55°C)

3.0MPa
(50°C)

2.8MPa
(48°C)

The compressor frequency is
decreased 7rps every 60 seconds.

The compressor frequency is
decreased 1rps every 60 seconds.

Release

Release

Stable range

1-20. COMPRESSOR STOP CONTROL

When the detection value of outdoor temperature sensor is lower than temperature
in the table below, the compressor is stopped.

(Table 18 : Operation temperature of compressor stop control)

Temperature

Operation
temperature

Cooling

- 20°C

Heating

1-21. FRESH AIR CONTROL

The fan motor for Fresh Air is operated in synchronization with the indoor fan operation
as shown in Fig.14.

(Fig.14 : Fresh Air control)

Fan motor
(Indoor unit)

Control signal
(for Fresh Air)

ON
OFF

ON
OFF

12V

01-20

1-22. EXTERNAL ELECTRICAL HEATER CONTROL

AMP Air Conditioning

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The External Electrical Heater operates when it meets all the following conditions.

Model type : Heat pump
Operation mode : Heating mode
Compressor : ON
Indoor fan : ON

(Fig 15 : External Electrical Heater control)

When the room
temperature rises

Heater : OFF

Ts -3°C

Heater : ON

Ts -12°C

Heater : OFF

When the room
temperature drops

Ts -1°C

Ts -10°C

Ts : Setting temperature

1-23. LOW NOISE OPERATION

The compressor speed and the outdoor unit fan speed are limited to reduce the operation noise
by External Input.

During the LOW NOISE OPERATION,
"CURRENT OVERLOAD OPERATION", "ECONOMY OPERATION" and "PEAK CUT OPERATION"
are effective, and the outdoor unit operates by lowest current of them.

However, during the DEFROST OPERATION, the compressor operates by the speed
for DEFROST OPERATION.

( Table 19 : Detail of Low Noise Operation )

Low Noise mode

Cooling

Outdoor Fan
Upper Limit Speed
( rpm )

520

Compressor
Speed ( rps )

58

LEVEL 1

Heating
Cooling

520
520

58
37

LEVEL 2

Heating
Cooling

520
520

39
27

LEVEL 3

Heating

520

33

*The performance drops when operating in the LOW NOISE OPERATION.

01-21

1-24. PEAK CUT OPERATION

AMP Air Conditioning

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The Current Value is limited to reduce the power consumption by External Input.

During the PEAK CUT OPERATION,
"CURRENT OVERLOAD OPERATION", "ECONOMY OPERATION" and "LOW NOISE OPERATION"
are effective, and the outdoor unit operates by lowest current of them.

However, this function becomes invalid during DEFROST OPERATION.
(Table 20 : Outline of Peak Cut Operation )

PEAK CUT LEVEL

Peak Cut

For Rated Capacity

LEVEL 1 LEVEL 2 LEVEL 3 LEVEL 4

Forced

thermostat-OFF

75%50%

*Percentage is rated electrical power ratio.

100%

01-22

1-25. DESCRIPTION OF DISPLAY UNIT

AMP Air Conditioning

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1-25-1 Layout of Display Unit

•

Various settings can be adjusted by changing Dip switches and Push switches on the board of the outdoor unit.
( Excerpt from the "INSTALATION MANUAL" )

LED DISPLAY

(1) (2) (3) (4) (5) (6)

SW1 (DIP-SW) SW2 SW3 SW4 SW5 SW6

PUSH SWITCH

Display lamp

(1) POWER / MODE

(2) ERROR

(3) TEST RUN (L1) Orange Lights on during test operation.

(4) PUMP DOWN (L2)
(5) LOW NOISE MODE

(L3, L4)
(6) PEAK CUT

(L5, L6, L7)

Switch

MODE

SELECT

Green

Red

Orange

Orange

Orange

SW1DIP-SWITCH

SW2 To switch between “Local setting” and “Error code display”.

SW3

Function or operation method

Lights on while power on Local setting in outdoor unit
or error code is displayed with blink.

Blinks during abnormal air-conditioner operation.
Number of blinks indicates kind of error and error code is displayed.

Lights on during pump down operation.
Lights on during “Low noise” function when local setting is activated.

(Lighting pattern of L3 and L4 indicates low noise level)
Lights on during “Peak cut” function when local setting is activated.

(Lighting pattern of L5, L6 and L7 indicates peak cut level)

Function or operation method

For selecting COOLING or HEATING during test operation.
Positions 2 to 4 of Dip switch are not used.

To switch between the individual “Local settings” and the
“Error code displays”.

ENTER / TEST RUN

EXIT / INITIALIZE

PUMP DOWN

•

Dip switches 1 to 4 at shipment from the factory are set as follows.

1 2 3 4

COOL OFF OFF OFF

SW4

SW5

SW6 To start the pump down operation.

DIP switch

To fix the individual “Local settings ” and the “Error code displays”.

EXIT

01-23

1-25-2 Display mode

AMP Air Conditioning

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•

In this mode, the "Operation Condition" and "Error Code" can be displayed by Push Switch on outdoor unit PCB

(Table :21 Display pattern)

NO.

1

2

Power / Mode

LED

Present Value
Of
Each Item

1

Error Code

2

Display Item

LED

L1 L2 L3 L4
Compressor frequency
Upper fan speed (Outdoor unit)
Lower fan speed (Outdoor unit)
EEV pulse
Pressure sensor value (Low pressure range)
Pressure sensor value (High pressure range)
Outdoor air temperature sensor value
Discharge temperature sensor value
Heat-exchanger temperature sensor value (Middle)
Current value
Compressor accumulated time
Newest error code
Error code before 1 time
Error code before 2 times

(Table :22 Procedure for Present Value)

Procedure

1

2

3

4

During status display, press the MODE SWITCH 1 time.
(Status display : Outdoor unit is stopping and no error)

When the POWER / MODE LED blinking 1 time,
press the ENTER SWITCH.

Press the SELECT SWITCH and adjust to DISPLAY ITEM
(from L1 to L4) that you want to confirm. (Refer to Table 17)

Press the ENTER SWITCH.
(Data is displayed by lighting LED. Refer to Table : 19)

Selecting display items can be done by pressing
the SELECT SWITCH. (Return to Procedure 3)

Operation

5

When the EXIT SWITCH is pressed, this mode ends
and returns to the status display.

: Light ON: Light OFF n : n Time Blinking

Power
Mode

Error L1 L2 L3 L7L6L5L4

1

1

1

1

1

: Light ON: Light OFF : Blinking

: Blinking

DATA

1 : 1 Time Blinking

01-24

(Table 23 : Detail of LED Display Data)

AMP Air Conditioning

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: Light ON: Light OFF 1 : 1 Time Blinking

Item No,

1

2

3

4

5

6

Display Item

Compressor
Frequency
( 0 ~ 95rps )

Outdoor Unit
Upper Fan Speed
( 0 ~ 900rpm )

Outdoor Unit
Lower Fan Speed
( 0 ~ 900rpm )

EEV Pulse
( 0 ~ 480pulse )

Pressure sensor value
<Low pressure range>
( 0 ~ 2.1MPa )

Check the High Pressure
Range if it is displayed
[ 1.81 ~ 2.1 ]

Pressure sensor value
<High pressure range>
( 2.1 ~ 4.2MPa )

Check the Low Pressure
Range if it is displayed
[ ~ 2.1 ]

0
1 ~ 15
16 ~ 30
31 ~ 45
46 ~ 60
61 ~ 75
76 ~ 90
90 ~ 95

0
1 ~ 150
151 ~ 300
301 ~ 450
451 ~ 600
601 ~ 750
751 ~ 900
901 ~
0
1 ~ 150
151 ~ 300
301 ~ 450
451 ~ 600
601 ~ 750
751 ~ 900
901 ~
0
1 ~ 80
81 ~ 160
161 ~ 240
241 ~ 320
321 ~ 400
401 ~ 480
481 ~

~ 0.0

0.01 ~ 0.3

0.31 ~ 0.6

0.61 ~ 0.9

0.91 ~ 1.2

1.21 ~ 1.5

1.51 ~ 1.8

1.81 ~ 2.1
~ 2.1

2.11 ~ 2.4

2.41 ~ 2.7

2.71 ~ 3.0

3.01 ~ 3.3

3.31 ~ 3.6

3.61 ~ 3.9

3.91 ~ 4.2

Power
Mode

1
1
1
1
1
1
1
1

1
1
1
1
1
1
1
1

1
1
1
1
1
1
1
1

1
1
1
1
1
1
1
1

1
1
1
1
1
1
1
1

1
1
1
1
1
1
1
1

Error L1 L2 L3 L7L6L5L4

01-25

: Light ON: Light OFF 1 : 1 Time Blinking

AMP Air Conditioning

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Item No,

7

8

9

10

11

Display Item

Outdoor Air
Temperature
( -30 ~ 70°C )

Discharge
Temperature
( -30 ~ 120°C )

Heat-exchanger
Temperature
<Middle>
( -30 ~ 80°C )

Current
( 0 ~ 10A )

Compressor
Accumulated Time
( H )

<Round up by 1 hour>

~ -15

-15 ~ -5

-5 ~ 5
5 ~ 15
15 ~ 25
25 ~ 35
35 ~ 45

45 ~
~ 55
55 ~ 65
65 ~ 75
75 ~ 85
85 ~ 95
95 ~ 105
105 ~ 115
115 ~
~ 53
53 ~ 55
55 ~ 57
57 ~ 59
59 ~ 61
61 ~ 63
63 ~ 65
65 ~

~ 0.0

0.0 ~ 1.5

1.5 ~ 3.0

3.0 ~ 4.5

4.5 ~ 6.0

6.0 ~ 7.5

7.5 ~ 9.0

9.0 ~
0
0 ~ 10000
10000 ~ 20000
20000 ~ 30000
30000 ~ 40000
40000 ~ 50000
50000 ~ 60000
60000 ~

Power
Mode

1
1
1
1
1
1
1
1

1
1
1
1
1
1
1
1

1
1
1
1
1
1
1
1

1
1
1
1
1
1
1
1

1
1
1
1
1
1
1
1

Error L1 L2 L3 L7L6L5L4

01-26

1-25-3 Error history mode

AMP Air Conditioning

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•

In this mode, the history of abnormality that occurred in the past can be confirmed.

(Table : 24 Procedure for History Mode )

Procedure Operation

1

2

3

4

During status display, press the MODE SWITCH 2 times.
(Status display : Outdoor unit is stopping and no error)

When the POWER / MODE LED blinking 2 times,
press the ENTER SWITCH.

Press the SELECT SWITCH and adjust to DISPLAY ITEM
(from L1 to L4) that you want to confirm. (Refer to Table : 17)

Press the ENTER SWITCH, Error code is displayed by
lighting LED. (Refer to Table : 21)

Power
Mode

2

2

2

2

Error L1 L2 L3 L7L6L5L4

n n

: Light ON: Light OFF

Note.
Selecting display items can be done by pressing the SELECT SWITCH. (Return to Procedure 3)
When the EXIT SWITCH is pressed, this mode ends and returns to the status display.

(Table : 25 Error Code)

TEST

POWER

MODE

2

ERROR

PUMP

RUN

DOWN

(L1) (L2) (L3) (L4) (L5) (L6) (L7)

1 1

2 2
5 15
6 1

7 1

8 4

9 4

10 1

LOW NOISE PEAK CUT

2

3
4

5
8

2
3

4
7

6

5

7
8
9

3
5

: Blinking 2 : 2 Times Blinking

: Light ON

Serial forward transmission error immediately after operation
Serial forward transmission error during operation
Indoor unit capacity error
Indoor unit error
Over voltage
Power supply frequency error
Outdoor unit PCB model information error
PFC communication error
Inverter error
PFC AD detection error
PFC hardware error
IPM error (Trip terminal L error)
Rush current limiting resister temp rise protection
Discharge temp. sensor error
Compressor temp. sensor error
Heat Ex. middle temp. sensor error
Outdoor unit Heat Ex. liquid temp. sensor error
Outdoor temp. sensor error
Heat sink temp. sensor error
PFC heat sink temp. sensor error
Current sensor 1 error (stoppage permanently)
High pressure switch 1 error
Pressure sensor error
Trip detection (stoppage permanently)
Compressor motor control error (stoppage permanently)
Compressor motor loss of synchronization (stoppage permanently)
Outdoor unit fan motor 1 error (Duty error)
Outdoor unit fan motor 2 error (Duty error)
4-way valve error
Discharge temp. 1 error (stoppage permanently)
Compressor 1 temp. error (stoppage permanently)
Low pressure error

n : n Times Blinking

1 ~ : 1~ 15 Times Blinking 15

Description

01-27

1-25-4 ERROR CHECK MODE

AMP Air Conditioning

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•

In this mode, abnormality that is occurring now can be confirmed.

(Table : 26 Procedure for Error Check Mode )

: Light ON: Light OFF 2 : 2 Times Blinking

Procedure Operation

1

2

3

Note.
When the EXIT SWITCH is pressed, this mode ends and returns to the status display.

Check that the "ERROR" LED blinking (Hi-speed),
and then short press the ENTER SWITCH 1 time.

Error code is displayed by lighting LED.
(Refer to Table : 21)

When the MODE SWITCH is pressed for more than
3 seconds, the Error history is cleared.

Power
Mode

Error L1 L2 L3 L7L6L5L4

Blinking
Hi-speed

2

2 2 2 2 2 2 2 2 2

Confirm Chapter 2 " TROUBLE SHOOTING" in detail.

n : n Times Blinking

n n

01-28

AMP Air Conditioning

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DUCT type

AMP Air Conditioning

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INVERTER

R410A

2 . TROUBLE SHOOTING

2-1 ERROR DISPLAY

AMP Air Conditioning

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2-1-1 INDOOR UNIT AND WIRED REMOTE CONTROLLER DISPLAY

1. SELF - DIAGNOSIS

When "Er" in Temperature Display is displayed, inspection of the air conditioning system is necessary.
Please consult authoilzed service personnel.

Unit number (usually 0)

Error code

SUMOTUWETH FR

ex. Self-diagnosis check

SA

Error Contents

Serial Communication Error
Wired Remote Controller

Communication Error
Fan Motor Driving Circuit Error

Indoor Room Thermistor Error

Indoor Heat Ex. Thermistor Error

Indoor Unit Fan Motor1 Error

Drainage Error

Indoor Unit Fan Motor2 Error

Indoor Unit Error

Inverter Error

Error
Code

11

12

39

41

42

51

53

59

5U

63

Trouble
shooting

1,2

3

4

5

6

7

8

9

1- 9

10

Error Contents

Current sensor Error

Pressure sensor Error

Over Current Error

Compressor Control Error

Outdoor Unit Fan Motor 1 Error

Outdoor Unit Fan Motor 2 Error

4-way Valve Error

Discharge Temp. Error

Compressor Temp. Error

Low Pressure Error

Error
Code

84

86

94

95

97

98

99

A1

A3

A5

Trouble
shooting

17

18

19

20

21

22

23

24

25

26

IPM Error

Discharge Thermistor Error

Compressor Thermistor Error

Heat Ex. Liquid Temp.
Thermistor Error

Outdoor Thermistor Error

Heat Sink Thermistor Error

65

71

72

73

74

77

11

12

13

14

15

16

02-01

2. ERROR CODE HISTORY DISPLAY

AMP Air Conditioning

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Up to 16 memorized error codes may be displayed for the indoor unit connected to the remote controller.

1. Stop the air conditioner operation.

2. Press the SET TEMPERATURE buttons , simultaneously for 3 seconds
or more to start the self-diagnosis.

Error code

Error history number

SU MOTU WE TH FR SA

3. Press the SET TEMPERATURE button to select the error history number.

Lower

0 1 2 3 4 5 6 7

Raise





F E d c b A 9 8

4. Press the SET TEMPERATURE buttons , simultaneously for 3 seconds or more
or there is no key input for 60 seconds to stop the display.

02-02

2-2 TROUBLE SHOOTING WITH ERROR CODE

AMP Air Conditioning

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Trouble shooting 1

Indicate or Display:

OUTDOOR UNIT Error Method:
Serial Communication Error

Refer to error code table.

(Serial Reverse Transfer Error)
Detective Actuators: Detective details:

Outdoor unit Main PCB
Outdoor unit Fan motor

When the indoor unit cannot receive the serial signal from Outdoor unit
more than 2minutes after power ON, or the indoor unit cannot receive
the serial signal more than 15seconds during normal operation.

Forecast of Cause:

1. Connection failure 2. External cause 3. Main PCB failure 4. Inverter PCB (IPM) failure

5. Filter PCB failure 6. Outdoor unit Fan motor failure

Check Point 1-1 : Reset the power and operate

Does error indication reappear?

NO

YESYES

Check Point 2 : Check connection

Check Point 1-2 : Check external cause such as noise

Check any loose or removed connection line of
between indoor unit and outdoor unit.

>> If there is an abnormal condition, correct it by
referring to Installation Manual or Data &
Technical Manual.

Check connection condition in control unit.
(If there is loose connector, open cable or mis-wiring)

Check if the ground connection is proper.
Check if there is any equipment that causes harmonic wave
near the power cable (Neon light bulb or any electronic
equipment which causes harmonic wave).

OK

Check Point 3 : Check the voltage of power supply

Check the voltage of power supply

>> Check if AC198V(AC220V-10%) - 264V(AC240V+10%) appears
at outdoor unit terminal L - N.

OK

Check Point 4 : Check serial signal (Reverse transfer signal)

Check serial signal (Reverse transfer signal)

>> Check if indicated value swings between AC90V and AC270V at outdoor unit terminal 1 - 3.
>> If it is abnormal, Check the parts as follows.

- Outdoor unit fan motor (PARTS INFORMATION 5)

- Inverter PCB (IPM) (PARTS INFORMATION 6)
>> If Outdoor fan motor is abnormal, replace Outdoor unit fan motor and Main PCB.
>> If IPM is abnormal, replace it.
>> If the parts are normal, replace Main PCB.

BLACK
WHITE
RED
BLACK
WHITE

1
2

3
L
N

+

-

02-03

Trouble shooting 2

AMP Air Conditioning

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Indicate or Display:

INDOOR UNIT Error Method:
Serial Communication Error

Refer to error code table.

(Serial Forward Transfer Error)
Detective Actuators: Detective details:

Indoor unit Controller PCB

When the outdoor unit cannot properly receive the serial signal from
indoor unit for 10 seconds or more.

Forecast of Cause:

1. Connection failure 2. External cause 3. Controller PCB failure

Check Point 1-1 : Reset the power and operate

Does error indication reappear?

NO

YESYES

Check Point 2 : Check connection

Check any loose or removed connection line of
between indoor unit and outdoor unit.

>> If there is an abnormal condition, correct it by
referring to Installation Manual or Data &
Technical Manual.

Check connection condition in control unit.
(If there is loose connector, open cable or mis-wiring)

Check Point 1-2 : Check external cause such as noise

Check if the ground connection is proper.
Check if there is any equipment that causes harmonic wave
near the power cable (Neon light bulb or any electronic
equipment which causes harmonic wave).

OK

Check Point 3 : Check the voltage of power supply

Check the voltage of power supply

>> Check if AC198V(AC220V-10%) - 268V(AC240V+10%) appears
at outdoor unit terminal L - N.

OK

Check Point 4 : Check serial signal (Forward transfer signal)

Check serial signal (Forward transfer signal)

>> Check if indicated value swings between AC30V and AC130V at outdoor unit terminal 2 - 3.
>> If it is abnormal, replace Controller PCB.

BLACK
WHITE
RED
BLACK
WHITE

1
2

3
L

N

+

-

02-04

Trouble shooting 3

AMP Air Conditioning

www.ampair.co.uk | [e-mail]

Indicate or Display:

INDOOR UNIT Error Method:
Wired Remote Controller

Refer to error code table.

Communication Error

Detective Actuators: Detective details:

Indoor unit Controller PCB
Wired Remote Controller (Option)

When the indoor unit cannot properly receive the signal from
Wired Remote Controller for 1 minute or more.

Forecast of Cause:

1. Connection failure 2. Wired Remote Controller failure 3. Controller PCB failure

Check Point 1 : Check the connection of terminal

Check & correct the followings.
Check the connection of terminal between Wired Remote Controller and indoor unit,
and check if there is a disconnection of the cable.

OKOK

Check Point 2 : Check Wired Remote Controller and Controller PCB

Check Voltage at CN140 of Controller PCB. (terminal 1-3)
(Power supply to Remote Control)

>> If it is DC12V, Remote Control is failure. (Controller PCB is normal) >> Replace Remote Control
>> If it is DC 0V, Controller PCB is failure. (Check Remote Control once again) >> Replace Controller PCB

02-05

Trouble shooting 4

AMP Air Conditioning

www.ampair.co.uk | [e-mail]

Indicate or Display:

INDOOR UNIT Error Method:

Refer to error code table.

Fan Motor Drive Circuit Error

Detective Actuators: Detective details:

Indoor Unit Power Supply PCB

When a momentary power cut off.
When do not start fan motor.

Forecast of Cause :

1. External cause 2. Connection of connector failure 3. Power Supply PCB failure

Check Point 1 : Check external cause at Indoor and Outdoor (Voltage drop or Noise)

Instant drop : Check if there is a large load electric apparatus in the same circuit.

Momentary power failure : Check if there is a defective contact or leak current
in the power supply circuit.

Noise : Check if there is any equipment causing harmonic wave near electric line.
(Neon bulb or electric equipment that may cause harmonic wave)
Check the complete insulation of grounding.

OKOK

Check Point 2 : Check connection of Connector

Check if connector is removed.
Check erroneous connection.
Check if cable is open.

>>Upon correcting the removed connector or mis-wiring, reset the power.

OKOK

Check Point 3 : Replace Power supply PCB

If Check Point 1, 2 do not improve the symptom, replace Power supply PCB.

02-06

Trouble shooting 5

AMP Air Conditioning

www.ampair.co.uk | [e-mail]

INDOOR UNIT Error Method:

Indoor Room Thermistor Error

Indicate or Display:

Refer to error code table.

Detective Actuators:

Indoor Unit Controller PCB Circuit
Indoor Temperature Thermistor

Forecast of Cause :

1. Connector failure connection 2. Thermistor failure 3. Controller PCB failure

Detective details:

Indoor unit thermistor is open or short is detected always.

Check Point 1 : Check connection of Connector

Check if connector is loose or removed
Check erroneous connection
Check if thermistor cable is open

>>Reset Power when reinstalling due to removed connector or incorrect wiring.

OK

Check Point 2 : Remove connector and check Thermistor resistance value

Thermistor Characteristics (Rough value)

Temperature (°C )
Resistance value (k )

Temperature (°C )

-10 -5 0 5 10 15 20 25

58.2 44.0 33.6 25.9 20.2 15.8 12.5 10.0

30 35 40 45

Resistance value (k )

If Thermistor is either open or shorted, replace it and reset the power.

8.0 6.5 5.3 4.3

OK

Check Point 3 : Check voltage of Controller PCB (DC5.0V)

Make sure circuit diagram of each indoor unit and check terminal voltage at Thermistor (DC5.0V)

BLACK

1

CN110

CN114

If the voltage does not appear, replace Controller PCB and execute the check operation again.

1

BLACK

2

2

BLACK

1

1

BLACK

2

2

H/E Thermistor

Room Temp. Thermistor

02-07

Trouble shooting 6

AMP Air Conditioning

www.ampair.co.uk | [e-mail]

INDOOR UNIT Error Method:

Indoor Heat Ex. Thermistor Error

Indicate or Display:

Refer to error code table.

Detective Actuators:

Indoor Unit Controller PCB

Detective details:

Indoor unit thermistor is open or short is detected always.

Heat Exchanger (MID) Thermistor

Forecast of Cause :

1. Connector failure connection 2. Thermistor failure 3. Controller PCB failure

Check Point 1 : Check connection of Connector

Check if connector is loose or removed
Check erroneous connection
Check if thermistor cable is open

>>Reset Power when reinstalling due to removed connector or incorrect wiring.

Check Point 2 : Remove connector and check Thermistor resistance value

Thermistor Characteristics (Rough value)

Temperature (°C )
Resistance value (k )

Temperature (°C )

-30 -25 -20 -15 -10 -5 0 5 10 15

1131.9 804.5 579.6 422.9 312.3 233.2 176.0 134.2 103.3 80.3

20 25 30 35 40 45 50 55 60 63

Resistance value (k )

If Thermistor is either open or shorted, replace it and reset the power.

62.9 49.7 39.6 31.7 25.6 20.8 17.1 14.1 11.6 10.4

OK

Check Point 3 : Check voltage of Controller PCB (DC5.0V)

Make sure circuit diagram of each indoor unit and check terminal voltage at Thermistor (DC5.0V)

BLACK

1

CN110

CN114

If the voltage does not appear, replace Controller PCB and execute the check operation again.

1

BLACK

2

2

BLACK

1

1

BLACK

2

2

H/E Thermistor

Room Temp. Thermistor

02-08

Trouble shooting 7

AMP Air Conditioning

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INDOOR UNIT Error Method:

Indoor Unit Fan Motor1 Error

Indicate or Display:

Refer to error code table.

Detective Actuators:

Indoor unit Power Supply PCB
Indoor unit fan motor

Detective details:

When the condition that actual frequency of Indoor Fan is
below 1/3 of target frequency is continued more than 56 seconds.

Forecast of Cause:

1. Fan rotation failure 2. Fan motor winding open 3. Motor protection by surrounding temperature rise

4. Power Supply PCB failure 5. Indoor unit fan motor failure

Check Point 1 : Check rotation of Fan

Rotate the fan by hand when operation is off.
(Check if fan is caught, dropped off or locked motor)

>>If Fan or Bearing is abnormal, replace it.

OK

Check Point 2 : Check ambient temp. around motor

Check excessively high temperature around the motor.
(If there is any surrounding equipment that causes heat)

>>Upon the temperature coming down, restart operation.

OK

Check Point 3 : Check Indoor unit fan motor

Check Indoor unit fan motor. (PARTS INFORMATION 4)

>>If Indoor unit fan motor is abnormal, replace Indoor unit fan motor.

OK

Check Point 4 : Replace Power Supply PCB

If Check Point 1- 3 do not improve the symptom, replace Power Supply PCB.

02-09

Trouble shooting 8

AMP Air Conditioning

www.ampair.co.uk | [e-mail]

INDOOR UNIT Error Method:
Drainage Error

Indicate or Display:

Refer to error code table.

Detective Actuators:

Indoor Unit Controller PCB Circuit
Float Switch

Forecast of Cause : 1. Float switch failure 2. Shorted connector/wire 3. Controller PCB failure

4. Drain pump failure 5. Hose clogging

Detective details:

When Float switch is ON for more than 3 minutes.

Check Point 1 : Check Float Switch

Check operation of float switch. (any blocking by dust, etc.)
Remove Float switch and check ON/OFF switching operation

by using a meter.

>>If Float switch is abnormal, replace it.

ON OFF

OK

Check Point 2 : Check Connector and Wire

Check loose contact of CN120 and shorted wire (pinched wire).

>>Replace Float switch if the wire is abnormal

OK

Check Point 3 : Check Drain Hose

Check Drain Hose .

>>If there is Hose clogging. Please clear the clog.

OK

Check Point 4 : Check Controller PCB

If Check Point 1 ~ 3 do not improve the symptom, change

Controller PCB and execute the check operation again.

02-10

Trouble shooting 9

AMP Air Conditioning

www.ampair.co.uk | [e-mail]

INDOOR UNIT Error Method:

Indoor Unit Fan Motor2 Error

Indicate or Display:

Refer to error code table.

Detective Actuators:

Indoor unit Power Supply PCB
Indoor unit fan motor

Detective details:

When the condition that actual frequency of Indoor Fan is
below 1/3 of target frequency is continued more than 56 seconds.

Forecast of Cause:

1. Fan rotation failure 2. Fan motor winding open 3. Motor protection by surrounding temperature rise

4. Power Supply PCB failure 5. Indoor unit fan motor failure

Check Point 1 : Check rotation of Fan

Rotate the fan by hand when operation is off.
(Check if fan is caught, dropped off or locked motor)

>>If Fan or Bearing is abnormal, replace it.

OK

Check Point 2 : Check ambient temp. around motor

Check excessively high temperature around the motor.
(If there is any surrounding equipment that causes heat)

>>Upon the temperature coming down, restart operation.

OK

Check Point 3 : Check Indoor unit fan motor

Check Indoor unit fan motor. (PARTS INFORMATION 4)

>>If Indoor unit fan motor is abnormal, replace Indoor unit fan motor.

OK

Check Point 4 : Replace Power Supply PCB

If Check Point 1- 3 do not improve the symptom, replace Power Supply PCB.

02-11

Trouble shooting 10

AMP Air Conditioning

www.ampair.co.uk | [e-mail]

OUTDOOR UNIT Error Method:
Inverter Error

Indicate or Display:

Refer to error code table.

Detective Actuators:

Inverter PCB

Forecast of Cause :

1. External cause. 2. Power supply to Filter PCB to Inverter PCB wiring disconnection, open

3. Filter PCB failure 4. Inverter PCB failure

Check Point 1-1 :
Turn the power on again.

Error displayed again?

NO

Detective details:

Error information received from Inverter PCB

Check Point 1-2 : External cause

Check if temporary voltage drop was not generated.
Check if temporary open was not generated.
Check if ground is connected correctly or there are no related cables near the

power line.

YES

Check Point 2 : Check the wiring (Power supply to Filter PCB to Inverter PCB)

Connector and wiring connection state check
Cable open check

OK

Check Point 3 : Replace Filter PCB (INV) and Inverter PCB

Replace Filter PCB and Inverter PCB.

02-12

Trouble shooting 11

AMP Air Conditioning

www.ampair.co.uk | [e-mail]

OUTDOOR UNIT Error Method:
IPM Error

Indicate or Display:

Refer to error code table.

Detective Actuators:

Outdoor unit Main PCB
Compressor

Detective details:

When more than normal operating current to IPM in Main PCB flows,
the compressor stops.
After the compressor restarts, if the same operation is repeated within 40sec,
the compressor stops again.
If and repeats 5 times, the compressor stops permanently.

Forecast of Cause :

1. Defective connection of electric components 2. Outdoor Fan Operation failure

3. Outdoor Heat Exchanger clogged 4. Compressor failure 5. Main PCB failure

Check Point 1 : Check connections of Outdoor Unit Electrical Components

Check if the terminal connection is loose.
Check if connector is removed.

Check erroneous connection.
Check if cable is open.

>>Upon correcting the removed connector or mis-wiring, reset the power.

OK

Check Point 2 : Check Outdoor Fan, Heat Exchanger

Is there anything obstructing the air distribution circuit?
Is there any clogging of Outdoor Heat Exchanger?

Is the Fan rotating by hand when operation is off ?

>> If the Fan Motor is locked, replace it.

OK

Check Point 3 : Check Outdoor Fan

Check Outdoor Fan Motor. (Refer to Trouble shooting 21,22)

>> If the Fan Motor is failure, replace it.

OKOK

Check Point 4 : Check Compressor

Check Compressor.

(PARTS INFORMATION 2)

OKOK

Check Point 5 : Replace Main PCB

If Check Point 1 ~ 4 do not improve the symptom, change Main PCB.

02-13

Trouble shooting 12

AMP Air Conditioning

www.ampair.co.uk | [e-mail]

OUTDOOR UNIT Error Method:

Discharge Thermistor Error

Indicate or Display:

Refer to error code table.

Detective Actuators:

Discharge temperature thermistor

Forecast of Cause :

1. Connector connection failure, open

2. Thermistor failure

3. Main PCB failure

Detective details:

Discharge temperature thermistor short detected
Discharge thermistor open detected

Check Point 1 : Check the connector connection and cable open

Connector connection state check
Cable open check

OK

Check Point 2 : Check the thermistor

Thermistor characteristics check (Disconnect the thermistor from the PCB and check.)
* For the thermistor characteristics, refer to the "Service Parts Information 7".

OK

Check Point 3 : Check voltage of Main PCB (DC5.0V)

Main PCB (CN24:1-3) voltage value = 5V
Remove the thermistor from Main PCB, check the voltage.

THERMISTOR

(DIS.TEMP.)

BROWN

BROWN

1 2 3
1 2 3

CN24

Discharge temperature thermistor (CN24:1-3)

If the voltage does not appear, replace Main PCB,

and execute the check operation again.

02-14

Trouble shooting 13

AMP Air Conditioning

www.ampair.co.uk | [e-mail]

OUTDOOR UNIT Error Method:
Compressor Thermistor Error

Indicate or Display:

Refer to error code table.

Detective Actuators:

Compressor temperature thermistor

Forecast of Cause :

1. Connector connection failure, open

2. Thermistor failure

3. Main PCB failure

Detective details:

Compressor temperature thermistor short detected
Compressor thermistor open detected

Check Point 1 : Check the connector connection and cable open

Connector connection state check
Cable open check

OK

Check Point 2 : Check the thermistor

Thermistor characteristics check (Disconnect the thermistor from the PCB and check.)
* For the thermistor characteristics, refer to the "Service Parts Information 7".

OK

Check Point 3 : Check voltage of Main PCB (DC5.0V)

Main PCB (CN27:1-3) voltage value = 5V
Remove the thermistor from Main PCB, check the voltage.

(COMP SHELL)

THERMISTOR

BROWN

BROWN

1 2 3
1 2 3

CN27

Compressor temperature thermistor (CN27:1-3)

If the voltage does not appear, replace Main PCB, and execute

the check operation again.

02-15

Trouble shooting 14

AMP Air Conditioning

www.ampair.co.uk | [e-mail]

OUTDOOR UNIT Error Method:

Heat Ex. Liquid Temp.
Thermistor Error

Indicate or Display:

Refer to error code table.

Detective Actuators:

Heat exchanger outlet temp. thermistor

Detective details:

Heat exchanger liquid temperature thermistor short or open detected

Heat exchanger middle temp. thermistor

Forecast of Cause :

1. Connector connection defective, open

2. Thermistor failure

3. Main PCB failure

Check Point 1 : Check the connector connection and cable open

Connector connection state check
Cable open check

OK

Check Point 2 : Check the thermistor

Thermistor characteristics check (Disconnect the thermistor from the PCB and check.)
* For the thermistor characteristics, refer to the "Service Parts Information 7".

OK

Check Point 3 : Check voltage of Main PCB (DC5.0V)

Main PCB (CN25:1-3, CN22:1-2) voltage value = 5V
Remove the thermistor from Main PCB, check the voltage.

THERMISTOR

(HEX. PIPE. MID.)

BLACK

BLACK

1 2
1 2

CN22

THERMISTOR

(HEX. PIPE. OUT.)

BLACK

BLACK

1 2 3
1 2 3

CN25

Heat exchanger outlet/ middle temperature thermistor (CN25:1-3/ CN22:1-2)

If the voltage does not appear, replace Main PCB, and execute

If the voltage does not appear,

the check operation again.

02-16

Trouble shooting 15

AMP Air Conditioning

www.ampair.co.uk | [e-mail]

OUTDOOR UNIT Error Method:

Outdoor Thermistor Error

Indicate or Display:

Refer to error code table.

Detective Actuators:

Outdoor temperature thermistor

Forecast of Cause :

1. Connector connection defective, open

2. Thermistor failure

3. Main PCB failure

Detective details:

Outdoor temperature thermistor short or open detected

Check Point 1 : Check the connector connection and cable open

Connector connection state check
Cable open check

OK

Check Point 2: Check the thermistor

Thermistor characteristics check (Disconnect the thermistor from the PCB and check.)
* For the thermistor characteristics, refer to the "Service Parts Information 7".

OK

Check Point 3 : Check voltage of Main PCB (DC5.0V)

Main PCB (CN26:1-3) voltage value = 5V
Remove the thermistor from Main PCB, check the voltage.

(OUT TEMP.)

THERMISTOR

BLUE

BLUE

1 2 3
1 2 3

CN26

Outdoor temperature thermistor (CN26:1-3)

If the voltage does not appear, replace Main PCB, and execute

If the voltage does not appear, replace Main PCB

the check operation again.

02-17

Trouble shooting 16

AMP Air Conditioning

www.ampair.co.uk | [e-mail]

OUTDOOR UNIT Error Method:

Heat Sink Thermistor Error

Indicate or Display:

Refer to error code table.

Detective Actuators:

Heat Sink temperature thermistor (INV)

Detective details:

Heat sink temperature thermistor short or open detected

Heat Sink temperature thermistor (PFC)

Forecast of Cause :

1. Connector connection defective, open 2. Thermistor failure

3. Main PCB failure 4. Inverter PCB failure

Check Point 1 : Check the connector connection and cable open

Connector connection state check
Cable open check

OK

Check Point 2: Check the thermistor

Thermistor characteristics check (Disconnect the thermistor from the PCB and check.)
* For the thermistor characteristics, refer to the "Service Parts Information 8".

OK

Check Point 3 : Check voltage of Main PCB (DC5.0V)

Main PCB (CN23:1-2) voltage value = 5V
Remove the thermistor from Main PCB, check the voltage.

Inverter PCB (CN803:1-2) voltage value = 5V
Remove the thermistor from Inverter PCB, check the voltage.

(HEATSINK PFC)

THERMISTOR

BLACK

BLACK

1 2
1 2

CN23

Heat sink temp. thermistor
(CN23:1-2)

If the voltage does not appear, replace Main PCB, and execute

If the voltage does not appear, replace Main PCB

Heat sink temp. thermistor
(CN803:1-2)

(HEATSINK INV)

THERMISTOR

BLACK

BLACK

1 2
1 2

CN803

the check operation again.

02-18

Trouble shooting 17

AMP Air Conditioning

www.ampair.co.uk | [e-mail]

OUTDOOR UNIT Error Method:
Current Sensor Error

Indicate or Display:

Refer to error code table.

Detective Actuators:

Outdoor unit Main PCB

Detective details:

When Input Current Sensor has detected 0A, while Inverter Compressor is
operating at higher than 56rps, after 1minute upon starting the Compressor.
(Except during the defrost operation)

Forecast of Cause :

1. Defective connection of electric components 2. External cause 3. Main PCB failure

Check Point 1-1 : Reset Power Supply and operate

Does Error indication show again?

NO

YES

Check Point 2 :
Check connections of Outdoor Unit Electrical Components

Check if the terminal connection is loose.
Check if connector is removed.

Check erroneous connection.
Check if cable is open.

>>Upon correcting the removed connector or mis-wiring,
reset the power.

OK

Check Point 1-2 :
Check external cause at Indoor and Outdoor
(Voltage drop or Noise)

Instant drop : Check if there is a large load electric
apparatus in the same circuit.

Momentary power failure : Check if there is a defective
contact or leak current in the
power supply circuit.

Noise : Check if there is any equipment causing harmonic
wave near electric line.(Neon bulb or electric
equipment that may cause harmonic wave)
Check the complete insulation of grounding.

Check Point 4 : Replace Main PCB

If Check Point 1, 2 do not improve the symptom, change Main PCB.

02-19

Trouble shooting 18

AMP Air Conditioning

www.ampair.co.uk | [e-mail]

Indicate or Display:

OUTDOOR UNIT Error Method:

Pressure sensor error

Refer to error code table.

Detective Actuators: Detective details:

Outdoor unit Main PCB
Pressure sensor

30 seconds or more after power-on, when pressure sensor detection
value detects the condition below continuously for 30 seconds or more.

>

Ps - 0.26 or Ps 5.63 [MPa]

=

>

=

Forecast of Cause :

1. Connector connection failure 2. Pressure sensor failure 3. Main PCB failure

Check Point 1 : Check connection of the Pressure sensor

Check if the terminal connection is loose.
Check if connector is removed.
Check if connector is erroneous connection.
Check if cable is open.

>> Upon correcting the removed connector or mis-wiring, reset the power.

OK

Check Point 2 : Check output voltage of Main PCB

Check voltage of Main PCB.
(Measure at Main PCB side connector)

>>1 pin(Red) - 3 pin(Black) DC5V 5%

RED

1

1

CN16

WHITE

2

2

BLACK

3

3

PRESSURE SENSOR

PS

If the voltage is not correct, replace Main PCB.

OK

Check Point 3 : Check output voltage of Pressure Sensor

Check voltage of Main PCB.
(Measure at Main PCB side connector)
>>2 pin(White) - 3 pIn(Black) Voltage is refer to the following graph.

4.5

Voltage [V]

2.5

0.5
0 2.5 5

Pressure [MPa]

If the voltage is not correct, replace Presure Sensor.

02-20

Trouble shooting 19

AMP Air Conditioning

www.ampair.co.uk | [e-mail]

INDOOR UNIT Error Method:

Over Current Error

Indicate or Display:

Refer to error code table.

Detective Actuators:

Outdoor unit Main PCB
Compressor
Inverter PCB

Forecast of Cause :

1. Outdoor unit fan operation defective, foreign matter on heat exchanger,

Detective details:

"Protection stop by overcurrent generation after inverter compressor start
processing completed'' generated consecutively 10 times.
* The number of generations is reset if the start-up of
the compressor succeeds.

excessive rise of ambient temperature

2. Main PCB

3. Inverter compressor failure (lock, winding short)

4. Inverter PCB (IPM) failure

Check Point 1 : Check the outdoor unit fan operation, heat exchanger, ambient temperature

No obstructions in air passages?
Heat exchange fins clogged
Outdoor unit fan motor check
Ambient temperature not raised by the effect of other heat sources?
Discharged air not sucked in?

OKOK

Check Point 2: Check Transistor PCB (IPM)

Check IPM. (PARTS INFORMATION 6)

>> If IPM is abnormal, replace Inverter PCB.

OKOK

Check Point 3: Replace Main PCB

If Check Point 1 or 1,2 do not improve the symptom, change Main PCB.

OKOK

Check Point 4: Replace Compressor

If Check Point 3 do not improve the symptom, change Compressor.

02-21

Trouble shooting 20

AMP Air Conditioning

www.ampair.co.uk | [e-mail]

OUTDOOR UNIT Error Method:
Compressor Control Error

Indicate or Display:

Refer to error code table.

Detective Actuators:

Outdoor unit Main PCB
Compressor
Inverter PCB

Detective details:

While running the compressor, if the detected rotor location is out of
phase with actual rotor location more than 90°,
the compressor stops.
After the compressor restarts, if the same operation is repeated
within 40sec, the compressor stops again.
If and repeats 5 times, the compressor stops permanently.

Forecast of Cause :

1. Defective connection of electric components 2. Main PCB failure 3. Compressor failure

4. Inverter PCB (IPM) failure

Check Point 1 : Check Noise from Compressor

Turn on Power and check operation noise.

If an abnormal noise show, replace Compressor.

OKOK

Check Point 2 : Check connection of around the Compressor components

For Compressor Terminal, Main PCB

Check if connector is removed.

Check erroneous connection.
Check if cable is open.

(Refer to PARTS INFORMATION 2)

>>Upon correcting the removed connector or mis-wiring, reset the power.

OKOK

Check Point 3: Check Inverter PCB (IPM)

Check IPM. (PARTS INFORMATION 6)

>> If IPM is abnormal, replace Inverter PCB.

OKOK

Check Point 4: Replace Main PCB

If Check Point 1,2 or 1 3 do not improve the symptom, change Main PCB.

OKOK

Check Point 5: Replace Compressor

If Check Point 4 do not improve the symptom, change Compressor.

02-22

Trouble shooting 21

AMP Air Conditioning

www.ampair.co.uk | [e-mail]

OUTDOOR UNIT Error Method:

Outdoor Unit Fan Motor 1 Error

Indicate or Display:

Refer to error code table.

Detective Actuators:

Outdoor unit Main PCB
Outdoor unit fan motor

Detective details:

When outdoor fan rotation speed is less than 100rpm in 20 seconds
after fan motor starts, fan motor stops.
After fan motor restarts, if the same operation within 60sec is repeated
3 times in a row, compressor and fan motor stops.
If and repeats 5 times in a row
permanently

Forecast of Cause:

1. Fan rotation failure 2. Motor protection by surrounding temperature rise 3. Main PCB failure

4. Outdoor unit fan motor failure

Check Point 1 : Check rotation of Fan

Rotate the fan by hand when operation is off.
(Check if fan is caught, dropped off or locked motor)

>>If Fan or Bearing is abnormal, replace it.

OK

Check Point 2 : Check ambient temp. around motor

Check excessively high temperature around the motor.
(If there is any surrounding equipment that causes heat)

>>Upon the temperature coming down, restart operation.

, compressor and fan motor stops

.

OK

Check Point 3 : Check Outdoor unit fan motor

Check Outdoor unit fan motor. (PARTS INFORMATION 5)

>>If Outdoor Fan Motor is abnormal, replace Outdoor fan motor and Main PCB.

OK

Check Point 4 : Check Output Voltage of Main PCB

Check outdoor unit circuit diagram and the voltage. (Measure at Main PCB side connector)

RED

1

1

2

2

BLACK

3
4
5
6

3

WHITE

4

YELLOW

5

BROWN

6

CN81

If the voltage is not correct, replace Main PCB.

FAN MOTOR
(UPPER)

FM

Read wire DC voltage
Red - Black

White - Black

280V (AC220V-10%)
~ 373V (AC240V+10%)

15 1.5V

02-23

Trouble shooting 22

AMP Air Conditioning

www.ampair.co.uk | [e-mail]

OUTDOOR UNIT Error Method:

Outdoor Unit Fan Motor 2 Error

Indicate or Display:

Refer to error code table.

Detective Actuators:

Outdoor unit Main PCB
Outdoor unit fan motor

Detective details:

When outdoor fan rotation speed is less than 100rpm in 20 seconds
after fan motor starts, fan motor stops.
After fan motor restarts, if the same operation within 60sec is repeated
3 times in a row, compressor and fan motor stops.
If and repeats 5 times in a row
permanently

Forecast of Cause:

1. Fan rotation failure 2. Motor protection by surrounding temperature rise 3. Main PCB failure

4. Outdoor unit fan motor failure

Check Point 1 : Check rotation of Fan

Rotate the fan by hand when operation is off.
(Check if fan is caught, dropped off or locked motor)

>>If Fan or Bearing is abnormal, replace it.

OK

Check Point 2 : Check ambient temp. around motor

Check excessively high temperature around the motor.
(If there is any surrounding equipment that causes heat)

>>Upon the temperature coming down, restart operation.

, compressor and fan motor stops

.

OK

Check Point 3 : Check Outdoor unit fan motor

Check Outdoor unit fan motor. (PARTS INFORMATION 5)

>>If Outdoor Fan Motor is abnormal, replace Outdoor fan motor and Main PCB.

OK

Check Point 4 : Check Output Voltage of Main PCB

Check outdoor unit circuit diagram and the voltage. (Measure at Main PCB side connector)

RED

1

1

2

2

BLACK

3
4
5
6

3

WHITE

4

YELLOW

5

BROWN

6

CN82

If the voltage is not correct, replace Main PCB.

FAN MOTOR
(LOWER)

FM

Read wire DC voltage
Red - Black

White - Black

280V (AC220V-10%)
~ 373V (AC240V+10%)

15 1.5V

02-24

Trouble shooting 23

AMP Air Conditioning

www.ampair.co.uk | [e-mail]

OUTDOOR UNIT Error Method:
4-Way Valve Error

Indicate or Display:

Refer to error code table.

Detective Actuators:

Indoor Unit Controller PCB Circuit
Heat Exchanger Temperature Thermistor
Room Temperature Thermistor
4-way valve

Detective details:

When the indoor heat exchanger temperature is compared with
the room temperature, and either following condition is detected
continuously two times, the compressor stops.
Cooling or Dry operation
[Indoor heat exchanger temp.] - [Room temp.] > 20degC
Heating operation
[indoor heat exchanger temp.] - [Room temp.] < -14degC
If the same operation is repeated 5 times,
the compressor stops permanently.

Forecast of Cause :

1. Connector connection failure 2. Thermistor failure 3. Coil failure 4. 4-way valve failure

5. Main PCB failure

Check Point 1 : Check connection of Connector

Check if connector is removed.
Check erroneous connection.
Check if thermistor cable is open.

>> Upon correcting the removed connector or mis-wiring, reset the power.

OKOK

Check Point 2 : Check thermistor of Indoor unit

Isn’t it fallen off the holder?
Is there a cable pinched?

>> Check characteristics of thermistor, (Refer to Trouble shooting 5,6),
If defective, replace the thermistor.

OKOK

Check Point 3 : Check the solenoid coil and 4-way valve

[ Solenoid coil ]
Remove CN111 from PCB and check the resistance value of coil.
Resistance value is about 1.4k

>> If it is Open or abnormal resistance value, replace Solenoid Coil.

[ 4-way valve ]
Check each piping temperature,
and the location of the valve by the temperature difference.
>> If the value location is not proper, replace 4-way valve.

OKOK

Check Point 4 : Replace Main PCB

If Check Point 1- 3 do not improve the symptom, replace Main PCB.

02-25

Trouble shooting 24

AMP Air Conditioning

www.ampair.co.uk | [e-mail]

OUTDOOR UNIT Error Method:

Discharge Temp. Error

Indicate or Display:

Refer to error code table.

Detective Actuators:

Detective details:

Discharge temperature thermistor

Forecast of Cause :

1. 3-way valve not opened

2. EEV defective, strainer clogged

3. Outdoor unit operation failure, foreign matter on heat exchanger

4. Discharge temperature thermistor failure

5. Insufficient refrigerant

<Cooling operation>

Check Point 1 : Check if 3-way valve(gas side) is open.

If the 3-way valve(gas side) was closed, open the
3-way valve(gas side) and check operation.

OK

Check Point 2 : Check the EEV, strainer

EEV open?
Strainer clogging check (before and after EEV, ACM

oil return)
Refer to "Service Parts Information 3, 4 "

"Protection stop by "discharge temperature 115°C during compressor
operation'''' generated 2 times within 24 hours.

<Heating operation>

Check Point 1 : Check if 3-way valve(liquid side) is open.

If the 3-way valve(liquid side) was closed, open the
3-way valve(liquid side) and check operation.

OK

Check Point 2 : Check the EEV, strainer

EEV open?
Strainer clogging check (before and after EEV, ACM

oil return)
Refer to "Service Parts Information 3, 4"

OK

Check Point 3 : Check the outdoor unit fan,heat exchanger

Check for foreign object at heat exchanger
Check if fan can be rotated by hand.
Motor check(PARTS INFORMATION 5)

OK

Check Point 4 : Check the discharge thermistor

Discharger thermistor characteristics check
(Check by disconnecting thermistor from PCB.)

* For the characteristics of the thermistor,
refer to the "Service Parts Information 7".

OK

Check Point 5 : Check the refrigerant amount

Leak check

OK

02-26

Trouble shooting 25

AMP Air Conditioning

www.ampair.co.uk | [e-mail]

OUTDOOR UNIT Error Method:
Compressor Temp. Error

Indicate or Display:

Refer to error code table.

Detective Actuators:

Detective details:

Compressor temperature thermistor

Forecast of Cause :

1. 3-way valve not opened

2. EEV defective, strainer clogged

3. Outdoor unit operation failure, foreign matter on heat exchanger

4. Compressor temperature thermistor failure

5. Insufficient refrigerant

<Cooling operation>

Check Point 1 : Check if 3-way valve(gas side) is open.

If the 3-way valve(gas side) was closed, open the
3-way valve(gas side) and check operation.

OK

Check Point 2 : Check the EEV, strainer

"Protection stop by "compressor temperature" 110°C during compressor
operation""generated 2 times within 24 hours

<Heating operation>

Check Point 1 : Check if 3-way valve(liquid side) is open.

If the 3-way valve(liquid side) was closed, open the
3-way valve(liquid side) and check operation.

OK

Check Point 2 : Check the EEV, strainer

EEV open?
Strainer clogging check (before and after EEV, ACM)

Refer to "Service Parts Information 3, 4".

OK

Check Point 3 : Outdoor unit fan, heat exchanger check

Check for foreign object at heat exchanger
Check if fan can be rotated by hand.
Motor check(PARTS INFORMATION 5)

OK

Check Point 4 : Check the compressor temp. thermistor

Compressor temperature thermistor characteristics check
(Check by disconnecting thermistor from PCB)

* For the characteristics of the thermistor,
refer to the "Service Parts Information 7.

OK

Check Point 5 : Check the refrigerant amount

EEV open?
Strainer clogging check (before and after EEV, ACM)

Refer to "Service Parts Information 3,4 ".

OK

Leak check

02-27

Trouble shooting 26

AMP Air Conditioning

www.ampair.co.uk | [e-mail]

OUTDOOR UNIT Error Method:

Low Pressure Error

Indicate or Display:

Refer to error code table.

Detective Actuators:

Detective details:

Suction pressure sensor

Forecast of Cause :

1. 3-way valve not opened 2. Outdoor unit ambient temperature too low

3. Outdoor unit fan operation defective, foreign matter at heat exchanger

4. EEV defective, strainer clogged 5. Solenoid valve defective

6. Low pressure sensor characteristics defective 7. Insufficient refrigerant

<Cooling operation>

Check Point 1 : Check if 3-way valve(gas side) is open.

If the 3-way valve(gas side) was closed, open the
3-way valve(gas side) and check operation.

OK

Check Point 2 : Check the EEV, strainer clogging

Indoor unit EEV operation check
Strainer not clogged?

"Protection stop by suction pressure 0.02MPaG continued for 5 minutes"
repeats 5 times within 2 hours.

<Heating operation>

Check Point 1 : Check if 3-way valve(liquid side) is open.

If the 3-way valve(liquid side) was closed, open the
3-way valve(liquid side) and check operation.

OK

Check Point 2 : Check the outdoor unit ambient temperature

Outdoor ambient temperature lower than operating range?

OK

Check Point 5 : Check the solenoid valve (SV1)

Solenoid valve operation check

OK

Check Point 6 : Check the suction pressure sensor

Suction pressure sensor characteristics check

* For the characteristics of the suction pressure sensor
(PARTS INFORMATION 8)

OK

OK

Check Point 3 :
Check the outdoor unit fan operation, heat exchanger

No foreign object in air passage?
Heat exchange fins clogged
Fan rotates?
Outdoor unit fan motor check

OK

Check Point 4 : Check the outdoor unit EEV, strainer clogging

Outdoor unit EEV operation check
Strainer not clogged?

Refer to "Service Parts Information 3"

Check Point 7 : Check the refrigerant amount

Leak check

02-28

2-3 TROUBLE SHOOTING WITH NO ERROR CODE

AMP Air Conditioning

www.ampair.co.uk | [e-mail]

Trouble shooting 27

Forecast of Cause:

1. Power Supply failure 2. External cause

Indoor Unit - No Power

3. Electrical Components defective

Check Point 1 : Check Installation Condition

Isn’t the breaker down?
Check loose or removed connection cable.

>>If abnormal condition is found, correct it by referring
to Installation Manual or Data & Technical Manual.

OKOK

Check Point 2 : Check external cause at Indoor and Outdoor (Voltage drop or Noise)

Instant drop ----- Check if there is a large load electric apparatus in the same circuit.
Momentary power failure ----- Check if there is a defective contact or leak current in

the power supply circuit.
Noise ----- Check if there is any equipment causing harmonic wave near electric line.

(Neon bulb or electric equipment that may cause harmonic wave)
Check the complete insulation of grounding.

OK

Check Point 3 : Check Electrical Components

Check the voltage of power supply.

>> Check if AC198 - 264V appears at Outdoor Unit Terminal L - N.

YESYES

Check Fuse in Filter PCB.

>> If Fuse is open, check if the wiring between Terminal and Filter PCB
is loose, and replace Fuse.

Check Varistor in Filter PCB.

>> If Varistor is defective, there is a possibility of an abnormal power supply.
Check the correct power supply and replace Varistor.
Upon checking the normal power supply, replace Varistor.

OK

If the symptom does not change by above Check 3, replace Main PCB.

NO

02-29

Trouble shooting 28

AMP Air Conditioning

www.ampair.co.uk | [e-mail]

Outdoor Unit - No Power

Forecast of Cause:

1. Power Supply failure 2. External cause

3. Electrical Components defective

Check Point 1 : Check Installation Condition

Isn’t the breaker down?
Check loose or removed connection cable.

>>If abnormal condition is found, correct it by referring
to Installation Manual or Data & Technical Manual.

OKOK

Check Point 2 : Check external cause at Indoor and Outdoor (Voltage drop or Noise)

Instant drop ----- Check if there is a large load electric apparatus in the same circuit.
Momentary power failure ----- Check if there is a defective contact or leak current in the power supply circuit.
Noise ----- Check if there is any equipment causing harmonic wave near electric line.

(Neon bulb or electric equipment that may cause harmonic wave)
Check the complete insulation of grounding.

OKOK

Check Point 3 : Check Electrical Components

Check the voltage of power supply.

>> Check if AC198 - 264V appears at Outdoor Unit Terminal L - N.

YESYES

Check Fuse in Main PCB.

>> If Fuse is open, check if the wiring between Terminal and Main PCB is loose,
and replace Fuse.

YESYES

Check IPM. (PARTS INFORMATION 6)

>> If IPM is abnormal, replace Inverter PCB.

OK

If the symptom does not change by above Check 3, replace Main PCB.

NO

02-30

Trouble shooting 29

AMP Air Conditioning

www.ampair.co.uk | [e-mail]

Forecast of Cause:

1. Setting/ Connection failure 2. External cause

No Operation (Power is ON)

3. Electrical Component defective

Check Point 1 : Check indoor and outdoor installation condition

Indoor Unit - Check incorrect wiring between Indoor Unit - Remote Control.
Or, check if there is an open cable connection.

Are these Indoor Unit, Outdoor Unit, and Remote Control suitable model numbers to connect?

>> If there is some abnormal condition, correct it by referring to Installation manual and
Data & Technical Manual.

OK

Turn off Power and check/ correct followings.

Is there loose or removed communication line of Indoor Unit and Outdoor Unit?

OK

Check Point 2 : Check external cause at Indoor and Outdoor (Voltage drop or Noise)

Instant drop ----- Check if there is a large load electric apparatus in the same circuit.

Momentary power failure ----- Check if there is a defective contact or leak current in the power supply circuit.

Noise ----- Check if there is any equipment causing harmonic wave near electric line.
(Neon bulb or electric equipment that may cause harmonic wave)
Check the complete insulation of grounding.

OKOK

Check Point 3 : Check Wired Remote Controller and Controller PCB

Check Voltage at CN140 of Controller PCB. (terminal 1-3)
(Power supply to Remote Control)

>> If it is DC12V, Remote Control is failure. (Controller PCB is normal) >> Replace Remote Control
>> If it is DC 0V, Controller PCB is failure. (Check Remote Control once again) >> Replace Controller PCB

>> If the symptom does not change by above Check 1, 2, 3, replace Main PCB of Outdoor unit.

02-31

Trouble shooting 30

AMP Air Conditioning

www.ampair.co.uk | [e-mail]

No Cooling / No Heating

Forecast of Cause:

1. Indoor Unit error 2. Outdoor Unit error

3. Effect by Surrounding environment

4. Connection Pipe / Connection Wire failure 5. Refrigeration cycle failure

Check Point 1 : Check Indoor Unit

Does Indoor Unit FAN run on HIGH FAN?

Is Air Filter dirty?
Is Heat Exchanger clogged?
Check if Energy save function is operated.

OKOK

Check Point 2 : Check Outdoor Unit Operation

Check if Outdoor Unit is operating
Check any objects that obstruct the air flow route.
Check clogged Heat Exchanger.
Is the Valve open?

OKOK

Check Point 3 : Check Site Condition

Is capacity of Indoor Unit fitted to Room size?
Any windows open? Or direct sunlight ?

OKOK

Check Point 4 :
Check Indoor/ Outdoor Installation Condition

Check connection pipe
(specified pipe length & Pipe diameter?)

Check any loose or removed communication line.

>> If there is an abnormal condition, correct it by
referring to Installation Manual or Data & Technical
Manual.

OKOK

MPa MPa

Check Point 5 : Check Refrigeration Cycle

Check if Strainer is clogged (Refer to the figure at right).

Measure Gas Pressure and if there is a leakage, correct it.

>> When recharging the refrigerant, make sure to perform
vacuuming, and recharge the specified amount.

Check EEV (PARTS INFORMATION 3)

Check Compressor (PARTS INFORMATION 1,2)

Attention

Strainer normally does not have temperature difference
between inlet and outlet as shown in , but if there is a
difference like shown in , there is a possibility of inside
clogged. In this case, replace Strainer.

Pipe (In) Pipe (Out)

Pipe (In) Pipe (Out)

02-32

Trouble shooting 31

AMP Air Conditioning

www.ampair.co.uk | [e-mail]

Forecast of Cause :

1. Abnormal installation (Indoor/ Outdoor)

Abnormal Noise

2. Fan failure (Indoor/ Outdoor)

3. Compressor failure (Outdoor)

Diagnosis method when Abnormal Noise is occurred

Abnormal noise is coming from Indoor Unit.
(Check and correct followings)

Abnormal noise is coming from Outdoor Unit.
(Check and correct followings)

Is Main Unit installed in stable condition?
Is the installation of Air suction grille and
front panel normal?

OK

Is Fan broken or deformed?
Is the screw of Fan loose?
Is there any object which obstruct the Fan rotation?

Trouble shooting 32

Forecast of Cause:

Water Leaking

Is Main Unit installed in stable condition?
Is Fan Guard installed normally?

OK

Is Fan broken or deformed?
Is the screw of Fan loose?

Is there any object which obstruct the Fan rotation?

OK

Check if vibration noise by loose bolt or contact noise
of piping is happening.

OK

Is Compressor locked?

>> Check Compressor (PARTS INFORMATION 1,2)

1. Erroneous installation 2. Drain hose failure

Diagnosis method when water leak occurs

Is Main Unit installed in stable condition?
Is Main Unit broken or deformed at the time of
transportation or maintenance?

OKOK

Is Drain Hose connection loose?
Is there a trap in Drain Hose?

Is Drain Hose clogged?

OKOK

Is Fan rotating?

Diagnosis method when water is spitting out.

Is the filter clogged?

OKOK

Check Gas Pressure and correct it
if there was a gas leak.

MPa MPa

02-33

2-4 SERVICE PARTS INFORMATION

AMP Air Conditioning

www.ampair.co.uk | [e-mail]

SERVICE PARTS INFORMATION 1

Compressor

Diagnosis method of Compressor ( If Outdoor Unit LED displays Error, refer to Trouble shooting )

Does not start up

Is there open or loose connection
cable?

Check Main PCB, connection of
Compressor, and winding resistance.
(Refer to the next page).

>> If there is no failure, the defect of
Compressor is considered (Locked
compressor due to clogged dirt or
less oil)

Replace Compressor

Stops soon after starting up

Is there open or loose connection
cable?

Is Gas Pipe Valve open?
(Low Pressure is too low)

MPa MPa

Check if Refrigerant is leaking.
(Recharge Refrigerant)

Abnormal noise

Check if vibration noise by
loose bolt or contact noise
of piping is happening.

Defective Compressor
can be considered.
(due to inside dirt clogging
or broken component)

Replace Compressor

Check if Strainer is clogged.
(PARTS INFORMATION 3)

Check Main PCB, connection of Compressor,and winding
resistance. (Refer to the next page).

>> If there is no failure, the defect of Compressor can be
considered. (Compression part broken or valve defective.)

Replace Compressor

02-34

SERVICE PARTS INFORMATION 2

AMP Air Conditioning

www.ampair.co.uk | [e-mail]

Inverter Compressor

Check Point 1 : Check Connection

Check terminal connection of Compressor
(loose or incorrect wiring)

(WHITE)

S(V)

Inverter PCB

R(U)

C(W)

(RED)

(BLACK)

Check Point 2 : Check Winding Resistance

Check winding resistance of each terminal

If the resistance value is 0 or infinite, replace Compressor.

R

Resistance Value :

0.79 at 20°C

RED

INVERTER PCB

TM804

Compressor

TM806TM805

BLACK

WHITE

C

S

Check Point 3 : Replace Main PCB

If the symptom does not change with above Check 1, 2, replace Main PCB.

02-35

SERVICE PARTS INFORMATION 3

AMP Air Conditioning

www.ampair.co.uk | [e-mail]

Outdoor unit Electronic Expansion Valve
( EEV )

Check Point 1 : Check Connections

Check connection of connector
( Loose connector or open cable )

EXPANSION
VALVE COIL

EV

CN17

1
2
3
4
5
6

RED

1

BROWN

2

BLUE

3

ORANGE

4

YELLOW

5

WHITE

6

Check Point 2 : Check Coil of EEV

Remove connector, check each winding
resistance of Coil.

Read wire

Resistance value

Check Point 3 : Check Noise at start up

Turn on Power and check operation noise.

If an abnormal noise does not show,
replace Main PCB.

White - Red

Check Point 4 : Check Voltage from Main PCB.

Yellow - Brown
Orange - Red

46 4

at 20°C

Remove Connector and check Voltage (DC12V)

If it does not appear, replace Main PCB.

Blue - Brown

If Resistance value is abnormal, replace EEV.

Check Point 5 : Check Opening and Closing Operation of Valve

When Valve is closed,
it has a temp. difference between Inlet and Outlet.

CLOSE
Example : Hot Gas

If it is open,
it has no temp. difference between Inlet and Outlet.

OPEN
Example : Hot Gas

12V

CN17

1
2
3
4
5
6

1
2
3
4
5
6

RED
BROWN
BLUE
ORANGE
YELLOW
WHITE

DC

EV

Pipe (In)

Check Point 6 : Check Strainer

Strainer normally does not have temperature difference between inlet and outlet as shown in ,
but if there is a difference as shown in , there is a possibility of inside clogged. In this case, replace Strainer.

Pipe (In) Pipe (Out)

Pipe (Out)

Pipe (In)

Pipe (Out)

Pipe (In) Pipe (Out)

02-36

SERVICE PARTS INFORMATION 4

AMP Air Conditioning

www.ampair.co.uk | [e-mail]

Indoor unit fan motor

Check Point 1 : Check rotation of Fan

Rotate the fan by hand when operation is off.
(Check if fan is caught, dropped off or locked motor)

>>If Fan or Bearing is abnormal, replace it.

Check Point 2 : Check resistance of Indoor Fan Motor 1 or 2

Refer to below. Circuit-test "Vm" and "GND" terminal.
(Vm: DC voltage, GND: Earth terminal)

>>If they are short-circuited (below 300 k ), replace Indoor fan motor and Controller PCB.

Pin number
(wire color)

1 (Brown)
2 (Yellow)
3 (White)
4 (Black)
5
6 (Red)

Terminal function
(symbol)

Feed back (FG)
Speed command (Vsp)
Control voltage (Vcc)
Earth terminal (GND)
No function
DC voltage (Vm)

SERVICE PARTS INFORMATION 5

Outdoor unit fan motor

Check Point 1 : Check rotation of Fan

Rotate the fan by hand when operation is off.
(Check if fan is caught, dropped off or locked motor)

>>If Fan or Bearing is abnormal, replace it.

Check Point 2 : Check resistance of Outdoor Fan Motor 1 or 2

Refer to below. Circuit-test "Vm" and "GND" terminal.
(Vm: DC voltage, GND: Earth terminal)

>>If they are short-circuited (below 300 k ), replace Outdoor fan motor and Main PCB.

Pin number
(wire color)

1 (Red)
2
3 (Black)
4 (White)
5 (Yellow)
6 (Brown)

Terminal function
(symbol)

DC voltage (Vm)
No function
Earth terminal (GND)
Control voltage (Vcc)
Speed command (Vsp)
Feed back (FG)

02-37

SERVICE PARTS INFORMATION 6

AMP Air Conditioning

www.ampair.co.uk | [e-mail]

IPM
(Mounted on Inverter PCB)

Check Point 1

 Disconnect the connection wires between the Inverter
PCB - Capacitor PCB and Inverter PCB - Inverter
Compressor.

 Set the tester to the "Resistance" mode, and measure
the resistance between the following terminals.

TM802 (P) - TM804(U) / TM805(V) / TM806(W)
TM803 (N) - TM804(U) / TM805(V) / TM806(W)

 Judge the result of as follows:

Terminal

Tester(+) Tester(-)

P
P
P
U
V
W
N
N
N
U
V
W

U
V
W
P
P
P
U
V
W
N
N
N

Resistance value

Over 2k
(Including )

Over 20k
(Including )

Over 2k
(Including )

P

W

V

Check Point 2

Set the tester to the "Diode" mode, and measure the voltage value between the following terminals.

Judge the result of as follows:

NU

Terminal

Tester(+) Tester(-)

P
P
P
U
V
W
N
N
N
U
V
W

U
V
W
P
P
P
U
V
W
N
N
N

Tester display

0.3V 0.7V

02-38

SERVICE PARTS INFORMATION 7

AMP Air Conditioning

www.ampair.co.uk | [e-mail]

Thermistor

Check Point : Check Thermistor resistance value

Remove connector and check Thermistor resistance value.

Temperature

[°C]

- 30

- 25

- 20

- 15

- 10

- 5
0
5
10
15
20
25
30
40
50
60
70
80
90
100
110
120

Applicable
Thermistors

Thermistor A Thermistor B Thermistor C Thermistor D

1013.1

729.1

531.6

392.3

292.9

221.1

168.6

129.8

100.9

79.1

62.5

49.8

40.0

26.3

17.8

12.3

8.7

6.3

4.6

3.4

2.6

2.0

Discharge temp. TH
Compressor temp. TH

Resistance Value [ k ]

95.6

68.9

50.3

37.2

27.8

21.0

16.1

12.4

9.6

7.6

6.0

4.8

3.8

2.5

1.7

1.2

0.8

0.6

---

---

---

---

Heat exchanger. TH
(MID/ OUT)

224.3

159.7

115.2

84.2

62.3

46.6

35.2

26.9

20.7

16.1

12.6

10.0

8.0

5.2

3.5

2.4

1.6

1.2

---

---

---

---

Outdoor temp. TH Heat sink temp. TH

94.3

67.9

49.6

36.7

27.4

20.7

15.8

12.2

9.5

7.5

5.9

4.7

3.8

2.5

1.7

1.2

0.8

0.6

0.4

---

---

---

(PFC/ INV)

02-39

SERVICE PARTS INFORMATION 8

AMP Air Conditioning

www.ampair.co.uk | [e-mail]

Discharge Pressure Sensor

1. Discharge Pressure Sensor

Check Point : Check Voltage from Main PCB

With the connector connected to the PCB, measure the voltage between
CN16:1-3 of the Main PCB.

DC

DC

CN16

1 1
2 2

3

3

RED

WHITE
BLACK

Characteristics of pressure sensor

4.5

2.5

Output [DCV]

0.5
0

2.5

5.0

Pressure [MPa]

PS

PRESSURE
SENSOR

02-40

AMP Air Conditioning

www.ampair.co.uk | [e-mail]

DUCT type

AMP Air Conditioning

www.ampair.co.uk | [e-mail]

INVERTER

R410A

3 . DISASSEMBLY PROCESS

DISASSEMBLY PROCESS

AMP Air Conditioning

www.ampair.co.uk | [e-mail]

MODEL : AR* G60LHTA

1. Appearance

FRONT VIEW

2. CONTROL BOX COVER removal

screw

SIDE VIEW

BACK VIEW

Hook

1) Remove the mounting screws
(4 places).

2) Remove the control box cover.

3. POWER SUPPLY PCB, CONTROLLER PCB and FILTER PCB removal

POWER SUPPLY PCB

CONTROLLER PCB

FILTER PCB

3-1. POWER SUPPLY PCB removal

AMP Air Conditioning

www.ampair.co.uk | [e-mail]

locking spacers

1) Remove the connectors and each wires.

3-2. CONTROLLER PCB removal

1) Remove the connectors and each wires.

3-3. FILTER PCB removal

2) Remove the locking spacers(4 places).

locking spacers

2) Remove the earth screw
and locking spacers(4 places).

earth screw

1) Remove the connectors,
each wires and
terminal wire (black,white,red).

screw

2) Remove the mounting screws
(2 places).

Hook

earth
screw

3) Remove the terminal bracket.

locking spacers

4) Remove the earth screw
and locking spacers(5 places).

4. FAN MOTOR removal

AMP Air Conditioning

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screw

screw

1) Remove the mounting screws(13 places).

Tape

screw

screw

2) Remove the PANEL TOP ASSY.

screw

4) Remove the mounting screws(4 places).

3) Peel off the tapes.

Reuse the tape.

screw

5) Pull the CASING.

6) Loosen the MOTOR SHAFT screw. 7) Slide the left with the SIROCCO FAN and CASING.

MOTOR SHAFT

03-03

hook

AMP Air Conditioning

www.ampair.co.uk | [e-mail]

screw

8) Take out the SIROCCO FAN
and CASING.

9) Loosen the screw.

Note at the installation.

Please install it so that a motor band touches rubber.

NGOK

Insert SIROCCO FAN and MOTOR SHAFT reference D cutting position.
Please insert it till a SIROCCO FAN stop.

Unlock the point.

1) Insert it till a SIROCCO FAN stop.

5. SIROCCO FAN removal

screw

1) Remove the screws(4 places).

MOTOR SHAFT

2) Tighten the screw.

hook

2) Take it out the SIROCCO FAN.

03-04

6. THERMISTOR removal

AMP Air Conditioning

www.ampair.co.uk | [e-mail]

6-1 PIPE THERMISTOR

screw

1) Remove the mounting
screws(4 places)

6-2 ROOM THRMISTOR

7. DRAIN PAN removal

2) Remove the PIPE PANEL.

3) Remove the
THERMISTOR SPRING.

Remove the THERMISTOR.

4) Remove the
THERMISTOR.

screw

1) Remove the mounting
screws(2 places)

Attention!!

When remove the screw,
please affix and remove the hand.

2) Remove the DRAIN PAN.

03-05

1116,Suenaga,Takatsu-ku,Kawasaki 213-8502,Japan

AMP Air Conditioning

www.ampair.co.uk | [e-mail]

Apr. 2013 Printed in Japan