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25

Function

NO

Description

Detection 

time

Restart 

condition

Restart 

times

Indoor Outdoor

Operation

Self diagnostic

display

1

2

3

4

5

6

7

Indoor fan 
lock

Indoor fan 
rpm error

Indoor 
freezing 
guard

Indoor 
overheating 
control

DC 
overcurrent

AC 
overcurrent

Compressor 
overheating 
control

Compressor 
high 
temperature 
error

Stops operation if no revolution pulse 
signal is input from the indoor fan motor for 
one minute.

Stops operation if the revolution pulse 
signal from the indoor fan indicates low 
rpm (approximately 300 rpm or less).

Lowers the operating frequency if the 
temperature of the indoor heat exchanger 
goes below 5

°

C during cooling. Stops the 

compressor if the temperature stays below 
0

°

C for 4 minutes.

Lowers the operating frequency if the 
temperature of the indoor heat exchanger 
rises above the overheating temperature 
during heating. Stops the compressor if the 
temperature stays above the overheating 
temperature for 1 minute at minimum 
frequency or less.
Set values for overheating temperature

During normal operation: 45

°

C to 54

°

C

During full power operation: 47

°

C to 

58

°

C

Stops the compressor if a current of 
approximately 23A or more flows in the 
power transistor module. 

Lowers the operating frequency if the 
compressor AC current exceeds 
set value(   ).Show "2-2(1)AC peak control"
Stops the compressor if the current 
exceeds at 40Hz or less set value(   ).

Lowers the operating frequency if the 
temperature of the compressor chamber 
thermistor (TH1) rises above 105

°

C.

Stops the compressor if the thermistor 
stays above 105

°

C for 1 minutes at 

minimum frequency or less.

Stops the compressor if the compressor 
chamber thermistor is above 114

°

C.

(Or when TH1 shorts)

When indoor 
fan is revolving

During cooling 
and dry 

During heating

During 
compressor 
operation

During 
compressor 
operation

During 
compressor 
operation

During 
operation

Operation OFF

Automatically 
restarts when the 
exchange 
temperature rises 
above the freezing 
prevention 
temperature (above 
2

°

C)

Automatically 
restarts when the 
exchange 
temperature goes 
below the 
overheating 
temperature.

Automatically 
restarts after safety 
time (170 seconds) 

Automatically 
restarts after safety 
time (170 seconds)

Automatically 
restarts after safety 
time (170 seconds)

Automatically 
restarts when 
thermistor (TH1) 
temperature falls 
below 100

°

C 

(approximately 30 
minutes)

No limit

No limit

No limit

8times

4 times

No limit

4 times

Yes

No

No

Yes

Yes

No

Yes

No

No

No

Yes

Yes

No

Yes

(   )

M o d e l

S e t  

v a l u e

C o o l

H e a t

6 . 2 A

6 . 7 A

5 . 3 A

5 . 4 A

7 . 9 A

1 0 . 5 A

5 . 3 A

6 . 2 A

7 . 9 A

A E - X 0 8 C R

A E - X 1 0 C R

A E - X 1 3 C R

A U - X 0 8 C R

A U - X 1 0 C R

A U - X 1 3 C R

26

Function

NO

Description

Detection 

time

Restart 

condition

Restart 

times

Indoor Outdoor

Operation

Self diagnostic

display

8

9

10

11

12

13

14

15

16

Outdoor heat 
exchanger
overheating 
control

Outdoor 
thermistor 
short

Outdoor 
thermistor 
open

AC abnormal 
current error

Serial signal 
error

Power factor 
module
(Active filter) 
error

Rotation error
of the 
compressor

Open circuit 
of the power 
module (IPM) 
heat-sink 
thermistor

Overheat of 
the power 
module (IPM) 
or short 
circuit of the 
power 
module (IPM) 
heat-sink 
thermistor

Lowers the operating frequency if the 
temperature of the outdoor heat exchanger 
rises above 55

°

C during cooling. Stops the 

compressor if the temperature stays above 
55

°

C for 1 minute at minumum frequency.

Stops the compressor if an outdoor 
thermistor (excluding TH1) shorts.

Stops the compressor if the circuit of an 
outdoor thermistor breaks.

Stops the compressor if if the operating 
frequency is above 50 Hz and the 
compressor current is below 1.0 A.

Turns the compressor relay off if the indoor 
unit does not receive a serial signal from 
the outdoor unit for 8 minutes.

Stops the compressor if the outdoor unit 
does not receive a serial signal from the 
indoor unit for 30 seconds.

When an power factor module error input 
is detected.

When abnormalities occur to a position 
detected signal.

Stops the compressor if the circuit of the 
heat-sink thermistor.

Stops the compressor if the temperature of 
the power module is (IPM) is exceeds 
90˚C. Also stops the compressor if the 
heat-sink thermistor shorts.

During 
compressor 
operation

When 
compressor is 
activated

When 
compressor is 
activated

During 
compressor 
operation

During 
operation

During 
operation

During 
compressor 
operation

Under feedback 
operation of 
compressor 
operation

When 
compressor is 
activated

During 
compressor 
operation

Automatically 
restarts after safety 
time (170 seconds)

Automatically 
restarts after safety 
time  (170 seconds)

Automatically 
restarts after safety 
time  (170  seconds)

Automatically 
restarts after safety 
time  (170 seconds)

Automatically 
restarts less than 8 
minutes after 
operation stops

Restarts after 
reception of serial 
signal

Automatically 
restarts after safety 
time  (170 seconds)

Automatically restart 
after safety time 
(170 seconds)

Automatically 
restarts after safety 
time (170 seconds)

Automatically 
restarts after safety 
time (170 seconds)

No limit

4 times

4 times

4 times

No limit

No limit

4 times

8 times

4 times

4 times

No

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

No

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

27

Self-diagnostic procedure using display mode

If the timer lamp blinks during operation, the problem can be diagnosed using the following table.

: Blinks at 2-second intervals

: OFF

: ON

: Blinks 3 times at 0.2-second intervals

The error of outdoor unit

Display by indoor unit operation lamp

Displayed in a pattern which comes on at  the same 

time as the timer lamp

4 seconds off

What to check, procedure

Display by 

outdoor 

unit lamp 

LED 1

Diagnosis

Solution

Condition 

of indoor 

and 

outdoor 

unit

Normal

Twice

3 times

4 times

5 times

6 times

7 times

DC overcurrent error

AC overcurrent error

Normal

Overheat of the power

module or short circuit

of the heatsink 

thermistor.

1. Check the circuit in the power transistor module.

2. Is the outdoor fan revolving ?

1. Is the discharge outlet of the outdoor unit clogged ?

1. Measure the resistance of heatsink thermistor TH6 on the heatsink 

    in outdoor unit.

2. Check rotation of the fan motor in outdoor unit.

3. Is the power supply voltage at least 198V at full power operation ?

1. Measure the resistance of thermistor TH2 on the outdoor unit

    (see Figure 3).

1. Replace power transistor 

module

1. Clear the discharge outlet.

11 times

Power factor module error

1. CHeck wiring of power factor module.

1. Replace the power factor module.

1. Reattach.

2. Reattach CN101 and CN102, 

    otherwise replace power transistor 

    module assembly or outdoor control 

    board assembly.

9 times

14 times

13 times

Rotation errot of the 

compressor

1. Has not if escaped from the compressor CN6 ?

2. Is the power supplied of 15V and 6V supplied to the IPM PWB.

1. Replace the heatsink thermistor.

Open circuit of the 

heatsink thermistor.

1. Are the connectors of the heatsink thermistor in outdoor unit well 

    attached ?

2. Measure the resistance of thermistor TH6 on the heatsink. 

    (See Figure 3).

Overheat of the comp-

ressor error

(protector operating) or 

outdoor compressor  

thermistor TH1 short

1. Reattach.

2. Replace the heatsink thermistor.

1.

Replace the outdoor control board 

assembly 

(Current transformer wire break.) 

1. Reattach.

2.

Replace the outdoor thermistor 

assembly.

1.

Replace the outdoor thermistor 

assembly.

1.

Clear the discharge outlet.

2.

Assure power supply voltage.

3.

Refill to rated amount.

4.

Replace the outdoor ther-mistor 

assembly.

5.

Replace the indoor control 

board 

assembly or only TH2.

1. Can voltage be detected at the current transformer on the outdoor 

unit control board?

1.  Is the connector of the outdoor unit thermistors well attached ?

     (see Figure 3).

2. Measure the resistance of thermistors TH1 and TH2 on the 

outdoor unit (see Figure 3).

1. Is the discharge outlet of the outdoor unit clogged ?

2. Is the power supply voltage at least 198 V at full power operation ?

3. Check for refrigerant leaks at the tubing connections.

4. Measure the resistance of compressor thermistor TH1 on the 

outdoor unit (see Figure 3).

5. Measure the resistance of heat exchanger pipe thermistor TH2 on 

the indoor unit (see Figure 1).

AC abnormal current  

error

Open circuit of the 

outdoor thermistor error

Short circuit of the  

outdoor thermistor error

2.

Reattach CN3, otherwise replace 

    the fan motor of outdoor unit.

    3. Assure power supply voltage.

28

Note:

1.

Normal : Only the timer lamp blinks. Error : Displayed by blinking of run

               lamp (above table).

2.

If the power plug is removed from the outlet or the breaker is switched to

               "OFF", the self-diagnostic memory will be erased.

3.

Example of outdoor unit LED 1 blinking :

: Blinks at 2-second intervals

: OFF

: ON

: Blinks 3 times at 0.2-second intervals

The error of indoor unit

Display by indoor unit operation lamp

Displayed in a pattern which comes on at  the same 

time as the timer lamp

4 seconds off

What to check, procedure

Display by 

outdoor 

unit lamp 

LED 1

Diagnosis

Solution

Condition 

of indoor 

and 

outdoor 

unit

Serial short

Serial open

1. Check the wiring between units.

1. Check the wiring between units.

1. Check the wiring between units.

2. Check the fuse in the outdoor unit.

3. Indoor control board.

4. Outdoor control board.

1. Rewire.

1. Rewire.

Indoor fan out of order

1. Is the fan motor locked ?

2. Is the wiring connector firmly fitted ?

3. Is the speed signal applied to the motor ?

Outdoor power supply  

does't turn on.

Wiring mistake.

1. Rewire.

2.

Replace the fuse, replace the 

outdoor board assembly.

3. Replace the board.

4. Replace the board.

1. Replace fan motor

2. Reattach.

3.

Replace the indoor control board 

assembly.

1

sec.

1

sec.

0.6

sec.

1

sec.

1

sec.

1

sec.

1

sec.

1

sec.

1

sec.

Overheat of the compressor

0.6

sec.

1

sec.

0.6

sec.

1

sec.

0.6

sec.

2 times

OFF

ON

OFF