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Cycle Troubleshooting Guide
Trouble analysis
1. Check temperature difference between intake and discharge air and operating current.
Temp. Difference
Temp. difference
: approx. 0°C
Current
: less than 80% of
rated current
Temp. difference
: approx. 8°C
Current
: less than 80% of
rated current
Temp. difference
: less than 8°C
Current
: over the rated
current
Temp. difference
: over 8°C
Operating Current
All amount of refrigerant leaked out
Check refrigeration cycle
Check refrigeration cycle
Refrigerant leakege
Clog of refrigeration cycle
Defective compressor
Clog of refrigeration cycle
Defective compressor
Excessive amount of refrigerant
Normal
Notice :
Temperature difference between intake and discharge air depends on room air humidity. When the room air
humidity is relativery higher, temperature difference is smaller. When the room air humidity is relatively lower
temperature difference is larger.
Temperature difference between intake and discharge air depends on room air humidity. When the room air
humidity is relativery higher, temperature difference is smaller. When the room air humidity is relatively lower
temperature difference is larger.
2. Check temperature and pressure of refrigeration cycle.
Notice :
1. The suction pressure is usually 4.5~6.0 kg/cm
1. The suction pressure is usually 4.5~6.0 kg/cm
2
G at normal condition.
2. The temperature can be measured by attaching the thermometer to the low pressure tubing and wrap it with
putty.
Suction pressure
Temperature
(Compared with
(Compared with
Cause of Trouble
Description
the normal value)
the normal value)
Defective compressor
Current is low
Defective 4-way reverse valve
Excessive amount of
High pressure does not quickly
Normal
refrigerant
rise at the beginning of
operation
operation
Insufficient amount of
Current is low
Lower
Higher
refrigerant (Leakage)
Clogging
Clogging
Current is low
High
Higher
–49–
Electronic Parts Troubleshooting Guide
: The unit does not operate.
Possible Trouble 1
–50–
YES
YES
YES
NO
YES
Is the input voltage
of transformer AC220V?
Is the input voltage
of IC01D DC14V?
Check the FUSE
and the wiring diagram
Check the RY-COMP PIN 3
and CN-4WAY PIN 1
and the wiring diagram
Check the RY-COMP PIN 3
and CN-4WAY PIN 1
Is the output voltage
of IC01D DC12V?
Is the PIN 29 of
Micom DC5V?
Exchange Micom
YES
NO
Check the main P.C.B
pattern
pattern
NO
NO
Exchange D01D-D05D
NO
YES
Exchange
the transformer
the transformer
Is shorted the
transformer output?
NO
YES
Is the output voltage
of IC02D DC5V?
NO
Is the PIN 55,64 of
Micom DC5V?
YES
Exchange IC01D
Exchange IC02D
NO
Check the 5V P.C.B
pattern
pattern
Is the output voltage
of transformer about AC14V?
Exchange IC01A
–51–
Possible Trouble 2
: The indoor fan does not operate.
NO
NO
YES
NO
Is it DRY mode?
Is it the HOT
mode?
Is IC02M operated
normally?
Check the fan motor
and connector.
(CN-FAN)
and connector.
(CN-FAN)
YES
Is the each S.S.R
any problem?
YES
NO
YES
Adjust set temperature
Does the temperature
set all right?
NO
Adjust set temperature
Does the temperature
set all right?
NO
YES
YES
Exchange IC02M
Exchange S.S.R
–52–
Possible Trouble 3
: Up/Down Air direction louver does not operate.
Possible Trouble 4
: Remote controller does not operate.
YES
NO
YES
Is IC01M operated
normally?
Is the PIN 1 of
CN-UP/DOWN DC12V?
Check the step motor
and connector
(CN-UP/DOWN 1,2)
and connector
(CN-UP/DOWN 1,2)
Check the main P.C.B
DC12V pattern
DC12V pattern
NO
Exchange IC01M
NO
YES
YES
YES
Is the battery consumed
much?
Is the PIN 8 of CN-DISP
DC5V?
Is the connection of
CN-DISP all right?
Exchange receiver ass'y
Connect CN-DISP exactly
NO
NO
Exchange the battery
Check the main P.C.B
DC5V pattern
DC5V pattern
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