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Check I/F P.C. board.
NO
YES
Check power voltage and line.
Correct power line.
Check external noise, etc.
Is there any trouble of
outdoor unit power supply?
Check code name
[F31]
Check code name
Outdoor EEPROM error
Cause of operation
1. Outdoor unit power error (Voltage, noise, etc.)
2. Outdoor I/F P.C. board error
YES
YES
YES
YES
YES
NO
NO
NO
NO
NO
Is power voltage of outdoor unit normal?
Is not it an abnormal overload?
Check IPDU P.C. board.
Is winding resistance
between phases of corresponding
compressor normal? (Note 1)
Does voltage drop occur
when other compressor starts?
Is connection of wiring or connection of
connector on IPDU P.C. board normal?
Correct power line.
Correct connector connection or wiring.
Correct cause of overload.
Compressor error
(Motor burning, etc.)
Note 1
* After checking the output, when connecting the compressor
lead again to the compressor terminal, check surely there is
no distortion on the Fasten receptacle terminal.
If it is loosened, caulk it with pinchers, etc and then connect
lead to the terminal firmly.
380 – 415V ± 10%
Take off lead cable of compressor.
1. Check resistance between windings:
It is normal if there are 0.7
to 0.9 .
2. Check insulation between outdoor
cabinet and terminal:
It is normal if there are 10M
or more.
Check code name
[H01]
Check code name
Compressor breakdown
Cause of operation
1. Outdoor unit power line error
2. Compressor circuit system error
3. Compressor error
4. Cause of abnormal overload operation
5. IPDU P.C. board error
Auxiliary code : 01: Compressor 1 side 02: Compressor 2 side
Details of compressor
power connecting section
S
C
R
Check code name
[H02]
Check code name
Compressor error (Lock)
Cause of operation
1. Outdoor unit power line error
2. Compressor circuit system error
3. Compressor error
4. Refrigerant stagnation in compressor shell
5. IPDU P.C. board error
Auxiliary code : 01: Compressor 1 side 02: Compressor 2 side
YES
YES
YES
YES
YES
YES YES
NO
NO
NO
NO
NO
NO
NO
Operation starts.
Is compressor normal? 2
Check IPDU P.C. board.
Is not it an abnormal overload?
Is case heater output normal?
Is power voltage of
outdoor unit normal?
1
Does voltage drop occur
when other compressor starts?
Is wiring or connector connection
on IPDU P.C. board normal?
Is there no refrigerant stagnation
in compressor shell?
Correct power line.
Correct cause of overload.
Compressor error
Correct connector connection
or wiring.
Correct refrigerant stagnation
in compressor shell.
1 380 – 415V ± 10%
2 Check the following items mainly.
1. Existence of abnormal sound and abnormal vibration during operation or starting
2. Abnormal overheat of case during operation or stop time (Never touch with hands.)
3. Current of compressor lead during operation or starting time
(No varied change of current) change
3 If OCR operates even after manual reset of OCR, check whether the wiring to the
current sensor (T02) of Comp-IPDU is correct or not.
Check case heater.
YES
NO
Does OCR of MG-SW operate?
Reset OCR manually.
3
YES
NO
Check IPDU P.C. board.
Correct connector connection or cabling.
Wiring or connector connection
on IPDU P.C. board normal?
Auxiliary code : 01: Compressor 1 side 02: Compressor 2 side
Check code name
[H03]
Check code name
Current detective
circuit system error
Cause of operation
1. Cabling or connector connection error on IPDU P.C. board
2. IPDU P.C. board error