MULTI TYPE

Check code Check code name
Cause
[H03] / [17]
(AI-NET)
Current detective circuit system
error
1. Wiring or connector connection error on A3-IPDU
P.C. board
2. A3-IPDU P.C. board error
Sub-code:
01: Compressor 1,
02: Compressor 2,
03: Compressor 3
Wiring or
connector
connection on
IPDU P.C. board
normal?
No
Correct connector connection
or wiring.
Yes
Check IPDU P.C. board.
Check code Check code name
Cause
[H02] / [1d]
(AI-NET)
Compressor error (Lock)
1. Outdoor unit power line error
2. Compressor circuit system error
3. Compressor error
4. Refrigerant stagnation in compressor shell
5. A3-IPDU P.C. board error
6. MG-CTT error
Sub-code:
01: Compressor 1,
02: Compressor 2,
03: Compressor 3
Is power voltage
of outdoor unit
normal? *1
Yes
No
*1: 380-415V ± 10%
Correct power line.
Does voltage drop
occur when other
compressor
starts?
No
Yes
Is wiring
or connector
connection on A3-
IPDU P.C. board
normal?
Yes
No
Correct connector connection
or wiring.
Is MG-CTT normal? *2
No
Exchange MG-CTT
Yes
*2 Check connection wiring
Check operation of MG-CTT
Check the short circuit of MG-CTT
Yes
Abnormal overload? Correct cause of overload.
No
Is there no
refrigerant stagnation
in compressor shell?
Yes
Is case heater output
Yes
normal?
Correct refrigerant stagnation
in compressor shell.
No No
Operation starts. Check case heater.
Is compressor
normal? *3
Yes
Check A3-IPDU P.C. board.
No
*3 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 sudden change of current?)
Compressor error
MG-CTT: Magnet contactor
205