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[E04 error]
Correct connection of connector.
Replace IPDU.
Check indoor P.C. board.
Defect → Replace
Check item code [14].
Correct inter-unit cable.
Correct connection of connector.
Check/Correct charged
refrigerant amount.
Check indoor P.C. board.
Defect → Replace
Replace IPDU.
Correct connection of connector.
∗ As shown in the following figure, perform measurement
within 20 seconds after power ON.
Black
White
3
2
1
Inter-terminal block
S5277G
Does outdoor unit operate?
Is setup of group address correct?
Does case thermo. operate?
Is case thermo (CN500) connected?
Is power DC280V supplied to CDB? (CN03)
Are 1, 2, 3 inter-unit cables normal?
Are connections from connectors
of inter-terminal blocks (1, 2, 3)
of indoor/outdoor units normal?
Is DC280V applied between
terminals of the electrolytic condenser
of IPDU main circuit?
Does voltage between
2 and 3 of inter-terminal blocks (1, 2, 3)
of indoor unit vary?∗
Is power DC7V supplied to CDB?
Are wiring between (CN800)
2
pin
and
5
pin, and wiring between
IPDU and CDB correct?
CN06 ↔ CN800
NO
NO
NO
NO
NO
NO
NO
NO
NO
NO
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES