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Check
code
Outdoor
LED display
Check and troubleshooting
(Item without special mention Indicates part of outdoor unit.)
[H03]
[Current detection circuit trouble]
Are CN609 connection and
case thermostat correct?
Check outdoor P.C. board (MCC-1698).
Failure
→
Replace
[H04]
[Case thermostat operation]
NO
Open service valve fully.
NO
YES
YES
Check compressor CDB P.C. board.
Failure
→
Replac
* When replacing Compressor CDB
P.C.board, replace the fuse.
NO
When shorting the case
thermostat, can you perform
the cooling/heating operation?
NO
Correct connector.
Case thermostat trouble
→
Replace
Replace the PMV.
Is there gas leak?
Is there refrigerant shortage?
YES
Fault part repair.
Recharge refrigerant.
Is service valve fully opened?
NO
Check crushed or broken pipe.
Fault part repair
YES
YES
Is PMV normal?