50
OCH733
Check code
Abnormal points and detection methods
Causes and checkpoints
If serial communication between the outdoor controller board and outdoor
power board is defective.
1
Wire breakage or contact failure of connector CN2 or
CN4
2
Malfunction of power board communication circuit on
outdoor controller board
3
Malfunction of communication circuit on outdoor
power board
●Diagnosis of defects
Make sure to turn the power OFF before connecting/disconnecting any connectors, or replacing boards.
Diagnosis
Remedy
0403
(Ed)
Serial communication error
No
Yes
Are they connected normally?
Check the connection of the communication
line (CN2 and CN4) between the outdoor
controller board and power board.
Connect the CN2 and CN4 properly.
Replace them in case of breakage.
The communication circuit of either the
outdoor controller board or power board is
defective.
If unable to identify the defective circuit;
Replace the outdoor controller board if it
does not recover.
Replace the outdoor power board.
8-1-3. SELF-DIAGNOSIS ACTION BY FLOWCHART
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