Check code
Abnormal points and detection methods Causes and check points
Abnormal if serial communication between the outdoor controller board
and outdoor power board is defective.
Wire breakage or contact failure of connector CN2 or
CN4
Malfunction of power board communication circuit on
outdoor controller board
Malfunction of communication circuit on outdoor
power board
●Diagnosis of defectives
Make sure to turn the power OFF before connecting/disconnecting any connectors, or replacing boards.
Diagnosis Remedy
0403
Serial commucication 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 a 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
doesn't recover,
Replace the outdoor power board
3333
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