Responding To Error Display On The Remote Controller; Error Code 0403 - Mitsubishi Electric PQHY-P72TYHMU-A Service Handbook

[ IX Troubleshooting ]

[2] Responding to Error Display on the Remote Controller

1. Error Code
0403
Serial communication error
2. Error definition and error detection method
Serial communication error between the control board and the INV board on the compressor.
Detail code 01: Between the control board and the INV board
3. Cause, check method and remedy
(1) Faulty wiring
Check the following wiring connections.
1) Between Control board and Fan board
Control board FAN board
CN2
CN21
CN4
CN4
CN332
CN18V
2) Between Control board and INV board
Control board INV board
CN2 CN2
CN4 CN4
(2) INV board failure and Control board failure
Replace the INV board or the Fan board when the power turns on automatically, even if the power source is reset.
Refer to section -6- "Inverter" under part [4] Troubleshooting Principal Parts for error codes related to the inverter.
HWE09080 - 230 - GB