Responding To Error Display On The Remote Controller; Serial Communication Error - Mitsubishi Electric PUHY-RP200 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, and between the control board
and the Fan board
Detail code 01: Between the control board and the INV board
Detail code 05: Between the control board and the Fan 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
CN5
CN332
CN18V
2) Between Fan board and INV board
FAN board INV board
CN22 CN2
CN5V
CN4 CN4
(2) INV board failure, Fan board failure and Control board failure
Replace the INV board or the Fan board or control 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.(page 234)
HWE10010 - 154 - GB