Error Code Definitions And Solutions: Codes [0 - 999]; Error Code [0403] - Mitsubishi Electric PUHY-P250YNW-A Service Handbook

[7-2 Error Code Definitions and Solutions: Codes [0 - 999] ]

7-2

Error Code Definitions and Solutions: Codes [0 - 999]

7-2-1

Error Code [0403]

1. Error code definition
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 1: Between the control board and the INV board
Detail code 5, 6: 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
CN4A
Power supply
CNFAN1
2) Between control board and INV board
Control board
CN4
3) Between power-supply board and INV board
Power-supply
board
CNINV
(2) PS board failure
Replace the PS board if the LED on the INV board, Fan board, or control board is not lit.
(3) INV board failure, Fan board failure and Control board failure
If the problem persists after a power reset, replace the INV board, FAN board, or control board.
(4) Incorrect setting of the medium pressure sensor kit
See the medium pressure sensor installation manual for how to reset the setting.
BS_07_C
FAN board
CN80
FAN board
CN81
INV board
CN2
INV board
CN19V
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