Responding To Error Display On The Remote Controller; 1-Pqhy; Mechanical System - Mitsubishi Electric City Multi PQHY-P72 Service Handbook

[ IX Troubleshooting ]

[2] Responding to Error Display on the Remote Controller

-1- PQHY

1. Mechanical system

Error Code
0403 Serial commu-
nication error
Refer to section -7-"Inverter " under part [4] "Trouble shooting principal parts" for error codes related to the inverter.
Error definition and error
detection method
Serial communication er- (1) Faulty wiring
ror between the main
board and the INV board
on the compressor, and
between the main board
and the inverter board
(2) Inverter address switch
Detail code 01:
Between the main board
(3) Compressor INV board
and the compressor INV
board
Cause
setting error
failure
- 182 -
Check method and remedy
Check the connection between the
Main board connector CNRS3B and
compressor INV board connector
CNRS1, and check connector con-
nections.
Check the setting for SW2-1 on the
inverter board on the compressor.
Replace the compressor INV board
if problem persists after power reset.