Mitsubishi Electric City Multi CMB-P1016NU-G, Service Handbook

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