Mitsubishi Electric PU(H)Y-P250YGM-A, Руководство по обслуживанию

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[
IX
Troubleshooting ]
[2] Responding to Error Display on the Remote Controller
1. Mechanical system
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 on
the fan
Detail code 01:
Between the main board
and the compressor INV
board
Detail code 05:
Between the main board
and the FAN INV board (1) Faulty wiring Check for wiring between the con-
nector (CNRS3B) on the main board
and the connector (CNRS1) on the
compressor INV board or between
the connector (CNRS3A) on the
main board and the connector
(CNRS2) on the FAN INV board and
check contact of the connectors.
Check for contact of the connector
(CNAC3) on the main board or of the
connector (CNTR) on the FAN INV
board.
(2) Inverter address switch
setting error
Check the setting for SW2-1 on the
inverter board on the compressor.
Confirm that the SW2-1 on the fan
inverter board is set to ON.
(3) Transformer failure Measure voltages between pins 1
and 3 of the male connector (CNTR)
on the FAN INV board.
(4) Compressor INV board
failure
FAN INV board failure.
Replace the compressor INV board
or the FAN INV board when the pow-
er turns on automatically, even if the
power source is reset.