Mitsubishi Electric Mr. Slim MUZ-D30NA Service Manual

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The left lamp of OPERA-
TION INDICATOR lamp
(Indoor unit)
Abnormal point
(Failure mode / protection)
LED indication (Out-
door P.C. board)
Condition Correspondence
Indoor/outdoor
unit failure mode
recall function
LED 1 LED 2
11-time ash
Converter 5 times Goes out
A failure is detected in the operation of the converter dur-
ing operation.
• Check the voltage of
power supply.
Replace the power board.
Bus-bar voltage (1) 5 times Goes out
The bus-bar voltage exceeds 400 V or falls to 200 V or
below during compressor operating.
Bus-bar voltage (2)
Even if this protection stop
is performed continuously 3
times, it does not mean the
abnormality in outdoor power
system.
6 times Goes out
The bus-bar voltage exceeds 400 V or falls to 50 V or
below during compressor operating.
• Check the voltage of
power supply.
• Replace the outdoor
electronic control P.C.
board.