Mitsubishi Electric M-SERIES, Manual

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M series MULTI SYSTEM Inverter Heat Pump
MUL
TI
SYSTEMS
TROUBLESHOOTING
C-545
MXZ-3B/4B/5B
11-time flash
15-time flash
The communication between boards
protection stop is continuously
performed twice.
Communication error occurs
between the electronic control P.C.
board and power board for more
than 10 seconds.
Current sensor protection stop is
continuously performed twice.
A short or open circuit is detected in
the current sensor during compressor
operating.
The protection stop of the zero cross
detecting circuit is continuously
performed 10 times.
Zero cross signal cannot be detected
while the compressor is operating.
A failure is detected in the operation
of the converter during operation.
The bus-bar voltage exceeds 400 V or
falls to 200 V or below during
compressor operating.
The bus-bar voltage exceeds
400 V ( MXZ-3B54/3B68/4B71VA )
430 V ( MXZ-4B80/5B100VA )
or falls to 50V or below during
compressor operating.
Communication error
between P.C. boards
Current sensor
Zero cross detecting circuit
Converter
Bus-bar voltage
(1)
Bus-bar voltage
(2)
Even if this protection stop is
performed continuously three
times, it does not mean the
abnormality in outdoor power
system.
LEV for drain
Lighting 6 times
Lighting 7 times
5 times Goes
out
5 times Goes
out
5 times
6 times
Goes
out
Goes
out
The indoor unit detects any
abnormalities in the LEV for drain.
Lighting Lighting
Abnormal point
(Failure mode / protection)
Condition
Indoor/outdoor
unit failure mode
recall function
LED indication
(Outdoor P.C. board)
LED 1 LED 2
Upper or left lamp of
OPERATION INDICATOR
lamp (Indoor unit)