Mitsubishi Electric M Series Manual page 547

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