Mitsubishi Electric M Series Manual page 545

M series
Upper or left lamp of
Abnormal point
OPERATION INDICATOR
(Failure mode/protection)
lamp (Indoor unit)
11-time flash Current sensor
Bus-bar voltage
14-time flash Power module
Stop valve
(Closed valve)
15-time flash LEV for drain
LED indication
(Outdoor P.C. board) Condition
LED 1 LED 2
8 times Goes A short or open circuit is detected in
out
the current sensor
during compressor operating.
6 times Goes The bus-bar voltage exceeds 430 V
or falls to 50 V or below during
out
compressor operating.
7 times Goes
There is a high possibility that the
out
power module is out of order.
Lighting 12 times
Closed valve is detected by compressor
current.
(MXZ-2B30VA, MXZ-2B40VA)
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-543