Mitsubishi Electric M Series Manual page 165

M series
MUZ-FD50VA
MUZ-FD50VAH
Outdoor unit failure mode table
Power lamp Abnormal point
(Failure mode/protection)
(Indoor unit)
OFF None (Normal)
Outdoor power system
2-time flash
3-time flash Discharge temperature
thermistor
Defrost thermistor
Ambient temperature thermistor
Fin temperature thermistor
P.C. board temperature
thermistor
Outdoor heat exchanger
temperature thermistor
Over current
4-time flash
5-time flash Discharge temperature
High pressure
6-time flash
Fin temperature
7-time flash
P.C. board temperature
8-time flash
Outdoor fan motor
9-time flash Nonvolatile memory data
Discharge temperature
10-time flash
LED indication
Condition
(Outdoor P.C. board)
LED 1 LED 2
Lighting Lighting
Lighting Lighting Overcurrent protection stop is
continuously performed 3 times within
1 minute after the compressor gets
started, or when converter protection
stop or bus-bar voltage protection stop
is continuously performed 3 times
within 3 minutes after start-up.
Lighting Once Thermistor shorts or opens during
compressor running.
Lighting Once
Lighting Twice
Lighting 3 times
Lighting 4 times
Lighting 9 times
Once Goes
28A current flows into intelligent power
out
module.
Lighting Lighting Discharge temperature exceeds 116
during operation.
Compressor can restart if discharge
temperature thermistor reads 100
less 3 minutes later.
The outdoor heat exchanger
Lighting Lighting
temperature exceeds 70 during
cooling or the indoor gas pipe
temperature exceeds 70
heating.
3 times Goes
The fin temperature exceeds 87
out
during operation.
The P.C. board temperature exceeds
4 times Goes
out 70 during operation.
Lighting Lighting
Failure occurs continuously 3 times
within 30 seconds after the fan gets
started.
Lighting 5 times
Nonvolatile memory data cannot be
read properly.
Lighting Lighting
The frequency of the compressor is
kept 80Hz or more and the discharge
temperature is kept under 39
more than 20 minutes.
WALL-MOUNTED Inverter Heat Pump
Indoor/outdoor
unit failure mode
recall function
or
during
for
C-163