Mitsubishi Electric M-SERIES, Manual

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M series MULTI SYSTEM Inverter Heat Pump
MUL
TI
SYSTEMS
TROUBLESHOOTING
C-542
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)
OFF
2-time flash
3-time flash
4-time flash
5-time flash
6-time flash
7-time flash
8-time flash
Lighting Lighting
Lighting Lighting
Lighting Once
Lighting Once
Lighting Twice
Lighting 3 times
Lighting 4 times
Lighting 9 times
Once Goes out
Lighting Lighting
Lighting Lighting
3 times Goes
out
4 times Goes
out
Lighting Lighting
Lighting Lighting
Lighting 5 times
9-time flash
10-time flash
Overcurrent protection stop is
continuously performed three times
within 1 minute after the compressor
gets started.
Thermistor shorts or opens during
compressor running.
14 A ( MXZ-2B30VA )/18 A ( MXZ-2B40VA ,
MXZ-2B52VA ) current flows into
intelligent power module.
Discharge temperature exceeds 116°C
during operation.
Compressor can restart if discharge
temperature thermistor reads 100°C or
less 3 minutes later.
The outdoor heat exchanger
temperature exceeds 70°C during
cooling or the indoor gas pipe
temperature exceeds 70°C during
heating.
The fin temperature exceeds 90°C
during operation.
The P.C. board temperature exceeds
78°C during operation.
Failure occurs continuously three
times within 30 seconds after
the fan gets started.
Nonvolatile memory data cannot be
read properly.
Outdoor power system
Discharge temperature
thermistor
Defrost thermistor
Ambient temperature thermistor
Fin temperature thermistor
P.C. board temperature
thermistor
Outdoor heat exchanger
temperature thermistor
Overcurrent
Discharge temperature
High pressure
Fin temperature
P.C. board temperature
Outdoor fan motor
Nonvolatile memory data
Discharge temperature
None (Normal)
Compressor
Twice
9 times
Goes
out
Goes
out
The possibility of intercepting the
overcurrent by the compressor lock is
high.
The compressor does not synchronize
with the operating power.
The frequency of the compressor is
kept 68 Hz ( MXZ-2B30VA , MXZ-
2B40VA )/ 80Hz ( MXZ-2B52VA ) or
more and the discharge temperature is
kept under 50°C (COOL mode)/40°C
(HEAT mode) for more than 40 minutes.
2. Outdoor unit failure mode table
MXZ-2B