Mitsubishi Electric M Series Manual page 544

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MULTI SYSTEM Inverter Heat Pump
2. Outdoor unit failure mode table
MXZ-2B
Upper or left lamp of
Abnormal point
OPERATION INDICATOR
(Failure mode/protection)
lamp (Indoor unit)
None (Normal)
OFF
2-time flash
Outdoor power system
3-time flash
Discharge temperature
thermistor
Defrost thermistor
Ambient temperature thermistor
Fin temperature thermistor
P.C. board temperature
thermistor
Outdoor heat exchanger
temperature thermistor
Overcurrent
4-time flash
Compressor
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
C-542
LED indication
(Outdoor P.C. board)
Condition
LED 1
LED 2
Lighting Lighting
Lighting Lighting
Overcurrent protection stop is
continuously performed three times
within 1 minute after the compressor
gets started.
Lighting Once
Thermistor shorts or opens during
compressor running.
Lighting Once
Lighting Twice
Lighting 3 times
Lighting 4 times
Lighting 9 times
Once Goes out
14 A (MXZ-2B30VA)/18 A (MXZ-2B40VA,
MXZ-2B52VA) current flows into
intelligent power module.
The possibility of intercepting the
Twice
Goes
overcurrent by the compressor lock is
out
high.
9 times
Goes
The compressor does not synchronize
out
with the operating power.
Discharge temperature exceeds 116°C
Lighting Lighting
during operation.
Compressor can restart if discharge
temperature thermistor reads 100°C or
less 3 minutes later.
Lighting Lighting
The outdoor heat exchanger
temperature exceeds 70°C during
cooling or the indoor gas pipe
temperature exceeds 70°C during
heating.
3 times
Goes
The fin temperature exceeds 90°C
out
during operation.
4 times
Goes
The P.C. board temperature exceeds
out
78°C during operation.
Lighting Lighting
Failure occurs continuously three
times within 30 seconds after
the fan gets started.
Lighting 5 times
Nonvolatile memory data cannot be
read properly.
The frequency of the compressor is
Lighting Lighting
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.
M series
Indoor/outdoor
unit failure mode
recall function

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