Mitsubishi Electric MUZ-GA50VA-E1, Service Manual

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3. Outdoor failure mode table
OFF None (Normal)
2-time flash
3-time flash
4-time flash
5-time flash
6-time flash
7-time flash
8-time flash
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
• Check the connection
of the compressor
connecting wire.
• Refer to 11-4.
"How to check
inverter/compressor".
• Check the stop valve.
• Replace the outdoor
electronic control
P.C. board.
•Check refrigerant circuit
and refrigerant amount.
• Refer to 11-6. "Check
of LEV".
• Refer to 11-6. "Check
of outdoor fan motor".
• Replace the outdoor
electronic control
P.C. board.
•Check refrigerant circuit
and refrigerant amount.
• Refer to 11-6. "Check
of LEV".
• Reconnect compressor
connector.
• Refer to 11-6. "How to
check inverter/
compressor."
• Check the stop valve.
•Check refrigerant circuit
and refrigerant amount.
• Check the stop valve.
• Check around outdoor
unit.
• Check outdoot unit air
passage.
• Refer to 11-6. "Check
of outdoor fan motor".
• Refer to 11-6. "Check
of outdoor thermistors".
• Refer to 11-6. "Check
of outdoor thermistors".
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.
Thermistor shorts or opens during
compressor running.
28A current flows into intelligent power
module.
High-pressure is detected with the
high-pressure switch (HPS) during
operation.
The outdoor heat exchanger
temperature exceeds 70°Cduring
cooling or the indoor gas pipe
temperature exceeds 70°C during
heating.
The fin temperature exceeds 87°C
during operation.
The P.C. board temperature exceeds
70°C during operation.
Failure occurs continuously 3 times
within 30 seconds after the fan gets
started.
Nonvolatile memory data cannot be
read properly.
The frequency of the compressor is
kept 80Hz or more and the discharge
temperature is kept under 39°C for
more than 20 minutes.
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
- -
Abnormal point
(Failure mode/protection)
Condition Remedy
Indoor/outdoor
unit failure mode
recall function
LED indication
(Outdoor P.C. board)
LED 1 LED 2
Discharge temperature exceeds 116 °C
during operation.
Compressor can restart if discharge
temperature thermistor reads 100°C or
less 3 minutes later.
The left lamp of
OPERATION INDICAOR
lamp(Indoor unit)