Mitsubishi Electric MUZ-GA50VA-E1 Service Manual page 30

3. Outdoor failure mode table
The left lamp of
Abnormal point
OPERATION INDICAOR
(Failure mode/protection)
lamp(Indoor unit)
OFF None (Normal)
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
4-time flash Overcurrent
5-time flash Discharge temperature
6-time flash High pressure
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
(Outdoor P.C. board) Condition
LED 1 LED 2
- -
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.
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
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.
3 times
Goes
The fin temperature exceeds 87°C
out
during operation.
4 times Goes The P.C. board temperature exceeds
70°C during operation.
out
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°C for
more than 20 minutes.
30
Indoor/outdoor
Remedy
unit failure mode
recall function
• Check the connection
of the compressor
connecting wire.
• Refer to 11-4.
"How to check
inverter/compressor".
• Check the stop valve.
• Refer to 11-6. "Check
of outdoor thermistors".
• Replace the outdoor
electronic control
P.C. board.
• Refer to 11-6. "Check
of outdoor thermistors".
• Reconnect compressor
connector.
• Refer to 11-6. "How to
check inverter/
compressor."
• Check the stop valve.
•Check refrigerant circuit
and refrigerant amount.
• Refer to 11-6. "Check
of LEV".
•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 fan motor".
• Replace the outdoor
electronic control
P.C. board.
•Check refrigerant circuit
and refrigerant amount.
• Refer to 11-6. "Check
of LEV".