Mitsubishi Electric MXZ-2C30VA Service Manual page 86

3. Outdoor unit failure mode table
MXZ-2C
Upper or left lamp of
Abnormal point
OPERATION INDICATOR
(Failure mode / protection)
lamp (Indoor unit)
None (Normal)
OFF
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
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
NOTE: Blinking patterns of this mode differ from the ones of Troubleshooting check table (11-4).
OBH584G
LED indication
Condition
(Outdoor P.C. board)
LED 1 LED 2
Lighted Lighted
Lighted Lighted Overcurrent protection cut-out operates
3 consecutive times within 1 minute
after the compressor gets started.
Lighted Once Thermistor shorts or opens during
compressor running.
Lighted Once
Lighted Twice
Lighted 3 times
Lighted 4 times
Lighted 9 times
Once Not
14 A (MXZ-2C30VA)/18 A (MXZ-2C
lighted
40VA, MXZ-2C52VA) current flows into
intelligent power module.
The possibility of intercepting the
Twice
Not
overcurrent by the compressor lock is
lighted
high.
9 times Not The compressor doesn't synchronize
lighted with the operating power.
Discharge temperature exceeds 116°C
Lighted Lighted
during operation.
Compressor can restart if discharge
temperature thermistor reads 100°C or
less 3 minutes later.
Lighted Lighted
The outdoor heat exchanger
temperature exceeds 70°C during
cooling or the indoor gas pipe
temperature exceeds 70°C during
heating.
3 times Not
The fin temperature exceeds 90°C
lighted
during operation.
4 times Not The P.C. board temperature exceeds
78°C during operation.
lighted
Lighted Lighted
Failure occurs 3 consecutive times
within 30 seconds after the fan gets
started.
Lighted 5 times
Nonvolatile memory data cannot be
read properly.
The frequency of the compressor is
Lighted Lighted
kept 68 Hz (MXZ-2C30VA, MXZ-
2C40VA)/80Hz (MXZ-2C52VA) or
more and the discharge
temperature is kept under
50°C (COOL mode)/40°C (HEAT mode)
for more than 40 minutes.
86
Indoor/outdoor
Remedy
unit failure mode
recall function
• Check the connection
of the compressor
connecting wire.
• Refer to 11-6.
"How to check
inverter/compressor".
• Check the stop valve.
• Refer to 11-6. "Check
of outdoor thermistors".
• Replace the inverter
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 the connection of
the compressor
connecting wire.
• Refer to 11-6. "How to
check inverter/
compressor".
• Check the refrigerant
circuit and the refrigerant
amount.
• Refer to 11-6. "Check
of LEV".
• Check the refrigerant
circuit and the refrigerant
amount.
• Check the stop valve.
• Check around the
outdoor unit.
• Check the outdoor unit
air passage.
• Refer to 11-6. "Check
of outdoor fan motor".
• Refer to 11-6. "Check
of outdoor fan motor".
• Replace the inverter
P.C. board.
• Check the refrigerant
circuit and the refrigerant
amount.
• Refer to 11-6. "Check
of LEV".