Mitsubishi Electric MXZ-2C30VA, Service Manual

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3. Outdoor unit failure mode table
Abnormal point
(Failure mode / protection)
Condition Remedy
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
Lighted Lighted
Lighted Lighted
Lighted Once
Lighted Once
Lighted Twice
Lighted 3 times
Lighted 4 times
Lighted 9 times
Once
Lighted Lighted
Lighted Lighted
3 times Not
lighted
4 times Not
lighted
Lighted Lighted
Lighted Lighted
Lighted 5 times
9-time flash
10-time flash
• Check the connection
of the compressor
connecting wire.
• Refer to 11-6.
"How to check
inverter/compressor".
• Check the stop valve.
• Replace the inverter
P.C. board.
• Check the refrigerant
circuit and the refrigerant
amount.
• Refer to 11-6.
"Check
of LEV".
• 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".
• Reconnect compressor
connector.
• Refer to 11-6.
"How
to check inverter/
compressor".
• Check the stop valve.
• 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 thermistors".
• Refer to 11-6. "Check
of outdoor thermistors".
Overcurrent protection cut-out operates
3 consecutive times within 1 minute
after the compressor gets started.
Thermistor shorts or opens during
compressor running.
14 A
(MXZ-2C30VA)
/18 A
(MXZ-2C
40VA, MXZ-2C52VA)
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 3 consecutive 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
Not
lighted
Not
lighted
The possibility of intercepting the
overcurrent by the compressor lock is
high.
The compressor doesn't synchronize
with the operating power.
• Check the connection of
the compressor
connecting wire.
• Refer to 11-6.
"How to
check inverter/
compressor".
The frequency of the compressor is
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.
Not
lighted
NOTE
: Blinking patterns of this mode differ from the ones of Troubleshooting check table (11-4).
MXZ-2C
OBH584G