Mitsubishi Electric MXZ-2D33VA Service Manual page 126

3. Outdoor unit failure mode table
MXZ-2D
Upper or
left lamp of
OPERATION Abnormal point
INDICATOR (Failure mode/protection)
lamp (Indoor
unit)
OFF None (Normal)
2-time fl ash Outdoor power system
3-time fl ash Discharge temperature
thermistor
Defrost thermistor
Ambient temperature
thermistor
Fin temperature thermistor
P.C. board temperature
thermistor
Outdoor heat exchanger
temperature thermistor
4-time fl ash Overcurrent
Compressor
5-time fl ash Discharge temperature
6-time fl ash High pressure
7-time fl ash Fin temperature
P.C. board temperature
8-time fl ash Outdoor fan motor
9-time fl ash Nonvolatile memory data
Power module
10-time fl ash Discharge temperature
11-time fl ash Current sensor
Bus-bar voltage
14-time fl ash Stop valve
17 time fl ash Outdoor refrigerant system
abnormality
NOTE: Blinking patterns of this mode differ from the ones of Troubleshooting check table (11-4).
OBH626K
LED indication
(Outdoor P.C. board)
LED 1 LED 2
Not lighted Not lighted —
Lighted Lighted Overcurrent protection cut-out operates
3 consecutive times within 1 minute after
the compressor gets started.
Compressor protection cut-out
operates 24 consecutive times within
10 seconds 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 The overcurrent fl ows into intelligent
lighted power module.
Twice Not The overcurrent fl ows into intelligent
lighted power module within 10 seconds after
the compressor gets started.
( The compressor gets restarted in
15 seconds.)
9 times Not Waveform of compressor current is dis-
lighted torted.
Lighted Lighted Discharge temperature exceeds 116ºC
during operation.
Lighted Lighted The outdoor heat exchanger temperature
exceeds 70ºC during cooling or the indoor
gas pipe temperature exceeds
70ºC during heating.
3 times Not The fi n temperature exceeds 90ºC
lighted during operation.
4 times Not The P.C. board temperature exceeds
lighted 80ºC during operation.
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.
7 times Not The output of the power module that
lighted drove the compressor was shorted or
the winding of the compressor was
shorted.
Lighted Lighted The discharge temperature is kept
under 50ºC (COOL mode)/40ºC (HEAT
mode) for more than 40 minutes.
8 times Not The sensor circuit of current of
lighted compressor shorts or opens during
compressor operate.
6 times Not The bus-bar voltage exceeds 430 V or
lighted falls to 50 V or below during compres-
sor operating.
Lighted 12 times The current of compressor is power
module is out of order.
Lighted 17 times A closed valve and air trapped in the
refrigerant circuit are detected based on
the temperature sensed by the indoor and
outdoor thermistors and the current of the
compressor.
126
Condition
—
• Check the compressor connecting
wire.
• Refer to 11-6.
inverter/compressor".
• Check the stop valve.
• Refer to 11-6.
door thermistors".
• Replace the inverter P.C. board.
• Refer to 11-6.
door thermistors".
• Check the compressor connecting
wire.
• Refer to 11-6.
inverter/compressor".
• Check the stop valve.
• Check the compressor connecting
wire.
• Refer to 11-6.
inverter/compressor".
• Check the refrigerant circuit and
the refrigerant amount.
• Refer to 11-6.
• Check the refrigerant circuit and
the refrigerant amount.
• Check the stop valve.
• Check the around outdoor unit.
• Check the outdoor unit air pas-
sage.
• Refer to 11-6.
door fan motor".
• Refer to 11-6.
door fan motor".
• Replace the inverter P.C. board.
• Refer to 11-6.
inverter/compressor".
• Check the refrigerant circuit and
the refrigerant amount.
• Refer to 11-6.
• Replace the inverter P.C. board.
• Check the power supply.
• Replace the inverter P.C. board.
• Check the stop valve.
• Check the refrigerant circuit and
the refrigerant amount.
• Check for a gas leak in a connecting
piping etc.
• Check the stop valve.
• Refer to 11-6.
door refrigerant circuit".
Indoor/
outdoor
unit failure
Remedy
mode
recall
function
—
"How to check
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"Check of out- ○
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"Check of out-
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"How to check —
"How to check —
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"Check of LEV".
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"Check of out-
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"Check of out-
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"How to check
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—
"Check of LEV".
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"Check of out-