Mitsubishi Electric MXZ-2C30VA Service Manual page 75

MXZ-6C
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 thermis-
tor
Defrost thermistor
Ambient temperature thermistor
Fin temperature thermistor
P.C. board temperature thermis-
tor
Outdoor heat exchanger tem-
perature thermistor
4-time fl ash Overcurrent
Out-of-step protection
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
10-time fl ash Discharge temperature
LED indication
(Outdoor P.C. board)
LED 1 LED 2
Lighting Lighting
Lighting Lighting Overcurrent protection cut-out operates
3 consecutive times, bus-bar voltage
protection cut-out operates 3 consecu-
tive times, or primary current protection
cut-out operates 3 consecutive times
within 1minute after the compressor
gets started.
Lighting Once Thermistor shorts or opens during
compressor running.
Lighting Once
Lighting Twice
Lighting 3 times
Lighting 4 times
Lighting 9 times
Once Goes out 40 A current fl ows into intelligent power
module.
9 times Goes out Waveform of compressor current is dis-
torted.
Lighting Lighting Discharge temperature exceeds 114 °C
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 op-
eration.
The outdoor heat exchanger tempera-
ture exceeds 70 °C during cooling or
the indoor gas pipe temperature ex-
ceeds 70°C during heating.
3 times Goes out The fin temperature exceeds 110 °C
during operation.
4 times Goes out The P.C. board temperature exceeds
95 °C during operation.
Lighting Lighting The fan motor speed is 50 rpm or less
or 1500 rpm or more for 1 minute, or
the fan motor speed is 100 rpm or
less for 15 seconds when the outside
temperature is 20 °C or more.
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 50 °C (cool-
ing)/40 °C (heating) for more than 40
minutes.
75
Condition
• Check the connection of
the compressor connecting
wire.
• Refer to 11-6.
check inverter/compressor.
• Check the stop valve.
• Refer to 11-6.
outdoor thermistors".
• Replace the power board.
• Replace the power board.
• Refer to 11-6.
outdoor thermistors".
• Reconnect compressor con-
nector.
• Refer to 11-6.
check inverter/compressor".
• Check the stop valve.
• Refer to 11-6.
check inverter/compressor.
• Check refrigerant circuit and
refrigerant amount.
• Refer to 11-6.
LEV".
• Check refrigerant circuit and
refrigerant amount.
• Check the stop valve.
• Check around outdoor unit.
• Check outdoor unit air pas-
sage.
• Refer to 11-6.
outdoor fan motor".
• Refer to 11-6.
outdoor fan motor".
• Replace the outdoor control
P.C. board.
• Replace the power board.
• Check refrigerant circuit and
refrigerant amount.
• Refer to 11-6.
LEV".
Indoor/
outdoor
unit failure
Remedy
mode
recall
function
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