Mitsubishi Electric MXZ-2C30VA Service Manual page 86

MXZ-6C
Upper or
left lamp of
OPERATION Abnormal point
INDICATOR (Failure mode/protection)
lamp (Indoor
unit)
OFF None (Normal)
2-time f ash Outdoor power system
3-time f 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 f ash Overcurrent
Out-of-step protection
5-time f ash Discharge temperature
6-time f ash High pressure
7-time f ash Fin temperature
P.C. board temperature
8-time f ash Outdoor fan motor
9-time f ash Nonvolatile memory data
10-time f ash Discharge temperature
OBH584E
LED indication
(Outdoor P.C. board)
LED 1 LED 2
Lighted Lighted
Lighted Lighted 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.
Lighted Once Thermistor shorts or opens during
compressor running.
Lighted Once
Lighted Twice
Lighted 3 times
Lighted 4 times
Lighted 9 times
Once Not 40 A current f ows into intelligent power
lighted module.
9 times Not Waveform of compressor current is dis-
lighted torted.
Lighted Lighted Discharge temperature exceeds 114 °C
during operation.
Compressor can restart if discharge
temperature thermistor reads 100 °C or
less 3 minutes later.
Lighted Lighted 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 Not The fin temperature exceeds
lighted (MXZ-6C120VC-
6C120VC-
E2
ing operation.
4 times Not The P.C. board temperature exceeds
lighted 95 °C during operation.
Lighted Lighted 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.
Lighted 5 times Nonvolatile memory data cannot be
read properly.
Lighted Lighted The frequency of the compressor is
kept 58Hz or more and the discharge
temperature is kept under 50 °C (cool-
ing)/40 °C (heating) for more than 40
minutes.
86
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
(MXZ-6C120VA)/outdoor pow-
er P.C. board (MXZ-6C122VA).
• Replace the power board
(MXZ-6C120VA)/outdoor pow-
er P.C. board (MXZ-6C122VA).
• 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.
:
110 °C
) / 105°C (MXZ-
E1 • Check around outdoor unit.
, MXZ-6C122VC- ) dur- • Check outdoor unit air pas-
E1
sage.
• Refer to 11-6.
outdoor fan motor".
• Refer to 11-6.
outdoor fan motor".
• Replace the control P.C. board
( M X Z - 6 C 1 2 0 VA ) / o u t d o o r
c o n t r o l P. C . b o a r d ( M X Z -
6C122VA).
• Replace the power board
(MXZ-6C120VA)/outdoor pow-
er P.C. board (MXZ-6C122VA).
• Check refrigerant circuit and
refrigerant amount.
• Refer to 11-6.
LEV".
Indoor/
outdoor
unit failure
Remedy
mode
recall
function
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