Mitsubishi Electric MXZ-2D33VA-E1, Service Manual

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69
3. Outdoor unit failure mode table
MXZ-2D
Upper or
left lamp of
OPERATION
INDICATOR
lamp (Indoor
unit)
Abnormal point
(Failure mode/protection)
LED indication
(Outdoor P.C. board)
Condition Remedy
Indoor/
outdoor
unit failure
mode
recall
function
LED 1 LED 2
OFF None (Normal) Not lighted Not lighted — — —
2-time f ash Outdoor power system 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.
• Check the compressor con-
necting wire.
• Refer to 11-6. "Check of
inverter/compressor".
• Check the stop valve.
○
3-time f ash Discharge temperature
thermistor
Lighted Once Thermistor shorts or opens during
compressor running.
• Refer to 11-6. "Check of
outdoor thermistors".
○
Defrost thermistor Lighted Once
○
Ambient temperature
thermistor
Lighted Twice
○
Fin temperature thermistor Lighted 3 times ○
P.C. board temperature
thermistor
Lighted 4 times • Replace the inverter P.C.
board.
○
Outdoor heat exchanger
temperature thermistor
Lighted 9 times • Refer to 11-6. "Check of
outdoor thermistors".
○
4-time f ash Overcurrent Once Not
lighted
The overcurrent f ows into intelligent
power module.
• Check the compressor con-
necting wire.
• Refer to 11-6. "Check of
inverter/compressor".
• Check the stop valve.
—
Compressor Twice Not
lighted
The overcurrent f ows into intelligent
power module within 10 seconds after
the compressor gets started.
( The compressor gets restarted in
15 seconds.)
• Check the compressor con-
necting wire.
• Refer to 11-6. "Check of
inverter/compressor".
—
9 times Not
lighted
Waveform of compressor current is dis-
torted.
—
5-time f ash Discharge temperature Lighted Lighted Discharge temperature exceeds 116 ºC
during operation.
• Check refrigerant circuit and
refrigerant amount.
• Refer to 11-6. "Check of
LEV".
—
6-time f ash High pressure Lighted Lighted The outdoor heat exchanger tempera-
ture exceeds 70 ºC during cooling or
the indoor gas pipe temperature ex-
ceeds 70 ºC during heating.
• Check refrigerant circuit and
refrigerant amount.
• Check the stop valve.
—
7-time f ash Fin temperature 3 times Not
lighted
The f n temperature exceeds 90 ºC
during operation.
• Check around outdoor unit.
• Check outdoor unit air pas-
sage.
—
P.C. board temperature 4 times Not
lighted
The P.C. board temperature exceeds
80 ºC during operation.
• Refer to 11-6. "Check of
outdoor fan motor".
—
8-time f ash Outdoor fan motor Lighted Lighted Failure occurs 3 consecutive times
within 30 seconds after the fan gets
started.
• Refer to 11-6. "Check of
outdoor fan motor".
—
9-time f ash Nonvolatile memory data Lighted 5 times Nonvolatile memory data cannot be
read properly.
• Replace the inverter P.C.
board.
○
Power module 7 times Not
lighted
The output of the power module that
drove the compressor was shorted or
the winding of the compressor was
shorted.
• Refer to 11-6. "Check of
inverter/compressor". ○
10-time f ash Discharge temperature Lighted Lighted The discharge temperature is kept
under 50 ºC (COOL mode)/40 ºC (HEAT
mode) for more than 40 minutes.
• Check refrigerant circuit and
refrigerant amount.
• Refer to 11-6. "Check of
LEV".
—
11-time f ash Current sensor 8 times Not
lighted
The sensor circuit of current of
compressor shorts or opens during
compressor operate.
• Replace the inverter P.C.
board.
○
Bus-bar voltage 6 times Not
lighted
The bus-bar voltage exceeds 430 V or
falls to 50 V or below during compres-
sor operating.
• Check the power supply.
• Replace the inverter P.C.
board.
○
14-time f ash Stop valve Lighted 12 times The current of compressor is power
module is out of order.
• Check the stop valve.
• Check refrigerant circuit and
refrigerant amount.
○
NOTE: Blinking patterns of this mode differ from the ones of Troubleshooting check table (11-4).
OBH626B