Mitsubishi Electric MXZ-2D33VA-E1 Service Manual page 69

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 f ash Outdoor power system
3-time f ash Discharge temperature
thermistor
Defrost thermistor
Ambient temperature
thermistor
Fin temperature thermistor
P.C. board temperature
thermistor
Outdoor heat exchanger
temperature thermistor
4-time f ash Overcurrent
Compressor
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
Power module
10-time f ash Discharge temperature
11-time f ash Current sensor
Bus-bar voltage
14-time f ash Stop valve
NOTE: Blinking patterns of this mode differ from the ones of Troubleshooting check table (11-4).
OBH626B
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 f ows into intelligent
lighted power module.
Twice Not The overcurrent f 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 116 ºC
during operation.
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.
3 times Not The f n temperature exceeds 90 ºC
lighted during operation.
4 times Not The P.C. board temperature exceeds
lighted 80 ºC 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 50 ºC (COOL mode)/40 ºC (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.
69
Condition
—
• Check the compressor con-
necting wire.
• Refer to 11-6.
inverter/compressor".
• Check the stop valve.
• Refer to 11-6.
outdoor thermistors".
• Replace the inverter P.C.
board.
• Refer to 11-6.
outdoor thermistors".
• Check the compressor con-
necting wire.
• Refer to 11-6.
inverter/compressor".
• Check the stop valve.
• Check the compressor con-
necting wire.
• Refer to 11-6.
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 inverter P.C.
board.
• Refer to 11-6.
inverter/compressor".
• Check refrigerant circuit and
refrigerant amount.
• Refer to 11-6.
LEV".
• Replace the inverter P.C.
board.
• Check the power supply.
• Replace the inverter P.C.
board.
• Check the stop valve.
• Check refrigerant circuit and
refrigerant amount.
Indoor/
outdoor
unit failure
Remedy
mode
recall
function
—
"Check of
○
"Check of
○
○
○
○
○
"Check of
○
"Check of —
"Check of —
—
—
"Check of
—
—
"Check of
—
"Check of
—
○
"Check of
○
—
"Check of
○
○
○