Mitsubishi Electric MXZ-2HA40VF-E1 Service Manual page 43

3. Table of outdoor unit failure mode recall function
MXZ-2HA
Upper or
left lamp of
OPERATION Abnormal point
INDICATOR (Failure mode/protection)
lamp (Indoor
unit)
OFF None (Normal)
2-time blink Outdoor power system
3-time blink Discharge temperature
thermistor
Defrost thermistor
Ambient temperature
thermistor
Fin temperature thermistor
P.C. board temperature
thermistor
Outdoor heat exchanger
temperature thermistor
4-time blink Overcurrent
Compressor
5-time blink Discharge temperature
6-time blink High pressure
7-time blink Fin temperature
P.C. board temperature
8-time blink Outdoor fan motor
9-time blink Nonvolatile memory data
Power module
10-time blink Discharge temperature
11-time blink Current sensor
Bus-bar voltage
14-time blink Stop valve
17 time blink Outdoor refrigerant system
abnormality
OBH828B
LED indication
(Outdoor P.C. board)
LED 1 LED 2
Not lit Not lit —
Lit Lit 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.
Lit Once Thermistor shorts or opens during
compressor running.
Lit Once
Lit Twice
Lit 3 times
Lit 4 times
Lit 9 times
Once Not lit The overcurrent flows into intelligent
power module.
Twice Not lit The overcurrent flows into intelligent
power module within 10 seconds after
the compressor gets started.
( The compressor gets restarted in
15 seconds.)
9 times Not lit Waveform of compressor current is dis-
torted.
Lit Lit Discharge temperature exceeds 116ºC
during operation.
Lit Lit The outdoor heat exchanger temperature
exceeds 70ºC during cooling or the indoor
gas pipe temperature exceeds
70ºC during heating.
3 times Not lit The fin temperature exceeds 90ºC
during operation.
4 times Not lit The P.C. board temperature exceeds
80ºC during operation.
Lit Lit Failure occurs 3 consecutive times
within 30 seconds after the fan gets
started.
Lit 5 times Nonvolatile memory data cannot be read
properly.
7 times Not lit The output of the power module that
drove the compressor was shorted or
the winding of the compressor was
shorted.
Lit Lit The discharge temperature is kept
under 50ºC (COOL mode)/40ºC (HEAT
mode) for more than 40 minutes.
8 times Not lit The sensor circuit of current of
compressor shorts or opens during
compressor operate.
6 times Not lit The bus-bar voltage exceeds 430 V or
falls to 50 V or below during compres-
sor operating.
Lit 12 times The current of compressor is power
module is out of order.
Lit 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.
43
NOTE: Blinking patterns of this mode differ from the ones of
Troubleshooting check table (12-4).
Condition
—
• Check the compressor connecting
wire.
• Refer to 12-6.
inverter/compressor".
• Check the stop valve.
• Refer to 12-6.
door thermistors".
• Replace the inverter P.C. board.
• Refer to 12-6.
door thermistors".
• Check the compressor connecting
wire.
• Refer to 12-6.
inverter/compressor".
• Check the stop valve.
• Check the compressor connecting
wire.
• Refer to 12-6.
inverter/compressor".
• Check the refrigerant circuit and
the refrigerant amount.
• Refer to 12-6.
• 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 12-6.
door fan motor".
• Refer to 12-6.
door fan motor".
• Replace the inverter P.C. board.
• Refer to 12-6.
inverter/compressor".
• Check the refrigerant circuit and
the refrigerant amount.
• Refer to 12-6.
• 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 12-6.
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-
"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-