Mitsubishi Electric MSZ-LN-VG Series Service Manual page 99

3. Table of outdoor unit failure mode recall function
MXZ-2F
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
Refrigerant leakage
(Sensor detection)
OBH790D
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 wind-
ing 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 Lit 1. Refrigerant leaks from the piping or the
heat exchanger in the indoor unit.
2. The following items are used around the
indoor unit.
• Spray (LP gas including Freon, and
whose main ingredient is propane and
butane)
• Aerosol insecticide (including ethanol)
• Air spray painting (including dichlo-
romethane)
• Charcoal (charcoal fire)
• Chemicals (such as ethanol)
99
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.
• Turn off the power after the in-
door unit finishes its FAN opera-
tion.
(The FAN operation continues for 3
hours.)
• Check the indoor unit to detect
the part where refrigerant leaks.
• Repair the part where refrigerant
leaks.
• Turn on the power again.
• Replace the refrigerant sensor if
the problem is not fixed.
Indoor/
outdoor
unit failure
Remedy
mode
recall
function
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"How to check
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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-
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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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