Mitsubishi Electric M Series Installation Manual page 106

MITSUBISHI ELECTRIC / DIAGNOSTIC
FAILURE MODE RECALL M SERIES
UPPER OR LEFT LAMP
OF OPERATION
INDICATOR LAMP (FAILURE MODE/PROTECTION)
(INDOOR UNIT)
OFF
2-time blink Outdoor power system
Discharge temperature thermistor
Ambient temperature thermistor
3-time blink
Fin temperature thermistor
P.C. board temperature thermistor
Outdoor heat exchanger temperature
4-time blink
5-time blink Discharge temperature
6-time blink
7-time blink
P.C. board temperature
8-time blink
Nonvolatile memory data
9-time blink
10-time blink Discharge temperature
11-time blink
14-time blink
Refrigerant leakage (Sensor detection)
104
- OUTDOOR UNIT - MULTISPLIT - 2 PORTS
LED INDICATION
(OUTDOOR P.C.
ABNORMAL POINT
LED 1
None (Normal) Not lit
Defrost thermistor
thermistor
Overcurrent Once
Twice
Compressor
9 times
High pressure
Fin temperature 3 times
4 times
Outdoor fan motor
Power module 7 times
Current sensor 8 times
Bus-bar voltage 6 times
Stop valve
CONDITION
BOARD)
LED 2
Not lit
-
Overcurrent protection cut-out
operates 3 consecutive times within
1 minute after the compressor gets
started.
Lit Lit
Compressor protection cut-out
operates 24 consecutive times
within 10 seconds after the
compressor gets started.
Lit Once
Lit Once
Lit Twice
Thermistor shorts or opens during
compressor running.
Lit 3 times
Lit 4 times
Lit 9 times
The overcurrent flows into intelligent
Not lit
power module.
The overcurrent flows into intelligent
power module within 10 seconds
Not lit
after the compressor gets started.
(The compressor gets restarted in
15 seconds.)
Waveform of compressor current is
Not lit
dis-torted.
Discharge temperature exceeds
Lit Lit
116ºC during operation.
The outdoor heat exchanger
temperature exceeds 70ºC during
Lit Lit
cooling or the indoor gas pipe
temperature exceeds
70ºC during heating.
The fin temperature exceeds 90ºC
Not lit
during operation.
The P.C. board temperature
Not lit
exceeds 80ºC during operation.
Failure occurs 3 consecutive times
Lit Lit
within 30 seconds after the fan gets
started.
Nonvolatile memory data cannot be
Lit 5 times
read properly.
The output of the power module that
drove the compressor was shorted
Not lit
or the wind-ing of the compressor
was shorted.
The discharge temperature is kept
under 50ºC (COOL mode)/40ºC
Lit Lit
(HEAT mode) for more than 40
minutes.
The sensor circuit of current of
Not lit
compressor shorts or opens during
compressor operate.
The bus-bar voltage exceeds 430
Not lit
V or falls to 50 V or below during
compres-sor operating.
The current of compressor is power
Lit 12 times
module is out of order.
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
Lit Lit
and butane)
• Aerosol insecticide (including
ethanol)
• Air spray painting (including dichlo-
romethane)
• Charcoal (charcoal fire)
• Chemicals (such as ethanol)
REMEDY UNIT FAILURE
MODE RECALL
-
• Check the compressor connecting
wire.
• Refer to 12-6. "How to check
inverter/compressor".
• Check the stop valve.
• Refer to 12-6. "Check of outdoor
thermistors".
• Replace the inverter P.C. board.
• Refer to 12-6. "Check of outdoor
thermistors".
• Check the compressor connecting
wire.
• Refer to 12-6. "How to check
inverter/compressor".
• Check the stop valve.
• Check the compressor connecting
wire.
• Refer to 12-6. "How to check
inverter/compressor".
• Check the refrigerant circuit and
the refrigerant amount.
• Refer to 12-6. "Check of LEV".
• Check the refrigerant circuit and
the refrigerant amount.
• Check the stop valve.
• Check the around outdoor unit.
• Check the outdoor unit air pas-
• Refer to 12-6. "Check of out-door
fan motor".
• Refer to 12-6. "Check of out-door
fan motor".
• Replace the inverter P.C. board.
• Refer to 12-6. "How to check
inverter/compressor".
• Check the refrigerant circuit and
the refrigerant amount.
• Refer to 12-6. "Check of LEV".
• 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
FUNCTION
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