Service manual

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3. Failure mode table
LED1 LED2
OFF Normal
2-time flash Outdoor power system Outdoor power system Lighting Lighting When IPM protection stop or lock
protection stop is continuously
performed three times within 1
minute after the compressor gets
started, or when converter
protection stop or bus-bar voltage
protection stop is continuously
performed three times within 3
minutes after start-up.
• Check the connection of the
compressor connecting wire.
• Check the inverter/compressor.
(Refer to 10-6.E.)
• Check the stop valve.
• Check the PAM module.
3-time flash Outdoor thermistors Discharge temperature
thermistor
Lighting Once When a short circuit is detected in
the thermistor during operation, or
when an open circuit is detected in
the thermistor after 10 minutes of
compressor start-up.
Defrost thermistor Lighting Once When a short circuit is detected
during compressor operating, or
when an open circuit is detected
after 5 minutes of compressor
start-up.
Ambient temperature thermistor
Lighting
Twice
Fin temperature thermistor
Lighting
3 times
P.C. board temperature
thermistor
Lighting 4 times • Replace the outdoor electronic
control P.C. board.
Outdoor heat
exchanger temperature thermistor
Lighting 9 times When a short circuit is detected in
the thermistor during operation, or
when an open circuit is detected in
the thermistor after 5 minutes (in
cooling) and 10 minutes (in heating)
of compressor start-up.
4-time flash Overcurrent protection IPM protection Once Goes
out
When overcurrent is detected after
30 seconds of compressor start-up.
Lock protection Once
Goes
out
When overcurrent is detected
within 30 seconds after the
compressor gets started.
5-time flash Refrigerant system
protection
Discharge temperature
protection
Lighting Lighting When discharge temperature
exceeds 116: during operation.
• Check the amount of gas and
refrigerant circuit.
• Check the LEV. (Refer to 10-6.D.)
6-time flash High-pressure protection HPS protection Lighting Lighting When high-pressure is detected
with the high-pressure switch
(HPS) during operation.
High-pressure protection Lighting Lighting When the outdoor heat exchanger
temperature exceeds 70:
during cooling or the indoor gas
pipe temperature exceeds 70:
during heating.
7-time flash Fin temperature/P.C.
board temperature
overheat protection
Fin temperature protection 3 times
Goes
out
When the fin temperature exceeds
87: during operation.
P.C. board temperature
protection
4 times Goes
out
When the P.C. board temperature
exceeds 70: during operation.
8-time flash Fan protection Fan protection Lighting Lighting When failure occurs continuously
three times within 30 seconds after
the fan gets started.
• Check the outdoor fan motor.
(Refer to 10-6.G.)
9-time flash Outdoor control system EEPROM Lighting 5 times When the nonvolatile memory data
cannot be read properly.
• Replace the outdoor electronic
control P.C. board.
10-time flash
Low discharge
temperature
protection
Low discharge temperature
protection
Lighting Lighting When the frequency of the
compressor is kept 80Hz or
more and the discharge
temperature is kept under 39:
for more than 20 minutes.
• Check the amount of gas and
refrigerant circuit.
• Check the LEV. (Refer to 10-6.D.)
• Check the connection of the
compressor connecting wire.
• Check the inverter/ compressor.
(Refer to 10-6.E.)
• Check the stop valve.
• Check the amount of gas and the
refrigerant circuit.
• Check the stop valve.
• Check the surrounding of the
outdoor unit.
• Check the air passage.
• Check the outdoor fan motor.
(Refer to 10-6.G.)
Indoor operation
indicator lamp
Abnormal point
(Failure mode)
Details of abnormal point
• Check the outdoor thermistors.
(Refer to 10-6.F.)
• Check the outdoor thermistors.
(Refer to 10-6.F.)
When a short or open circuit is
detected in the thermistor during
operation.
Detecting method Check point
Indoor/outdoor
failure mode
recall function
Outdoor LED indication
-
-
-
-
-
With outdoor failure mode recall function, you can check the following failures.
With indoor/outdoor failure mode recall function, however, you can check the failures marked with " " only.
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