Service manual

31
10-4. Troubleshooting check table
LED1(Red) LED2(Yellow)
Lightning Twice Outdoor power system
• Check the connection of the compressor connecting
wire.
• Check the inverter/compressor. (Refer to 10-6.E.)
• Check the stop valve.
• Check the power module (PAM module).
Lightning 3 times
Discharge temperature
thermistor
• Check the discharge temperature thermistor.
(Refer to 10-6.F.)
• Check the ambient temperature thermistor.
( Refer to 10-6.F. )
Outdoor heat exchanger
temperature thermistor
• Check the outdoor hear exchanger temperature
thermistor.
( Refer to 10-6.F. )
Defrost thermistor
• Check the defrost thermistor.
( Refer to 10-6.F. )
Lightning 7 times EEPROM • Replace the outdoor electronic control P.C. board.
Lightning 8 times Current sensor • Replace the power board.
Lightning 11 times
Communication error
between P.C. boards
• Check the connecting wire between outdoor electronic control
P.C. board and power board.
Lightning 12 times
Zero cross detecting
circuit
• Check the connecting wire among outdoor electronic control
P.C. board, noise filter P.C. board and power board.
Abnormal point Check points
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.
When a short circuit is detected in the thermistor during operation, or
when an open circuit is detected in the thermistor after 5 minutes of
compressor start-up.
•
Check the fin temperature thermistor.( Refer to 10-6.F. )
• Replace the outdoor electronic control P.C. board.
Indication
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.
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.
Symptom: Outdoor unit does not operate.
Detecting method
When the nonvolatile memory data cannot be read properly.
Fin temperature
thermistor
P.C board temperature
thermistor
Lightning 4 times
Ambient temperature
thermistor
Current sensor protection stop is continuously performed twice.
When the communication protection stop between boards is
continuously performed twice.
The protection stop of the zero cross detecting circuit is continuously
performed 10 times.
When a short or open circuit is detected in the thermistor during
operation.
When a short or open circuit is detected in the thermistor during
operation.
5 timesLightning
Outdoor electronic control P.C. board(Parts side)
Lighting
NOTE 1. The location of LED is illustrated at the right figure.
2. LED lights up during normal operation.
LED1 LED2
IPM protection
Lock protection
3 times Goes out
Discharge temperature
protection
• Check the amount of gas and refrigerant circuit.
• Check the LEV.
( Refer to 10-6.D. )
Fin temperature
protection
P.C. board temperature
protection
HPS protection
High-pressure
protection
8 times Goes out
Converter protection
• Replace the power board.
Bus-bar voltage
protection (1)
• Replace the power board.
Bus-bar voltage
protection (2)
• Replace the power board.
13 times Goes out Fan protection • Check the outdoor fan motor.
( Refer to 10-6.G. )
Lighting 8 times
Current sensor
protection
• Replace the power board.
Lighting 11 times
Communication between P.C.
boards protection
• Check the connecting wire between outdoor electronic control
P.C. board and power board.
Lighting 12 times
Zero cross detecting circuit
protection
• Check the connecting wire among outdoor electronic control
P.C. board, noise filter P.C. board and power board.
• Check the surrounding of the outdoor unit.
• Check the air passage.
• Check the outdoor fan motor.
( Refer to 10-6.G. )
• Check the amount of gas and the refrigerant circuit.
• Check the stop valve.
• Check the connection of the compressor connecting
wire.
• Check the inverter/compressor.
( Refer to 10-6.E. )
• Check the stop valve.
• Check the power module.
Twice
Symptom: It is repeated that outdoor unit stops and restarts 3 minutes later.
Indication
Abnormal point Check pointsDetecting method
Goes out
4 times Goes out
5 times Goes out
9 times Goes out
When over-current is detected after 30 minutes of compressor start-up.
When over-current is detected within 30 minutes of compressor
start-up
When the bus-bar voltage exceeds 400V or falls to 200V or below
during compressor operating.
When the bus-bar voltage exceeds 400V or falls to 50V or below
during compressor operating.
When the discharge temperature exceeds 116: during operation.
When the fin temperature exceeds 87: during operation.
When the P.C. board temperature exceeds 70: during operation.
When high-pressure is detected with the high-pressure switch (HPS)
during operation.
When failure occurs continuously three times within 30 seconds after
the fan gets started.
When a short or open circuit is detected in the current sensor during
compressor operating.
Communication error occurs between the outdoor electronic control P.C.
board and power board for more than 10 seconds.
When zero cross signal cannot be detected while the compressor is
operating.
When the outdoor heat exchanger temperature exceeds 70:
during cooling or when indoor gas pipe temperature exceeds 70:
during heating
When a failure is detected in the operation of the converter during
operation.
LED2
LED1
OB389 --2qxp 05.1.26 18:15 Page 31