Service manual

20
Outdoor power system
When the compressor operation has been interrupted by overcurrent
protection continuously three times within 1 minute after start-up.
• Check the inverter / compressor.
Refer to “E” on page 24.
Indication
LED 1
(red)
LED 2
(Yellow)
Abnormal point Detecting method Check points
Symptom: Outdoor unit does not operate.
LED 1 (red)
Lighting
LED 2 (yellow)
Lighting
Error mode
Normal
Lighting
Troubleshooting check table <OUTDOOR UNIT>
Twice
Outdoor control system
When the nonvolatile memory data cannot be read properly on the out-
door electronic control P.C. board.
• Replace the outdoor electronic control
P.C. board.
Lighting
7 times
DC voltage sensing cir-
cuit
When DC voltage sensing circuit detects 57V or below or 395V or above
• Replace the outdoor electronic control
P.C. board.
Lighting
9 times
Indoor unit and LEV
When the drain abnormality is detected in the indoor unit and the indoor
unit coil temperature is too low, or when any abnormality is detected in
the components of indoor unit.
• Check the abnormality indication on the
indoor unit.
• Check the LEV.
Refer to “D” on page 24.
6 times Goes out
Discharge temperature
thermistor
When a short or open circuit occurs in the discharge temperature ther-
mistor during compressor running.
• Check the characteristic of the discharge
temperature thermistor.
Refer to “F” on page 25.
• Check the connector. (CN663)
Indication
LED 1
(red)
LED 2
(Yellow)
Abnormal point Detecting method Check points
Symptom: Outdoor unit repeats to stop and restart in 3 minutes
Lighting
3 times
Fin temperature ther-
mistor
When a short or opern circuit occurs in the fin temperature thermistor
during compressor running.
• Check the characteristic of the fin temper-
ature thermistor.
Refer to “F” on page 25.
• Check the connector. (CN664)
Lighting
4 times
Evaporation tempera-
ture thermistor
When a short or open circuit occurs in the evaporation temperature ther-
mistor during compressor running.
• Check the characteristic of the evaopra-
tion temperature thermistor.
Refer to “F” on page 25.
• Check the connector. (CN663)
Lighting
10 times
Gas pipe temperature A
thermistor
When a short or open circuit occurs in the gas pipe temperature A ther-
mistor during compressor running.
• Check the characteristic of the gas pipe
temperature A thermistor.
Refer to “F” on page 25.
• Check the connector. (CN661)
Lighting
11 times
Gas pipe temperature B
thermistor
When a short or open circuit occurs in the gas pipe temperature B ther-
mistor during compressor running.
• Check the characteristic of the gas pipe
temperature B thermistor.
Refer to “F” on page 25.
• Check the connector. (CN661)
Lighting
12 times
Over current protection When over current is applied to the power module.
• Check the inverter / compressor.
Refer to “E” on page 24.
• Check the amount of gas.
• Check the indoor / outdoor air flow for
short cycle.
• Check the indoor unit air filter for clogging.
Twice Goes out
P.C. board temperature
thermistor
When a short or open circuit occurs in the P.C. board temperature ther-
mistor during compressor running.
• Replace the outdoor electronic control
P.C. board.
Lighting
5 times
Discharge temperature
overheat protection
When the discharge temperature thermistor detects 116: or above.
(Protection will be released at 100: or below.)
• Check the amount of gas and the refriger-
ant cycle.
• Check the outdoor unit air passage.
3 times Goes out
Fin temperature over-
heat protection
When the fin temperature thermistor detects 91: or above.
• Check the outdoor unit air passage.
• Check the outdoor fan motor.
Refer to “G” on page 25.
• Check the power module.
4 times Goes out
P.C. board temperature
overheat protection
When the P.C. board temperature thermistor detects 79: or above.
• Check the outdoor unit air passage.
• Check the outdoor fan motor.
Refer to “G” on page 25.
• Replace the outdoor electronic control
P.C. board.
4 times Goes out
OB280-1.qxp 02.12.19 11:15 AM Page 20