68
F
F
Check of outdoor thermistors
• When thermistor is abnormal. (When the LED display is a table below.)
Normal
Yes
No
Abnormal
Reconnect the connector in the following table and disconnect the lead wire leading to the compressor.
3 minutes after turning on the power supply, start EMERGENCY OPERATION.
Thermistor
Defrost
Discharge temperature
Outdoor heat exchanger temperature
Fin temperature
Ambient temperature
Symbol
RT61
RT62
RT68
RT64
RT65
Connector, Pin No.
Between CN661 pin1 and pin2
Between CN661 pin3 and pin4
Between CN661 pin5 and pin6
Between CN662 pin1 and pin2
Between CN663 pin1 and pin2
Inverter P.C. board
Board
Thermistor
Defrost
Discharge temperature
Outdoor heat exchanger temperature
Gas pipe temperature (Unit A)
Gas pipe temperature (Unit B)
Gas pipe temperature (Unit C)
Gas pipe temperature (Unit D)
Ambient temperature
Fin temperature
Symbol
RT61
RT62
RT68
RT6A
RT6B
RT6C
RT6D
RT65
RT64
Connector, Pin No.
Between CN661 pin1 and pin2
Between CN661 pin3 and pin4
Between CN661 pin7 and pin8
Between CN662 pin1 and pin2
Between CN662 pin3 and pin4
Between CN662 pin5 and pin6
Between CN662 pin7 and pin8
Between CN663 pin1 and pin2
Between CN3 pin1 and pin2
Outdoor electronic control P.C. board
Outdoor power board
Board
Disconnect the connector in the following table and measure the resistance of the
thermistor to check whether the thermistor is normal or not.
Does thermistor operate 10 minutes or more though the
thermistor abnormality is not displayed?
Replace the thermistor.
Normal
Replace the outdoor electronic
control P.C. board.
MXZ-3A54/4A71/4A80
MXZ-2A40/2A52
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