31
Thermistor
Symbol
Connector, Pin No.
Board
Defrost (
MUZ
)
RT61
Between CN661 pin1 and pin2
Outdoor electronic control P.C. board
Discharge temperature
RT62
Between CN661 pin3 and pin4
Outdoor heat exchanger temperature RT68
Between CN661 pin7 and pin8
Ambient temperature
RT65
Between CN663 pin1 and pin2
Fin temperature
RT64
Between CN3 pin1 and pin2
Outdoor power board
Is the thermistor normal? (Refer to 10-6.1.)
Reconnect the connector of thermistor.
Turn ON the power supply and press EMERGENCY OPERATION switch.
No
Replace the thermistor except RT64.
When RT64 is abnormal, replace the
outdoor power board.
Does the unit operate for 10 minutes or more
without showing thermistor abnormality?
OK.
(Cause is poor contact.)
Replace the outdoor power board.
Yes
Yes
No
B Check of outdoor thermistors
Disconnect the connector of thermistor in the outdoor P.C. board (see
below table), and measure the resistance of thermistor.
