30
G Check of outdoor thermistors
Replace the thermistor except RT64.
When RT64 is abnormal, replace the inverter P.C.
board.
Replace the inverter P.C. board.
No
No
Is the resistance of thermistor normal?
(Refer to 10-6.1.)
Reconnect the connector of thermistor.
Turn ON the power supply and press the emergency operation switch.
Does the unit operate for 10 minutes or more
without showing thermistor abnormality?
OK
(Cause is poor contact.)
Yes
Yes
Disconnect the connector of thermistor in the inverter P.C. board (see
below table), and measure the resistance of thermistor.
MUZ-GS30/36 MUY-GS30/36
Thermistor
Symbol
Connector, Pin No.
Board
Defrost
RT61 Between CN671 pin1 and pin2
Inverter P.C. board
Discharge temperature
RT62 Between CN671 pin3 and pin4
Fin temperature
RT64 Between CN673 pin1 and pin2
Ambient temperature
RT65 Between CN672 pin1 and pin2
Outdoor heat exchanger temperature RT68 Between CN671 pin5 and pin6
OBH875
