Mitsubishi Electric SUZ-SWM30VA TH Series Service Manual page 31

G Check of outdoor thermistors
Disconnect the connector of thermistor in the inverter P.C. board (see
below table), and measure the resistance of thermistor.
Is the resistance of thermistor normal?
(Refer to 12-6.1.)
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.)
SUZ-SWM30VA SUZ-SHWM30VAH
SUZ-SWM40VA2 SUZ-SWM40VA2-SC
SUZ-SWM60VA2 SUZ-SWM60VA2-SC
Thermistor
Defrost
Discharge temperature
Fin temperature
Ambient temperature
Outdoor heat exchanger temperature
SUZ-SHWM60VAH SUZ-SHWM60VAH-SC
SUZ-SWM80VA2 SUZ-SWM80VAH2
SUZ-SWM100VA SUZ-SWM100VAH
Thermistor
Defrost
Discharge temperature
Fin temperature
Ambient temperature
Outdoor heat exchanger temperature
OCH796A
No
Yes
No
Yes
SUZ-SHWM40VAH
Symbol Connector, Pin No.
RT61 Between CN641 pin1 and pin2
RT62 Between CN641 pin3 and pin4
RT64 Between CN642 pin1 and pin2
RT65 Between CN643 pin1 and pin2
RT68 Between CN644 pin1 and pin3
Symbol Connector, Pin No.
RT61 Between CN671 pin1 and pin2
RT62 Between CN671 pin3 and pin4
RT64 Between CN673 pin1 and pin2
RT65 Between CN672 pin1 and pin2
RT68 Between CN671 pin5 and pin6
31
Replace the thermistor except RT64.
When RT64 is abnormal, replace the
inverter P.C. board.
Replace the inverter P.C. board.
SUZ-SHWM40VAH-SC
Inverter P.C. board
Inverter P.C. board
Board
Board