Mitsubishi Electric Mr. SLIM MSZ-FA25VA Technical Manual página 441

• When thermistor is abnormal. (When the LED display is a table below.)
F Check of outdoor thermistors
Disconnect the connector in the following table and measure the resistance of the
thermistor to check whether the thermistor is normal or not.
Normal
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.
Does thermistor operate 10 minutes or more though the
thermistor abnormality is not displayed?
Yes
Normal
MXZ-2A40/2A52
Thermistor
Defrost
Discharge temperature
Outdoor heat exchanger temperature
Fin temperature
Ambient temperature
MXZ-3A54/4A71/4A80
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
No
Replace the outdoor electronic
control P.C. board.
Symbol Connector, Pin No.
RT61 Between CN661 pin1 and pin2
RT62 Between CN661 pin3 and pin4
Between CN661 pin5 and pin6
RT68
Between CN662 pin1 and pin2
RT64
Between CN663 pin1 and pin2
RT65
Symbol Connector, Pin No.
RT61 Between CN661 pin1 and pin2
RT62 Between CN661 pin3 and pin4
RT68 Between CN661 pin7 and pin8
RT6A Between CN662 pin1 and pin2
RT6B Between CN662 pin3 and pin4
RT6C Between CN662 pin5 and pin6
Between CN662 pin7 and pin8
RT6D
Between CN663 pin1 and pin2
RT65
Between CN3 pin1 and pin2
RT64
Resolución de averías
Abnormal
Replace the thermistor.
Board
Inverter P.C. board
Board
Outdoor electronic control P.C. board
Outdoor power board
441