Mitsubishi Electric MXZ-2F33VF4-E1 Service Manual page 200

• When thermistor is abnormal.
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. (Refer to 12-7.)
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 the unit operate 10 minutes or more without
showing thermistor abnormality?
Yes
Normal
MXZ-2F33VF/2F42VF/2F53VF
MXZ-2F33VF2/2F42VF2/2F53VF2
MXZ-2F33VF3/2F42VF3/2F53VF3
MXZ-2F33VF4/2F42VF4/2F53VF4
MXZ-2F53VFH
MXZ-2F53VFH2
MXZ-2F53VFH3
MXZ-2F53VFH4
Thermistor
Defrost
Discharge temperature
Fin temperature
Ambient temperature
Outdoor heat exchanger temperature
MXZ-3F54VF/3F68VF/4F72VF
MXZ-3F54VF2/3F68VF2/4F72VF2/4F80VF2
MXZ-3F54VF3/3F68VF3/4F72VF3/4F80VF3
MXZ-3F54VF4/3F68VF4/4F72VF4/4F80VF4
Thermistor
Defrost
Discharge temperature
Outdoor heat exchanger temperature
Ambient temperature
Fin temperature
OBH790L
Replace the thermistor except RT64.
If RT64 is abnormal, replace the outdoor power
Abnormal
P.C. board since RT64 is combined with this board.
Replace the outdoor control P.C. board or the
outdoor power P.C. board.
No
Symbol Connector, Pin No.
CN641 pin1 and pin2
RT61
CN641 pin3 and pin4
RT62
RT64 CN642 pin1 and pin2
RT65 CN643 pin1 and pin2
RT68 CN644 pin1 and pin3
MXZ-4F83/5F102/6F112VF
MXZ-2F53/4F83VFHZ
MXZ-4F83/5F102/6F112VF2
MXZ-2F53/4F83VFHZ2
Symbol Connector, Pin No.
Between CNTH1 pin1 and pin2
RT61
Between CNTH1 pin3 and pin4
RT62
RT68 Between CNTH1 pin7 and pin8
RT65 Between CNTH2 pin1 and pin2
RT64 Between CN171 pin1 and pin2
200
Board
Inverter P.C. board
Board
Outdoor control P.C. board
Outdoor power P.C. board