MITSUBISHI ELECTRIC MUZ-GB50VA - Manual (Page 25)

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B B Check of outdoor thermistors
• When OPERATION INDICATOR lamp flashes 6-time.
• When thermistor is abnormal.
Yes
Yes
No
No
Reconnect the connector CN661, CN663 and CN3.
3 minutes after turning on the power supply, start EMERGENCY OPERATION.
Defrost
Discharge temperature
Outdoor heat exchanger temperature
Ambient temperature
Fin temperature
Symbol
RT61
RT62
RT68
RT65
RT64
Connector, Pin No. Thermistor Board
Between CN661 pin1 and pin2
Between CN661 pin3 and pin4
Between CN661 pin7 and pin8
Between CN663 pin1 and pin2
Between CN3 pin1 and pin2
Outdoor electronic control P.C. board
Outdoor power board
Disconnect the connector in the outdoor electronic control P.C. board or the outdoor power board
(see below table), and measure the resistance of thermistor. Is the thermistor normal?
Does the unit operate 10 minutes or more without
showing thermistor abnormality?
Replace the thermistor.
Normal
Replace the outdoor electronic
control P.C. board.
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