40
Check of outdoor fan motor
• Fan motor does not operate or stops operating shortly after starting the operation.
Check of outdoor thermistors
• When OPERATION INDICATOR lamp flashes 6-time.
• When thermistor is abnormal.
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?
(Refer to 11-7.1.)
Does the unit operate for 10 minutes or more without
showing thermistor abnormality?
Replace the thermistor.
Normal
Replace the outdoor electronic
control P.C. board.
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
When RT64 is abnormal,
replace
the
outdoor power
board.
Yes
No
No
Yes
Yes
No
(Fixed to either 5V or 0 VDC)
Check the connection between the
connector CN931 and CN932.
Disconnect CN932 from outdoor electronic control P.C. board, and
turn ON the power supply.
Rotate the outdoor fan motor manually and measure the voltage of
CN931.
Between (+) and (-)
Between (+) and (-)
Between (+) and (-)
Is the resistance between each terminal
of outdoor fan motor normal?
Does the outdoor fan motor rotate smoothly?
Does the voltage between each terminal become 5 VDC and 0 VDC
repeatedly?
Replace the outdoor DC fan motor.
Replace the outdoor electronic control P.C. board.
Содержание MUZ-GA50VA-E1
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