Outdoor Thermistor Error
OK
Outdoor temperature thermistor
Outdoor temperature thermistor short or open detected
1. Connector connection defective, open
2. Thermistor failure
3. Main PCB failure
OK
Check Point 1 : Check the connector connection and cable open
Connector connection state check
Cable open check
Check Point 2: Check the thermistor
Thermistor characteristics check (Disconnect the thermistor from the PCB and check.)
* For the thermistor characteristics, refer to the "Service Parts Information 8".
02-24
Trouble shooting 23
Detective Actuators:
Detective details:
OUTDOOR UNIT Error Method:
Forecast of Cause :
Indicate or Display:
Error code : 74
Outdoor unit : No indication
OK
DC
Check Point 3 : Check voltage of Main PCB (DC5.0V)
Main PCB P5 :1-3 voltage value =5V
Remove the thermistor from Main PCB, check the voltage.
If the voltage does not appear, replace Main PCB, and execute
the check operation again.
BLACK
BLACK
P5
THERMISTOR
(OUT TEMP.)
3 2 1
3 2 1
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