Outdoor Thermistor Error
OK
OK
DC
P5
THERMISTOR (OUT TEMP. )
BLACK
BLACK
3
2
1
3
2
1
Outdoor temperature thermistor
Outdoor temperature thermistor short or open detected
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".
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.
02-26
Trouble shooting 25
Detective Actuators:
Detective details:
OUTDOOR UNIT Error Method:
Indicate or Display:
Error code : 74
Outdoor unit : No indication
1. Connector connection failure, open
2. Thermistor failure
3. Main PCB failure
Forecast of Cause :
