Heat exchanger liquid temperature
thermistor
Heat exchanger middle temperature
thermistor
Heat exchanger liquid temperature thermistor short or open detected
Heat exchanger middle temperature thermistor short or open detected
1. Connector connection defective, open
2. Thermistor failure
3. Main PCB failure
OK
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".
02-23
Heat Ex.(Middle/Outlet) Temp.
Thermistor Error
Trouble shooting 22
Detective Actuators:
Detec
tive details:
OUTDOOR UNIT Error Met
hod:
Forecast of Cause :
Indicate or Display:
Error code : 73
Outdoor unit : No indication
DC
Check Point 3 : Check voltage of Main PCB (DC5.0V)
Main PCB P1 :1-2 voltage value =5V and P10 :1-2 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.
THERMISTOR
(PIPE.)
THERMISTOR
(DIS.PIPE.)
P1
BLACK
BLACK
BLACK
BLACK
4 3 2 1
4 3 2 1
THERMISTOR
(PIPE MID.)
P10
BLACK
BLACK
3 2 1
3 2 1
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