ESIE15-13B Troubleshooting by Remote Controller
Service Diagnosis 185
4.41 Check
Check the Thermistors
Thermistors
If the cause of the problem is related to the thermistors, then the thermistors should be checked
prior to changing the PCB.
For more information about these thermistors, see:
“Wiring Diagrams’’ on P.199
“Functions of Main Components and Thermistors” on P.28
Overview of Thermistors
The table below contains an overview of the thermistors:
Indoor
Outdoor
Checking
To check the thermistors, proceed as follows:
FCQG, FHQG Thermistor
R1T Suction air thermistor
R2T Heat exchanger thermistor
R3T Intermediate heat exchanger thermistor
RZQG Thermistor
R1T Outdoor air thermistor
R2T Discharge pipe thermistor
R3T Suction pipe thermistor
R4T Heat exchanger distributor pipe thermistor
R5T Intermediate heat exchanger thermistor
R6T Liquid pipe thermistor
R10T Radiation fin thermistor
Step Action
1 Disconnect the thermistor from the PCB
2 Read the temperature and the resistor value.
3 Check if the measured values correspond with the values in the table on the next pages.
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