Additional Checks for Troubleshooting ESIE02–01
3–72 Part 3 – Troubleshooting
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5.8 Checking 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: Outdoor Units’
■ ‘Wiring Diagrams: Indoor Units’
■ "Functions of Thermistors: Large Heat Pumps" on page 5.
Overview of
thermistors
The table below contains an overview of the thermistors:
Checking To check the thermistors, proceed as follows:
Thermistor Description
Indoor R1T Suction air thermistor
R2T Heat exchanger thermistor (coil thermistor)
Outdoor R1T Ambient air thermistor
R2T Heat exchanger thermistor (coil thermistor)
R3T Discharge pipe 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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