Check No.3 - Checking The Thermistors - Daikin ESIE13-02 Service Manual

Additional Checks for Troubleshooting
6.3

Check No.3 - Checking the Thermistors

1
Thermistors
Overview of
thermistors
3
4
5
Checking
Part 4 – Troubleshooting
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:
"External connection diagram" (outdoor unit)

"System Operation" on page 22

The table below contains an overview of the thermistors:
Thermistor
Hydro-box R1T
R1T (A2P)
R1T (A3P)*
R2T
R2T*
R3T
R4T
R5T*
R6T*
Outdoor R1T
R2T
R3T
R4T
R5T
R6T
R10T
R7T
* = optional
To check the thermistors, proceed as follows:
Step Action
Disconnect the thermistor from the PCB.
1
Read the temperature and the resistor value.
2
Check if the measured values correspond with the values in the table on the next pages.
3
Description
Outlet water after PHE thermistor
Ambient sensor user interface
Ambient sensor ON/OFF thermistor
Outlet water after BUH thermistor
External sensor (floor or ambient)
Refrigerant liquid thermistor
Inlet water thermistor
Domestic hot water tank thermistor
External indoor or outdoor ambient thermistor
Ambient air thermistor
Discharge pipe thermistor
Suction pipe thermistor
Heat exchanger thermistor
Intermediate heat exchanger thermistor
Liquid pipe thermistor
Power module fin thermistor ERHQ V3* / ERLQ V3*
Power module fin thermistor ERHQ W1* / ERLQ W1*
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ESIE13-02