Daikin SkyAir RZR-P Series, Service Manual

Page: 184 / 202

Troubleshooting by Remote Controller SiUS281117
Service Diagnosis 177
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.187
Overview of Thermistors
The table below contains an overview of the thermistors:
Indoor
Outdoor
Checking
To check the thermistors, proceed as follows:
CHECK 5
FCQ FHQ FAQ FBQ FTQ Thermistor
Table
(on following page)
R1T R1T R1T R1T — Suction air thermistor 2
R2T R2T R2T R2T R1T Heat exchanger liquid pipe thermistor 2
R3T R3T R3T R3T R2T Heat exchanger gas pipe thermistor 2
— — — R4T — Discharge air thermistor 3
— — — R5T — NTC thermistor 2
RZR18-30
RZQ18-30 RZR36·42
RZQ36·42
Thermistor
Table
(on following page)
R1T R1T Outdoor air thermistor 2
R2T R2T Discharge pipe thermistor 3
R3T, R5T R3T, R5T Suction pipe thermistor 2
R4T R4T Heat exchanger thermistor 2
— R6T Subcooling heat exchanger thermistor 2
— R7T Liquid pipe thermistor 2
R10T FINTH Radiation fin thermistor 1
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.