Thermistors; Checking Procedures - Daikin Sky Air FAA71BUV1B Service Manual

4.9 Thermistors

4.9.1 Checking procedures

To perform a mechanical check of the specific thermistor
To perform an electrical check of the specific thermistor
FAA71+100BUV1B
Sky Air indoor units
ESIE22-01 – 2022.02
WARNING
When reconnecting a connector to the PCB, make sure to connect it on the correct
location and do NOT apply force, as this may damage the connector or connector
pins of the PCB.
4 Install new tie straps to fix the wiring harness as needed.
Is the problem solved?
Yes
No
INFORMATION
It is recommended to perform the checks in the listed order.
Prerequisite: Stop the unit operation via the user interface.
Prerequisite: Turn OFF the respective circuit breaker.
Prerequisite: Remove the required plate work, see
1 Locate the thermistor and remove the insulation if needed. Check that the
thermistor is correctly installed and that there is thermal contact between the
thermistor and the piping or ambient (for air thermistor).
Is the thermistor correctly installed
(thermal contact between the
thermistor and the piping)?
Yes
No
1 First perform a mechanical check of the thermistor, see
4
procedures" [ 77].
2 Locate the thermistor.
INFORMATION
Remove the thermistor from its holder if not reachable with a contact thermometer.
3 Measure the temperature using a contact thermometer.
4
Action
No further actions required.
Return to the troubleshooting of the
specific error and continue with the
next procedure.
"4.6 Plate work" [
Action
Perform an electrical check of the
specific thermistor, see
4
procedures" [ 77].
Correctly install the thermistor, see
"4.9.2 Repair procedures" [
Components
|
4
60].
"4.9.1 Checking
4
80].
"4.9.1 Checking
Service manual
77