Daikin Sky Air FAA71BUV1B Service Manual page 50

4 | Components
To perform an electrical check of the DC fan motor assembly
Service manual
50
Is the DC fan motor shaft friction
normal?
No
1 First perform a mechanical check of the DC fan motor assembly, see
"4.4.1 Checking procedures" [
INFORMATION
Check the DC fan motor power supply (voltage) circuit on the PCB.
2 Turn ON the power of the unit.
3 Activate Fan ONLY via the user interface.
4 Check the functioning of the indoor unit fan.
Indoor unit fan ...
Rotates continuously (without
interruption)
Does not rotate or rotates for a short
time
INFORMATION
The DC fan motor connector MUST be plugged into the appropriate PCB.
5 Turn OFF the unit via the user interface.
6 Turn OFF the respective circuit breaker.
DANGER: RISK OF ELECTROCUTION
Wait for at least 10 minutes after the circuit breaker has been turned OFF, to be sure
the rectifier voltage is below 10 V DC before proceeding.
7 Disconnect the DC fan motor connector X20A and measure the resistance on
the connector pins shown below.
Result: The measured resistance MUST be:
VDC
1
2
3
7
INFORMATION
The measured resistance values may deviate from the listed values due to instability
during the measurements.
Action
Replace the DC fan motor assembly, see
"4.4.2 Repair
4
49].
Action
DC fan motor assembly is OK. Return to
the troubleshooting of the specific error
and continue with the next procedure.
Continue with the next step.
Comm
4
4
4
4
4
procedures" [ 52].
Resistance
>1 MΩ
>100 kΩ
>100 Ω
>100 kΩ
FAA71+100BUV1B
Sky Air indoor units
ESIE22-01 – 2022.02