Daikin FTXA20A - Page 112

2 | Components
Service manual
112
FTXA20~50A(W)(S)(T) + FTXA20~50B(B)(S)(T) + RXA42+50A +
RXA20~35A(9) + RXA42+50B
Split Stylish R32
ESIE18-03D – 2021.05
▪ For any burnt‑out part or wire. If found, replace the fan motor, see "Repair
procedures"[4113].
▪ That fan motor fixation bolts are correctly installed and fixed. Correct as
needed.
2 Manually rotate the fan motor shaft. Check that it rotates smoothly.
3 Check the friction of the DC fan motor shaft bearing.
Is the DC fan motor shaft friction
normal?
Action
Yes Perform an electrical check of the DC
fan motor assembly, see "Checking
procedures"[4111].
No Replace the DC fan motor assembly, see
"Repair procedures"[4113].
To perform an electrical check of the DC fan motor assembly
1 First perform a mechanical check of the DC fan motor assembly, see "Checking
procedures"[4111].
INFORMATION
Check the DC fan motor power supply (voltage) circuit on the PCB.
2 Turn ON the power of the unit.
3 Activate Cooling or Heating operation via the user interface.
4 Check the functioning of the outdoor unit fan.
Outdoor unit fan … Action
Rotates continuously (without
interruption)
DC fan motor assembly is OK. Return to
the troubleshooting of the specific error
and continue with the next procedure.
Does not rotate or rotates for a short
time
Continue with the next step.
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 Check that the DC fan motor connector is properly connected to the PCB.
8 Unplug the DC fan motor connector and measure the resistance between the
pins 1-3, 1-5, and 3-5 of the DC fan motor connector.
Result: All measurements MUST be 52.7~58.3Ω.
INFORMATION
Winding resistance values above are given for reference. You should NOT be reading
a value in kΩ or a short‑circuit. Make sure that the propeller fan blade does NOT
rotate, as this could affect resistance measurements.
9 Set the Megger voltage to 500VDC or 1000VDC.