Daikin Sensira Series, Service Manual

Page: 94 / 172

2 | Components
Service manual
94
FTXF20~71A + FTXF20~25B + FTXF20~42C + ATXF20~71A + ATXF20~42C
+ RXF20~71A + RXF20~60B + RXF20~42C + ARXF20~71A + ARXF20~42C
Split Sensira R32
ESIE18-12E – 2021.02
10 With the DC fan motor connector S71 disconnected from the main PCB,
measure the voltage on the connector pins 10-11 (= fan motor control) on the
inverter PCB.
Result: The voltage MUST be 15±10% V DC.
Is the measured voltage correct? Action
Yes Continue with the next step.
No Perform a check of the main PCB, see
"Checking procedures" [
4
74].
11 Connect the DC fan motor connector to the PCB. Remove the plastic insert
from the connector for easier measurement.
CAUTION
Ensure that the system CANNOT start the fan. Disable all modes (heating, cooling, …)
on the unit. The outdoor unit MUST be kept powered.
12 Manually (slowly) rotate the fan blade propeller 1 turn and measure the
voltage on the DC fan motor connector pins 10-12.
Result: 4 pulses MUST be measured.
13 Repeat the previous step and measure the voltage on the DC fan motor
connector pins 10-13.
Result: 4 pulses MUST be measured.
Pulses are measured during fan blade
propeller rotation? Action
Yes Perform a check of the main PCB, see
"Checking procedures" [
4
74].
No Replace the DC fan motor, see "Repair
procedures" [
4
94].
Problem solved?
After all checking procedures listed above have been performed:
Is the problem solved? Action
Yes No further actions required.
No Return to the troubleshooting of the
specific error and continue with the
next procedure.
Repair procedures
To remove the propeller fan blade assembly
Prerequisite: Stop the unit operation via the user interface.
Prerequisite: Turn OFF the respective circuit breaker.
1 Remove the required plate work, see "2.10 Plate work" [
4
101].
2 Remove the nut that fixes the propeller fan blade assembly.