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Components
Service manual
116
(A)(F)TXF20~71A + FTXF20~25B + (A)(F)TXF20~42C + (A)(F)TXF20~42D +
(A)(F)TXF20~42E + (A)RXF20~71A + RXF20~60B + (A)RXF20~42C +
(A)RXF20~42D + (A)RXF20~42E
Split Sensira R32
ESIE18-12G – 2023.01
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
89].
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 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
89].
No
Replace the DC fan motor, see
(A)RXF20~35D + (A)RXF20~42E units
1
First perform a mechanical check of the DC fan motor assembly, see
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.