Repair Procedures - Daikin FTXA20A Service Manual

2.6.2 Repair procedures

To remove the humidity sensor
FTXA20~50A(W)(S)(T) + FTXA20~50B(B)(S)(T) + RXA42+50A +
RXA20~35A(9) + RXA42+50B
Split Stylish R32
ESIE18-03D – 2021.05
Prerequisite: Turn OFF the respective circuit breaker.
1 Remove the required plate work, see
2 Turn ON the power of the unit.
3 Measure the power supply voltage between the pins 1‑4 on the humidity
sensor connector CN.
Result: The measured voltage MUST be 5 V DC.
a Humidity sensor (PCB)
Is the measured power supply voltage
correct?
Yes
No
4 Measure the output voltage between between the pins 1‑4 on the connector
S600 on the indoor unit main PCB.
Result: The measured voltage MUST be 5 V DC.
Is the output voltage on the indoor unit
main PCB correct?
Yes
No
5 As there are no further check procedures for this component, perform a check
of the indoor unit main PCB to check if the humidity sensor needs to be
replaced. See "2.8.1 Checking
After complete check of the indoor unit
main PCB, is the problem solved?
Yes
No
Prerequisite: Stop the unit operation via the user interface.
"2.14 Plate work" [
a
Action
Skip the next step..
Continue with the next step.
Action
Replace the humidity sensor wiring
harness, see "2.6.2 Repair
4
procedures" [
Perform a check of the indoor unit main
PCB, see "2.8.1 Checking
4
procedures" [
4
procedures" [ 75].
Action
No further actions required.
Replace the humidity sensor, see
"2.6.2 Repair
2 Components
|
4
120].
71].
75].
4
procedures" [ 71].
Service manual
71