Daikin FTXA20AW - Repair Procedures

2 | Components
Service manual
71
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 "2.14Plate work"[4120].
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
a Humidity sensor (PCB)
Is the measured power supply voltage
correct?
Action
Yes Skip the next step..
No Continue with the next step.
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?
Action
Yes Replace the humidity sensor wiring
harness, see "2.6.2Repair
procedures"[471].
No Perform a check of the indoor unit main
PCB, see "2.8.1Checking
procedures"[475].
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 procedures"[475].
After complete check of the indoor unit
main PCB, is the problem solved?
Action
Yes No further actions required.
No Replace the humidity sensor, see
"2.6.2Repair procedures"[471].
2.6.2 Repair procedures
To remove the humidity sensor
Prerequisite: Stop the unit operation via the user interface.