Daikin FTXP20-71L, Service Manual

Page: 138 / 192

3 | Components
Service manual
138
ATXP20~35 + FTXP20~71 + ARXP20~35 + RXP20~71
Split Comfora R32
ESIE18-01E – 2023.01
▪
Measured temperature with contact thermometer: 23.1°C,
▪ Resistance value determined through temperature (using the thermistor
table A):
Resistance at 20°C: 24.3 kΩ,
Resistance at 25°C: 19.4 kΩ,
▪ Measure resistance between pin 1‑2:
Measured resistance: 21.86 kΩ,
▪
Measured resistance value is inside the range. Thermistor passes the check.
INFORMATION
All thermistors have a resistance tolerance of 3%.
Does the measured resistance of the
thermistor match with the
temperature determined resistance? Action
Yes Thermistor is OK. Return to the
troubleshooting of the specific error
and continue with the next procedure.
No Replace the specific PCB, see
"3 Components" [
4
46].
3.14 Wifi control PCB
INFORMATION
ONLY for ATXP20~35N and FTXP20~35N units.
3.14.1 Checking procedures
To perform a power check of the wifi control PCB
Prerequisite: Stop the unit operation via the user interface.
Prerequisite: Turn OFF the respective circuit breaker.
1 Remove the required plate work, see "3.9 Plate work" [
4
111].
2 Turn ON the power of the unit.
3 Measure the power supply voltage between the pins 4‑5 on the wifi control
PCB connector.
Result: The measured voltage MUST be 10~16 V DC.