Daikin EBLA04E V Series Service Manual page 219

Repair procedures
To remove the thermistor
EBLA04~08E + EDLA04~08E
Daikin Altherma 3 M
ESIE22-09 – 2022.05
Thermistor – Table B
T °C kΩ T °C
0 806.5 40
5 618.9 45
10 478.8 50
15 373.1 55
20 292.9 60
25 231.4 65
30 184.1 70
35 147.4 75
5 Disconnect the thermistor connector from the appropriate PCB.
6 Measure the resistance between the appropriate pins of the thermistor
connector.
7 Check that the measured resistance value matches the resistance determined
through the measured temperature (earlier step in the procedure).
▪ E.g. R1T thermistor:
▪ Measured temperature with contact thermometer: 23.1°C,
▪ Resistance value determined through temperature (using the thermistor
table A):
Resistance at 23°C: 21.85 kΩ,
Resistance at 24°C: 20.90 kΩ,
▪ Disconnect connector and measure resistance between S90 pin 1‑2:
Measured resistance: 21.80 kΩ,
▪ Measured resistance value is inside the range. R1T thermistor passes the
check.
INFORMATION
All thermistors have a resistance tolerance of 3%.
INFORMATION
In most cases, the user interface allows to monitor the thermistors.
If the measured resistance value matches the resistance determined through the
measured temperature, but the temperature for the corresponding thermistor is
NOT correct on the user interface display, replace the applicable PCB.
Does the measured resistance of the
thermistor match with the
temperature determined resistance?
Yes
No
Prerequisite: Stop the unit operation via the user interface.
kΩ T °C kΩ
118.7 80 25.38
96.13 85 21.37
78.29 90 18.06
64.1 95 15.33
52.76 100 13.06
43.63 105 11.17
36.26 110 9.585
30.27 115 8.254
Action
Thermistor is OK. Return to the
troubleshooting of the specific error
and continue with the next procedure.
Replace the specific thermistor, see
"Repair procedures" [
draft – 31/05/2022 15:53
4 | Components
T °C kΩ
120 7.131
125 6.181
130 5.374
135 4.686
140 4.098
145 3.594
150 3.161
4
219].
Service manual
219