Daikin ESIE13-02 Service Manual page 154

Additional Checks for Troubleshooting
1
Thermistor
resistance check
3
4
5
Part 4 – Troubleshooting
Be careful when ordering spare part sensor for tank thermistor.
Remove the connectors of the thermistors on the PCB, and measure the resistance of each thermistor
using tester.
The tank thermistor is for EKHWS-B and EKHWE domestic hot water tanks.
The relationship between normal temperature and resistance is shown in the graph and the table
below:
-20
-15
-10
-5
0
5
10
15
20
25
30
35
40
45
50
Tank thermistor for EHV*CA* domestic hot water tanks.
NTC-curve tank thermistor
T°C
-20
0
25
Hydro-box
3SA48002
R25°C=20kΩ
B=3990
197.8 kΩ
148.2 kΩ
112.0 kΩ
85.52 kΩ
65.84 kΩ
51.05 kΩ
39.91 kΩ
31.44 kΩ
24.95 kΩ
19.94 kΩ
16.04 kΩ
12.99 kΩ
10.58 kΩ
8.669 kΩ
7.143 kΩ
Resistance value
197.81 kΩ
65.84 kΩ
20 kΩ
154
ESIE13-02