Operating instructions

40
10
1
10 30 50 70 90 110
Temperature in °C
0.4
0.6
0.8
2
4
6
8
20
Resistance in kΩ
2. Check the sensor resistance and
compare it with the curve.
3. In case of severe deviation, drain
boiler on the heating water side and
replace the sensor.
Danger
The boiler water temperature
sensor is immersed in the
heating water (risk of scald-
ing).
Drain the boiler before replac-
ing the sensor.
Checking cylinder temperature sensor (gas fired condensing
boiler)
X21 X7
X20
5
X21 X7
X20
5
1.
Remove plugs % from the cable har-
ness and check the resistance.
Troubleshooting
Repairs
(cont.)
5366 836 GB