Viessmann Vitodens 100 Series Installation And Service Instructions Manual page 73

Repairs
(cont.)
Boiler water temperature sensor
A
20
10
8
6
4
2
1
0.8
0.6
0.4
10 30 50 70 90 110
Temperature in °C
1. Disconnect leads from boiler water
temperature sensor A § and
check the resistance.
2. Check the sensor resistance and
compare it to the curve.
3. In the case of severe deviation,
drain the boiler on the heating
water side and replace the sensor.
Danger
The sensor is immersed in
the heating water (risk of
scalding).
Drain the boiler before
replacing the sensor.
Troubleshooting
73