Boiler Water Temperature Sensor - Viessmann VITODENS 111-W Installation And Service Instructions Manual

Troubleshooting
Repairs
(cont.)

Boiler water temperature sensor

A
Fig. 35
20
10
8
6
4
2
1
0.8
0.6
0.4
10 30 50 70 90 110
Temperature in °C
Fig. 36
44
1. Pull leads from boiler water temperature sensor
and check resistance.
2. Check 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 boiler water temperature sensor is
directly immersed in the heating water (risk
of scalding).
Drain the boiler before replacing the sensor.
A