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

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. Pull the leads from boiler water tem-
perature sensor A and check the
resistance.
2. Check the sensor resistance and
compare it with 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 immersed in the
heating water (risk of scald-
ing).
Drain the boiler before replac-
ing the sensor.
Troubleshooting
45