45
Boiler water temperature sensor
A
Fig. 36
1.
Disconnect leads from boiler water temperature
sensor
A
and check the resistance.
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
Fig. 37
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 boiler water temperature sensor is
directly immersed in the heating water (risk
of scalding).
Drain the boiler before replacing the sensor.
Troubleshooting
Repairs
(cont.)
5697789
Diagnosis
Summary of Contents for Vitodens 111-W
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