Viessmann Vitodens 100 Series Installation And Service Instructions Manual page 74

Troubleshooting
Repairs
(cont.)
Checking the cylinder temperature sensor (gas condensing
system boiler)
X100
20
10
8
6
4
2
1
0.8
0.6
0.4
10 30 50 70 90 110
Temperature in °C
74
%
1. Disconnect plug % from the cable
harness and check the resistance.
2. Compare the sensor resistance to
the curve.
3. In the event of severe deviation
replace the sensor.