Viessmann VITODENS 111-W Installation And Service Instructions Manual page 46

Troubleshooting
Repairs
(cont.)
Checking cylinder temperature sensor
X21 X21 X7 X7
X20 X20
5 5
20
10
8
6
4
2
1
0.8
0.6
0.4
10 30 50 70 90 110
Temperature in °C
46
1. Pull plug % from the cable harness.
2. Check the sensor resistance and
compare it with the curve.
3. Replace the sensor in the case of
severe deviation.