Checking The Cylinder Temperature Sensor (Gas Condensing System Boiler) - Viessmann VITODENS 100-W Installation And Service Instructions Manual

Repairs
(cont.)

Checking the cylinder temperature sensor (gas condensing system boiler)

X21 X21 X7 X7
X20 X20
5
Fig. 42
20
10
8
6
4
2
1
0.8
0.6
0.4
10 30 50 70 90 110
Temperature in °C
Fig. 43
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.
Troubleshooting
55