Viessmann Vitotwin 300-W Installation And Service Instructions For Contractors page 141

Repairs
(cont.)
20
10
8
6
4
2
1
0.8
0.6
0.4
10 30 50 70 90 110
Temperature in °C
Sensor type: NTC 10 kΩ
Checking boiler water temperature sensor
A
2. Test the resistance of the sensor at
the disconnected plug and compare
it with the curve.
3. Replace the sensor in the case of
severe deviation.
Troubleshooting
141