Viessmann Vitovalor PT2 Installation And Service Instructions For Contractors page 146

Troubleshooting
Repairs
(cont.)
Check flow temperature sensor
20
10
8
6
4
2
1
0.8
0.6
0.4
10 30 50
Temperature in °C
Fig. 101 Sensor type: NTC 10 k
146
70 90 110
Ω
1. Disconnect plug from the extension kit.
?
2. Check the sensor resistance and compare it to the
curve.
In the event of severe deviation replace the sensor.