Viessmann VITODENS 200-W Service Instructions Manual page 111

Repair
(cont.)
Check flow temperature sensor
Pressure drop curve
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
1. Pull plug ? (flow temperature sen-
sor).
Checking the Vitotronic 200-H (accessories)
The Vitotronic 200-H is connected to the control unit via the LON. To test the con-
nection, carry out a subscriber check at the boiler control unit (see page 36).
2. Check the sensor resistance and
compare it with the curve.
Replace the sensor in the case of
severe deviation.
Troubleshooting
111