Viessmann Vitodens 200-W Installation Instructions Manual page 142

Troubleshooting
Maintenance
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. Disconnect plug ? (flow tempera-
ture sensor).
Check Vitotronic 200-H (accessory)
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 61).
142
(cont.)
3. Refit the casing cover.
2. Check the sensor resistance and
compare it with the curve.
Replace the sensor in the case of
severe deviation.