Viessmann Vitodens 222-F B2TA Installation And Service Instructions Manual page 148

Troubleshooting
Repair
(cont.)
Checking 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. Remove plug ? (flow temperature
sensor).
Checking the Vitotronic 200-H (accessory)
The Vitotronic 200-H is connected to the
control unit via the LON cable. To test the
connection, carry out a subscriber check
at the boiler control unit (see page 74).
148
2. Check the sensor resistance and
compare it with the curve.
Replace the sensor in the case of
severe deviation.