Viessmann VITOLADENS 300-W Installation And 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. Disconnect plug ? (flow tempera-
ture sensor).
Checking the Vitotronic 200-H (accessories)
The Vitotronic 200-H is connected to the
control unit via the LON system. To test
the connection, carry out a subscriber
check at the boiler control unit (see
page 51).
2. Check the sensor resistance and
compare it with the curve.
Replace the sensor in the case of
severe deviation.
Troubleshooting
111