Viessmann Vitodens 100 Series Installation And Service Instructions Manual page 75

Repairs
(cont.)
Checking the outlet temperature sensor (gas condensing
combi boiler)
20
10
8
6
4
2
1
0.8
0.6
0.4
10 30 50 70 90 110
Temperature in °C
1. Disconnect leads from outlet tem-
perature sensor A $.
2. Check the sensor resistance and
A
compare it to the curve.
3. In the event of severe deviation
replace the sensor.
■ Shut off the cold water supply.
■ Drain the DHW line and the plate
Troubleshooting
heat exchanger (on the DHW
side).
75