Viessmann VITODENS 050-W Installation And Service Instructions Manual page 67

Repairs
(cont.)
Checking the flue gas temperature sensor
A
3. In the event of severe deviation
replace the sensor.
Note
Water may escape when replacing
the outlet temperature sensor. Shut
off the cold water supply. Drain the
DHW line and the plate heat
exchanger (on the DHW side).
1. Disconnect leads at flue gas tem-
perature sensor A.
2. Check sensor resistance and com-
pare it to the curve.
Troubleshooting
67