Viessmann VITODENS 200-W Service Instructions Manual page 82

Troubleshooting
Repairs
(cont.)
Checking the flue gas temperature sensor
The flue gas temperature sensor locks out the boiler when the permissible flue gas
temperature is exceeded. Reset the interlock after the flue gas system has cooled
down by pressing "E RESET".
A
20
10
8
6
4
2
1
0.8
0.6
0.4
10 30 50 70 90 110
Temperature in °C
82
1. Pull the leads from flue gas tempera-
ture sensor A.
2. Check the sensor resistance and
compare it with the curve.
3. Replace the sensor in case of severe
deviation.