Viessmann Vitodens 200-W Installation Instructions Manual page 139

Maintenance
(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 system has cooled
down by pressing reset button R.
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. Pull leads from flue gas temperature
A
2. Check the sensor resistance and
3. Replace the sensor in the case of
sensor A.
compare it with the curve.
severe deviation.
Troubleshooting
139