Viessmann Vitodens 200 Service Manual page 87

Repairs
(cont.)
Checking the outlet or comfort sensor (only on gas fired
combination boilers)
2. Check the sensor resistance and
compare actual values with the
curve.
3. Replace the sensor in case of
severe deviation.
Danger
The boiler temperature sen-
sor is immersed in the heat-
ing water (risk of scalding).
Drain the boiler before repla-
cing the sensor.
1. Pull the leads from outlet tempera-
ture sensor A or comfort sensor
B.
2. Check the sensor resistance and
compare actual values with the
curve.
Troubleshooting
87