Viessmann FB2B Installation And Service Instructions Manual page 120

Troubleshooting
Repairs
(cont.)
Checking the outlet temperature sensor
A
20
10
8
6
4
2
1
0.8
0.6
0.4
10 30 50 70 90 110
Temperature in °C
120
1. Pull the leads from outlet temperature
sensor A.
2. Check the sensor resistance and
compare it with the curve.
3. Replace the sensor in case of severe
deviation.
Danger
The outlet temperature sen-
sor is immersed in the DHW
(risk of scalding).
Drain the DHW side of the
boiler before replacing the
sensor.