Viessmann FB2A Installation And Service Instructions For Contractors page 99

Repairs
(cont.)
Checking the outlet temperature sensor
20
10
8
6
4
2
1
0.8
0.6
0.4
10 30 50 70 90 110
Temperature in °C
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.
Troubleshooting
99