Viessmann FB2B Installation And Service Instructions Manual page 119

Repairs
(cont.)
aVG % &
100
10
1
0.1
0 20 25
Temperature in °C
A Collector temperature sensor
B Cylinder temperature sensor
1. ■ Cylinder temperature sensor
A
B
40 60 80
2. Compare the sensor resistance with
3. Replace the sensor in case of severe
Troubleshooting
Remove plug % from solar control
module A and measure the resist-
ance.
■ Collector temperature sensor
Disconnect lead from terminal box
B and measure its resistance.
B
A
100 120 140
the curve.
deviation.
119