Viessmann VITODENS 100-W Installation And Service Instructions Manual page 35

Repairs
(cont.)
20
10
8
6
4
2
1
0.8
0.6
0.4
10 30 50 70 90 110
Temperature in °C
Checking the temperature limiter
If the burner control unit cannot be reset after a fault shutdown, although the boiler
water temperature is below approx. 95 °C, check the temperature limiter.
2. Check the sensor resistance and
3. Replace the sensor if the resistance
1. Pull the leads from temperature lim-
2. Check the continuity of the tempera-
3. Remove the faulty temperature lim-
4. Install a new temperature limiter.
5. Press "Reset" on the control unit (see
A
compare it with the curve.
varies significantly from the figure
shown.
iter A.
ture limiter with a multimeter.
iter.
page 30).
Troubleshooting
35