Viessmann Vitodens 100-W WB1B Installation And Service Instructions Manual page 41

Repairs
(cont.)
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.
1. Pull the leads from temperature lim-
iter A.
2. Check the continuity of the tem-
perature limiter with a multimeter. If
it is open circuit, it is faulty.
3. Remove the faulty temperature lim-
iter.
4. Install a new temperature limiter.
5. To reset press "Reset" on the con-
trol unit.
Troubleshooting
41