Viessmann VITODENS 111-W Installation And Service Instructions Manual page 64

Troubleshooting
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.
64
1. Pull the leads from temperature lim-
iter A.
2. Check the continuity of the tempera-
A
ture limiter with a multimeter.
3. Remove faulty temperature limiter.
4. Install a new temperature limiter.
5. Reset by pressing "Reset" on the
control unit to (see page 58).