Viessmann VITODENS 050-W Installation And Service Instructions Manual page 65

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
A
limiter.
1. Disconnect the leads from tempera-
ture limiter A.
2. Check the continuity of the temper-
ature limiter with a multimeter.
3. Remove faulty temperature limiter.
4. Install a new temperature limiter.
5. Reset by pressing "Reset" on the
control unit (see page 59).
Troubleshooting
65