Viessmann VITODENS 200-W Service Instructions Manual page 83

Repairs
(cont.)
Checking the temperature limiter
A
If the burner control unit cannot be reset
after a fault shutdown, although the
boiler water temperature is below
approx. 75 °C, check the following:
1. Pull the leads from thermocou-
ple A.
2. Check the continuity of the thermo-
couple with a multimeter.
3. Remove the faulty thermocouple.
4. Install a new thermocouple.
5. After commissioning, press reset but-
ton "E RESET" at the control unit.
Troubleshooting
83