Viessmann VITOLADENS 300-W Installation And Service Instructions Manual page 108

Troubleshooting
Repair
(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.
90 °C, carry out the following checks:
A
1. Pull the leads from temperature lim-
iter A.
2. Check the continuity of the tempera-
ture limiter with a multimeter.
3. Remove the faulty temperature lim-
iter.
108
4. Install a new temperature limiter.
5. After commissioning, press reset but-
ton R on the control unit.