Checking The Temperature Limiter - Viessmann Vitoladens 300-W Installation And Service Instructions Manual

Maintenance
(cont.)
20
10
8
6
4
2
1
0.8
0.6
0.4
10 30 50 70 90 110
Temperature in °C
Fig. 50 Sensor type: NTC 10 k

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, check the following:
A
Fig. 51
1. Disconnect the leads from temperature limiter
2. Check the continuity of the temperature limiter with
a multimeter.
3. Remove faulty temperature limiter.
Ω
.
A
3. In the event of severe deviation replace the sensor.
4. Install a new temperature limiter.
5. After commissioning, press reset button R on the
control unit.
Troubleshooting
77