Viessmann Vitodens 200 Service Instructions Manual page 82

Type wb2a, 8.8 to 20.0 kw wall mounted gas fired condensing boiler natural gas and lpg version

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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. 75 °C, check the following:

1. Pull the leads from thermocouple

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

button "E" at the control unit.

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