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Vaillant VCW-Sine18 T3WFH Lights but then goes off after 5 Min?

My boiler lights easily but after 5 minutes there is a click and then it goes off and the pilot goes out.
Martin, January 2019
Blocked pilot or a new thermocouple would be the obvious answer.
If the pilot is weak, it can be dragged away from the thermocouple by the main flame

Carefree, June 2019
link Click here to see other fixes for Vaillant.