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pilot light won't stay lit?

Vaillant VC GB 221 H
The pilot light will light as normal when button depressed but will not stay lit when button released no matter how long you hold it for
Paul, January 2011
In order:
Pilot light not strong enough:
Thermocouple faulty:
CH limit stat faulty:
(Depending if the thermocouple links to the CH limit stat some do, some don't)
Gas valve faulty:

Carefree, January 2011
link Click here to see other fixes for Vaillant.