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Potterton Prima 40 B Boiler pilot light fails to stay on ?

I need to keep this boiler going until I raise enough cash for replacment, once I try to start the pilot light it will not stay on when turned from spark to flame setting.
The spark electrode works and the flame only stays on so long as I have the button pressed in ?
Adnan Ashraf, January 2008
Thank you Matt, did as you advised, the boilers working fine now.

Adnan Ashraf, January 2008
you need a new thermocouple get a universal one usualy sold in most plumbing and gas stockists

matt, January 2008
link Click here to see other fixes for Potterton Prima.