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Why does my boiler cut out when water heater/ central heating kicks on?

I have a potterton kingfisher cf 55 boiler, which worked well until recently. Now I can have the system on, with the pilot light lit all day and there is not a problem. When I then turn on the central heating and/ or the hot water, the boiler fires up but then cuts out after a couple of minutes and the pilot light goes out. Does anyone know why this is happening please?

Kirsty
March 2009
Potterton KingfisherHeating, Home Heating SystemsBoiler Cut Water
I think it's the over heat stat or thermer stat or pump ? when your boiler fires up the hot water from the boiler is not moving so the boiler gose into lock out, check pump first.

Dave J
May 2009

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