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Potterton Suprima 30 - The central heating doesnt always com on?

I have a Potterton Suprima 30, the central heating is playing up, intermittently does not come on. Could it be the pump?
Ian, January 2010
once the boiler is switched on it fires up for a few minutes and then turns its self of again. i am also hearing a banging noise coming from the boiler i think it may be an air block

any ideas please

dave, February 2010
some times its the air presser switch

capitalboilers.co.uk, January 2010
link Click here to see other fixes for Potterton.