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Mend Alpha 240x Boiler Lit 20

Alpha 240x shuts down,restarts, shuts down etc etc?

My Alpha 240x combi boiler wont stay lit for more then 20 secs then shuts down, it then relights some 15 - 20 secs later before shutting down again even under demand from the frost stat.Ive tried hot water demand only, heating demand only, both at same time with varying heat temperatures but no joy, any advice would be greatly appreciated.

Phil
February 2010
AlphaAlpha 240xHeating, Home Heating SystemsBoiler Lit 20

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Alpha 240x Boiler Keeps Shutting Down - Help!