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My boiler blows out?

When my heatin comes on the boiler blows out after30 seconds?though not with the hot water , it relights no problem ,it's an alpha combi 240 /280 model ,what can the problem be I'm freezing .
Sharon, April 2010
it sounds like a diverter valve problem,, causing it 2 overheat and discharge outside which is a safety feature on all boilers

ammo, April 2010
link Click here to see other fixes for 240.