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Tried running the boiler with front cover off seemed to work fine ,when the cover was replaced after a while it started to pulse again,so I will get the flue seen to as soon as possible as you suggested.Thanks to you and Spraggo for your prompt reply and good advice. :P

Hi, I,m new to the forum, I have a Boulter Economy oil boiler with a Riello burner .The boiler fires up no problem and runs fine for approx 3/4 of an hour but then begins to pulsate and eventually stops completely.Can anyone shed some light on this problem.