Sounds like Oil pressure, the Hydrolic ram is operated from the high pressure side of the pump, if the ram is staying open, then i would look at replcing the pump and ram ( ram is about £17.00 + VAT.
Also consider blocked Nozzel filter etc.
if the flame snuffs out once lit, it is normaly an oil issue, if the boiler locks out when there is a good strong flame, then consider photo cell ( well not in this case, its all part of the control box) .
Phil
March 2009
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