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ravenheat HE 85T bolier water is blowing through auto air vent any ideas?

My ravenheat boiler is blowing water out of the Auto air vent at the top of the boiler, water is going into boiler and the boiler will not fire any ideas.
Noel, October 2011
Drain boiler replace automatic air vent when boiler loss water pressure goes less than 1 bar boiler will not work for safety reason

ltd, October 2011
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