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hox can i fix my baxi combo instant 105e?

My combi boiler regularly loses pressure (down to zero in a week). Also, at times, when the pump is running, it sounds like a jet engine taking off, but at other times is perfectly quiet running.
John, March 2008
Mine has the same problem, down to zero within 4 days. Been told new expansion vessel needed as water comes out of the vessel when attempting to pump it up to 1 bar pressure.

Tim, April 2008
the pump prob makes a noise when your low on pressure .. check for leaks on the system and check the relief pipe outside for water dripping out of it

matt the boiler man, March 2008
link Click here to see other fixes for Baxi 105E.