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.
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
Automatic Answer
We may have found other answers which could help you.
howtomendit.com for free repair help, information and advice.
