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how can i fix my vokera combi compact boiler?

my boiler is self topping up to 4 in the red and is losing water out of it,s overflow but is still working.do you know how to solve this problem.
alick bird, April 2009
yeah sounds to me as u might need a new heat exchanger,

hudds gas man, April 2009
If the boiler filling loop is definitely closed - and you are sure of this - it usually means that water is escaping from the domestic water heat exchanger into the central heating one, unfortunately.

John, April 2009
link Click here to see other fixes for Vokera.