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baxi combi boiler 105e high pressure problem?

this boiler is gaining pressure from 0.5 to 3 bar in about 24 hrs my expansion vessel was full of water so i thought this was the problem but i have changed it for a new replacement but the pressure problem is still their can any one advice
ian everard, October 2008
loseing pressure water leaking put up the pressure then by the next day the pressure has droped again the water leaking again

rav, February 2011
Firstly check filler loop is not passing water into system.(disconnect fill loop).if everything ok with fill loop.
Possible pinhole within plate heat exchanger

Grahame, October 2008
link Click here to see other fixes for Baxi 105E.