baxi combi 105e

20 Oct 2011
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United Kingdom
when I have this boiler on central heating,the pressure gauge goes up to over 3 bar,the pressure relief valve kicks in and discharges water through the pipe,can anyone tell me what the problem is? what is causing the pressure to rise?
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thanks for that reply namsag,checked pressure in expansion vessel,seems to have the correct pressure 0.5 bar,any other idea's,thanks
Filling loop letting may be letting by.

Holed plate to plate a possibility.

Communication tube could be blocked.

The pressure you stated does sound low though.
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thanks misterdubya,but what is a communication tube,I had a problem like this 4 years ago and it was the plate heat exchanger,

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