Combi Boiler Pressure

9 Nov 2004
Reaction score
United Kingdom
I have a baxi 105e combi boiler and the water pressure is constantly increasing until it hits 3 bar and the relief valve kicks in. I have disconnected the filling loop but it still increases in pressure. I have to manually release the pressure every day. Pressure rises even when system is turned off!! Please help! Thanks.
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Hello mate, in the manual i can see a heat exchanger and a plate heat exchanger! Which is the secondary one???? Thanks.
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Thanks for your help guys i will get this sorted. I was told it may have been the expansion vessel, glad i havent bought one yet! Cheers.
Just a quick thanx to kev, boiler has had new secondary heat exchanger and is now running sweet. Cheers m8. :p

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