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I have a worcester 28cdi boiler and the pressure keeps rising..

I have a worcester 28cdi boiler and the pressure rises to max 4 bar i have put a new loop on it but the pressure still keeps rising to max,i have bled the radiaters as well...can you help ..

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  • Anonymous Mar 15, 2014

    when running hot water the radiators start getting hot when built in timer is on off

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You bled the radiators, so this is a water system not steam. Sounds like you expansion tank is "slugged" or full of water, so there is no place for the water to expand when it warms up. get some water out of the expansion tank

Posted on Aug 03, 2009

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This expansion vessel is like a balloon in a metal pot. When the water goes in the metal pot the baloon squashes a bit to make room for the extra volume of water. When it cools the balloon pushes the water back into the heating system.

What has happened is your expansion vessel no longer works. When the water heats up there is nowhere for it to go so the pressure jumps up to 4 bar. The Worcester boiler lets high pressure water escape (most boiler allow this to go through the safety valve at say 3.5 bar).

When the water cools the pressure drops very low as the volume of water contracts.

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