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Worcester 24i junior boiler about 5 years old making banging noise and losing pressure thro overflow can you help.

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Its getting to hot /either your water level is low in the system /the circulating pump coupler could be broken; so water may not be circulating through the pipes, this will cause relief valve to blow ..air may be in the lines also/let me know if you need more info/good luck/joe/
what does the pressure guage read it should be reading 12lbs at the lowest an 30 at the highest/the relief valve will blow at 32 lbs this depends on how many floors or levels you have ..

Posted on Aug 26, 2010

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Posted on Jan 02, 2017

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Worcester 24i instructions


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When water is heated it expands. To deal with this all boilers are fitted with a small expansion vessel which is like a reservoir which holds the excess water.

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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I think on this one there should be a reset button [red] on the left hand top of the casing - or lower the control panel [ phillips screw on each side] and the button is on the left of the base plate. Press this and try the heating.or hot tap
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