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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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Posted on Jan 02, 2017

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Check the filling loop is turned off.
Does the water pressure rise from cold to hot, if so the expansion vessel has gone.

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Pressure inside the tank will rise along with the water temperature. As the water inside cools the pressure will wane until the heating element turns on and reheats the water with a subsequent rise in pressure. Running the hot water at the same time will draw heat energy from the boiler and lower the internal temp and pressure as well.

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Worcester 35cdi overflow problem


if by overflow pipe you mean pressure relief valve either your expansion tank is full and needs to be drained if that type or replaced if bladder type. but if 1.5 bar is normal pres reading then the pressure relief valve is bad (it is a wear item )

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My worcester bosch 24i junior pressure keeps dropping if i have heating off for an hour i have to top up boiler and reset also when i have heating on the pressure jumps right up to over 4.0bar


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.

The problem is your expansion vessel - normally a little red painted metal cylinder inside the boiler.

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I have a worcester 28cdi combi boiler. The pressure keeps going up yo 3 bar when the heating is on, and venting of via the pressure valve. When the boiler cools down the pressure drops to zero, and I have...


Your boiler has an expansion vessel that is like a bladder full of air. Yours has lost it's air pressure. Check your manual for this vessel and where the valve is to re-inflate it and what pressure to inflate to. It should have a simple tyre valve, pump it back up (usually to about 1 bar after releasing the water pressure) and should be all fixed. If you can't re-inflate the bladder is holed and the expansion vessel will need replacing.

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Worcester 24i combi when in shower hot water flicks on and off can hear gas igniting and extinguishing


This is lack of water flow through the diverter valve.

First have you got a good flow from any cold tap? If yes then see below

If I remember there is a pipe carrying cold mains crossing the lower front of the boiler with an in line filter usually clogged. Remove clean & replace
check also any filter in rising mains to boiler

another cause is the diverter valve itself - diaphram inside may be punctured/split

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Repressurizing my boiler


take your pick from video or text

How to Repressurise a Heating System with an Internal Filling Key ...

? 3:30
https://www.youtube.com/watch?v=zUsBw1ZpiKY
Oct 27, 2010 - Uploaded by Worcester, Bosch Group
This video shows you how to repressurise your heating system using your Greenstar gas boiler's internal ...

Repressurise Worcester boiler - YouTube

? 4:12
https://www.youtube.com/watch?v=K6fH4XfGgxo Nov 10, 2012 - Uploaded by Rory Macfarlane
This video demonstrates how to repressurise a Worcester combi boiler on the.

Product Troubleshooting Videos ' Worcester, Bosch Group

https://www.worcester-bosch.co.uk > Support > Troubleshooting > Videos How to repressurise a heating system with an internal filling key ... how to repressurise your heating system using your Greenstar gas boiler's internal filling key.

How to top your Worcester combi boiler up - Gas Care.

www.gascare-heating.co.uk/topping-pressure-worcester-bosch-combination-boiler/ Aug 4, 2014 - If the needle on the pressure gauge on your boiler has gone into the red or down to zero it means there is little or no pressure left in the heating system and it needs to be topped up ASAP. So here's Gas Care Swansea's guide to refilling your Worcester Bosch combination boiler through the internal filling link.

How do I re-pressurise my Worcester Bosch boiler? - My Plumber

www.my-plumber.co.uk/blog/how-do-i-re-pressurise-my-worcester-bosch-boiler/ Sep 1, 2015 - 6) Check the pressure on the pressure gauge. When it reaches between 1 and 1.5 bar, it is time to turn the white knob back to the right to close the valve. Be very careful not to over-tighten. 7) Turn the filling key to the left until the arrow lines up with the open padlock and remove the key.
Repressurise Worcester boiler

May 12, 2017 | Heating & Cooling

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