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Worscester 24i boiler

No heating or hot water gas wont ignite lost water pressure now refilled but seems to be airlocked anyone know how to vent boiler

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  • blue236 Feb 19, 2009

    it should have an auto air vent that does itself i think other way to do it is see if rads have air. hope this is of help

  • Rod Davies May 11, 2010

    The manual vent [automatic pressure relief valve] is inside the casing usually a large red knob which can be turned by hand situate at the lower right - You should have a pipe which goes through the outside wall from it This vents and will empty the whole system inc rads
    The auto vent is usually close to the water pump and has a small red/black knob [short biro top size] this should be open by 1 turn from closed This vents the air from the boiler only, automatically when in use
    Lost pressure = leak maybe through manual vent - have a look outside where the vent pipe goes through the wall
    If your pressure is about 1 bar then its something else Does the fan [on top of boiler and at start of the 110mm vent pipe] work. This should come on when there is any demand from boiler even if it does not fire up



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There is sometimes a large screw on the front of the of the pump un screw a bit and see is air comes out

Posted on Apr 06, 2010


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Posted on Jan 02, 2017


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Hi I have a 24i worcester boiler I have drained the heating to do some work but I need the hot water to still work.I spoke to Bosch and they said I need to put a loop in.I am not a plumber but can get

Hi Steve, I am not a plumber but have done a lot of DIY on my own heating system with Worcester Bosch combi boiler! I believe that you can have the hot water on without the heating system filled, just turn all the settings as for summer use and the thermostat right down so the heating is forced to stay off!

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Hello, I have a Worcester 24i boiler and the heating is working fine but the hot water will only stay hot for about a minute at a time in the kitchen sink, the shower is ok but only when the heating is on....
The link is to how to flush a tankless system.
This should be done once a year.
This link is to the manual on the unit.
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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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This is lack of water flow through the diverter valve.

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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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