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Flashing red light under ! on my worcester 24i junior combi boiler and pressure under 1

Ok well i ran out of gas so i went and put some gas on card, put it on meter and turned gas on, but now i have a red light flashing under a ! symbol and the pressure is under 1, please may you help as less complicated as you can thanks :)

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  • Ned C Cook
    Ned C Cook May 11, 2010

    ok, what are we talking about? You ran out of gas on what?What is this card and how is this transfered?and to what is it transfered? What state are you located?

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You don't have enough pressure in the tank you are using, needs to be a 2lb system to work properly it is starving the gas valve for gas

Posted on Jun 04, 2009

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Thanks for that mike, it is a worcester bosch combi 24cdi heating and water can stay on for an hour then everything goes off and the red light flashes. it will come straight back on when reset, but then...


Check the pressure reading, should be about 1 bar when system is cold. Various models in the range of 24cdi. If you do not have a manual, go to,
http://www.centralheating.co.uk/Boiler-Manuals/worcester-bosch-boiler-manuals/worcester-bosch-discontinued-boiler-manuals.
Get the manual for your unit, to wards the end of install manual it has a fault finder, Also has a basic 1 in the user manual. Number of flashes how fast the light flashes which one flashing can all mean different, So get the manual and check, Some parts are easy to fix, as long as you do not touch the gas side the rest is plumbing. Come back if needed.

Mar 05, 2013 | Water Heaters

2 Answers

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.

Dec 22, 2010 | Bosch Water Heaters

1 Answer

How do i refill ny worcester junior 24i combi boiler? as i cannot get the pilot light to light


Two types dependent on age
Early - in the mains water inlet pipe there should be a service valve/tap which when turned on will refill [it is close to or part of the fill loop - a metal braided flexible pipe
Later - underneath there is a hole for a plastic tap [supplied with boiler] to be inserted [usually just right of center] Insert and turn 90 degrees then close to it another small knob or 2nd tap which when turned [same action as a basin tap] will refill. If the first tap is not inserted properly water will drip out past its seals
For both Refill to about 1.5 - 2 bar and turn off
For the later as above but also remove the 1st tap

Mar 14, 2010 | Water Heaters

3 Answers

My boiler is not working, not heat, no hot water, red alert light flashing? I dont know how to reset the boiler or het it going again. Its a Worcester 24i junior. Help! Im very cold!


your condensation pipe may be frozen get a hairdryer on it or a hot kettle that should sort it thats the whit pipe on the left usualy plastic

Nov 13, 2009 | Water Heaters

1 Answer

Flashing red light on Worcester 24i junior combi boiler


Pressure is ok? at 1 bar or above
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
P.S. if you're on a prepayment meter check you have gas.

Nov 08, 2009 | Water Heaters

1 Answer

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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2 Answers

Hi where can i find a manual for a worchester greenstar 24i junior boiler please


if you go on the worcester bosch web site and contact the service dept they should send one out to you or you may be able to download one from there.

Mar 27, 2009 | Water Heaters

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