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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 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 by can anyone tell me if there is an easy way round this or can I just leave rad valves shut and that would work. THanks

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  • 216 Answers

NO!!! DO YOU HAVE A MONOFLOW ONE PIPE WITH 2 TEES, OR A SINGLE PIPE LOOP GOING IN AND OUT, OR 2 PIPE SUPPLY AND RETUUN SYSTEM ? ZONE VALVES OR SEPERATE CIRCULATORS ? EATHER WAY BOILER WATER NEEDS TO CIRCULATE FROM SUPPLY TO RETURN. JUST FINISH WHAT YOU STARTED.

Posted on Nov 10, 2014

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Posted on Jan 02, 2017

  • 1 Answer

SOURCE: Worcester combi boiler losing pressure & water through o/flow

having the same problem and its a new bolier. thanks , adriano.

Posted on Jul 12, 2009

  • 150 Answers

SOURCE: 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.

Posted on Nov 08, 2009

Testimonial: "Thank you, very helpful advice. Still got the plumber coming to check everything over but the boiler is up and running for now. Thank you so much"

  • 1 Answer

SOURCE: My boiler is not working, not heat, no hot water,

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

Posted on Jan 09, 2010

  • 2 Answers

SOURCE: Worcester Bosch Highflow 400 Boiler - no hot water or heating

Normal 0 false false false MicrosoftInternetExplorer4 /* Style Definitions */ table.MsoNormalTable {mso-style-name:"Table Normal"; mso-tstyle-rowband-size:0; mso-tstyle-colband-size:0; mso-style-noshow:yes; mso-style-parent:""; mso-padding-alt:0cm 5.4pt 0cm 5.4pt; mso-para-margin:0cm; mso-para-margin-bottom:.0001pt; mso-pagination:widow-orphan; font-size:10.0pt; font-family:"Times New Roman"; mso-ansi-language:#0400; mso-fareast-language:#0400; mso-bidi-language:#0400;} Hi, this is Worcester, Bosch Group

Although we don't currently offer live technical support online, our Technical Support department will be able to help. Their number is 0844 892 3366 - they're open 6 days a week and on average answer calls within 20 second. If you want to know more about our Technical Support department visit our website

http://www.worcester-bosch.co.uk/homeowner/customer-service/customer-technical-support

We look forward to helping you

Posted on May 17, 2010

  • 349 Answers

SOURCE: worcester 24i combi boiler loseing water from

http://www.plumbnation.co.uk/site/worcester-greenstar-junior-24i-combi-boiler-natural-gas/

Annie, I don't have experience in this boiler , but I found a link that has some information and numbers to get help. Thought I would pass it on and hope it will be helpful.

Posted on Jun 09, 2010

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1 Answer

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!

Nov 07, 2014 | Water Heaters

1 Answer

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

Worcester Bosch Highflow 400 Boiler - no hot water or heating


Normal 0 false false false MicrosoftInternetExplorer4 /* Style Definitions */ table.MsoNormalTable {mso-style-name:"Table Normal"; mso-tstyle-rowband-size:0; mso-tstyle-colband-size:0; mso-style-noshow:yes; mso-style-parent:""; mso-padding-alt:0cm 5.4pt 0cm 5.4pt; mso-para-margin:0cm; mso-para-margin-bottom:.0001pt; mso-pagination:widow-orphan; font-size:10.0pt; font-family:"Times New Roman"; mso-ansi-language:#0400; mso-fareast-language:#0400; mso-bidi-language:#0400;} Hi, this is Worcester, Bosch Group

Although we don't currently offer live technical support online, our Technical Support department will be able to help. Their number is 0844 892 3366 - they're open 6 days a week and on average answer calls within 20 second. If you want to know more about our Technical Support department visit our website

http://www.worcester-bosch.co.uk/homeowner/customer-service/customer-technical-support

We look forward to helping you

May 13, 2010 | Bosch 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

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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