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Worcester Bosch 24CDi Combi Boiler - fault is that if mains power is supplied to the boiler, the CH is on - even with thermostat right down, CH control knob to 'summer', and timer off. Thermostat tested OK. PCB checked - no water damage, several apparent dry joints resoldered, no change. DHW operates normally, and does divert HW flow from CH when a tap is opened.

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Diverter valve may not be seating on ch side letting water to pass.

Posted on Sep 20, 2017

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Posted on Jan 02, 2017

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SOURCE: combi boiler no DHW

if the boiler fires when the tap is opened then the diverter valve is working ok it must be a blocked plate heat exchanger which is the stainless steel rectangular block inside the boiler connected to the pump and the mains cold water.
it will be blocked on the central heating part probably with black scale. it is possible to clean out but sometimes it is better to just change the plate. but remember to flush the system as well or the same thing will happen.

Posted on Mar 30, 2009

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My central heating turns off when i turn the hot water tap on. when i turn it off the central heating doesn't come back back on until i turn the power off and on.


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Feb 09, 2016 | Water Water Heaters

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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!

Nov 07, 2014 | Water Heaters

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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

1 Answer

Boiler Programmer user manual


contat worcester bosch they will be happy to send you a manual as you already have there product installed.

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The water pressure on my Greenstar 25Si Worcester Bosch combi boiler is so low that the shower won`t heat up. Can someone please tell me how to increaese the water pressure as there doesn`t seem to be an...


The boiler has a filling connection which uses a filling loop to connect the boiler to the mains supply for the initial fill and subsequent fills.
See the link below from the manual you can buy the filling loop connection online or ebay its a simple task to replenish the pressure. Worcester GREENSTAR 25Si Instruction Manual Filling The System

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