Combination boiler - hot water

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Combination boiler - hot water
8 August 2005, 9:17 AM

Karen
Joined 8 Aug 2005
1 posts

Help please - we have a worcester 240 combi rsf boiler , we have heating, but the hot water comes on for a minute (or less) and then the boiler switches itself off
any suggestions or ideas very welcome

Thanks

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Combination boiler - hot water
16 August 2005, 9:22 PM

Trevor
Joined 16 Aug 2005
9 posts

Hi Karen
Sounds like the divertor valve isnt working,its a fairly common problem with combi boilers

Trevor

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Combination boiler - hot water
4 September 2005, 0:07 AM

Meldrew's mate
Joined 19 Apr 2005
52 posts

Hi Karen, just adding to what Trevor wrote, the flow of water through the diverter valve when you open a tap causes the diverter valve to operate a switch on its end via a pin; sometime you can see this movement. Anyhow there is a rubber diaphragm inside the "large" end of the diverter valve which often perforates or splits, the symptoms get worse as the split gets larger. New diaphragms are much cheaper than new valves and remove the need to drain down the heating system, though they must still be fitted by a CORGI registered fitter.

Regards.....PJ

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Combination boiler - hot water
10 October 2005, 6:51 AM

Dane S
Joined 10 Oct 2005
3 posts

Hi,

I have a Worcester 240 and have also had problems with it.

I haven't had hot water (except in shower, heated differently) for months and now the cold weather is here I really miss it!! I recently put the central heating on and that didn't work either!! (it worked last winter). I know I'll probably have to get a Corgi registered person out to fix it but I wondered if anyone had any ideas about how much that might cost?

Many thanks,

Dane

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Combination boiler - hot water
17 October 2005, 9:55 AM

Barry
Joined 17 Oct 2005
1 posts

Hi
i have a problem with the worcester 240 combi, the CH works fine, but the DHW starts to make hammer noise after a minuite or so, the header tank (open vented system) gets filled with hot water from the boiler, i think it could be a flow issue, the pump is fine and so is the DHW switch, are their any more likely causes?
P.S system pressure is just under 1 bar.
Thanks
Barry

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Combination boiler - hot water
17 October 2005, 10:45 PM

Trevor
Joined 16 Aug 2005
9 posts

Hi Barry
It sounds like the hot water heat exchanger is blocked. You need to replace it or take it out and try to clean it with a descaler such as Sentinal Ferroquest or something equally as strong. Make sure you follow the instructions carefully. Hopefully that should solve yuor problem.

Trevor

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Combination boiler - hot water
18 October 2005, 12:48 PM

jacqui
Joined 18 Oct 2005
8 posts

could anyone help me with my 240 combi. The central heating works sometimes and when it is trying to switch on sometimes it clicks sounds electrical, continuously trying to switch on.Also half way through a bath running the water switches off and i have to reset it. the power on light is flashing constantly and the demand light is never on. I have had a new pump fitted but that has not solved the problem, my brother is also a week into de sludging it but it is still not working properly. any clues or is my baby ready for the scrapheap. chasing good money after bad. no probs till this only diaphragm a few years ago. thanks jacqui

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Combination boiler - hot water
19 October 2005, 7:32 AM

Meldrew's mate
Joined 19 Apr 2005
52 posts

To all you people out there, please don't "hi-jack" another's thread, start your own thread if you are trying to get a problem solved on your boiler.

Jackie, your's sounds like ignition problems. Does the fan start (whirring noise at the top of the boiler)?
Does the clicking noise correspond to sparking at the ignition electrode, viewed through the window with the white cover off?

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Combination boiler - hot water
19 October 2005, 10:36 AM

jacqui
Joined 18 Oct 2005
8 posts

yes the fan does sound and it does constantly click as if it wants to fire up all the time. will the power or demand lights make any difference? would this also make the water cut off or do u think there are a few different problems and do u have any idea of the cost? aggggghhhhhhhhh. thanks for that meldrews mate keep me posted

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Combination boiler - hot water
19 October 2005, 7:03 PM

Meldrew's mate
Joined 19 Apr 2005
52 posts

At this stage we seem to have established that there is a spark, but the burner is not igniting.
Please give more details about the lights, I can't see them from here so try to be unambiguous. eg you say the water is off, does that mean no water at the hot tap, or no water that is hot!!?
When we've established the fault I'll TRY to estimate the likely price, though this will depend on which area you live in (CORGI mechanics have mortgages too!).

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Combination boiler - hot water
19 October 2005, 10:31 PM

jacqui
Joined 18 Oct 2005
8 posts

no see what you dont understand is that the ch works 7 times out of 10 from the thermostat, but when the heating is on and when i turn the water on it all goes pear shaped. the ch will not turn on after the water even though the water hasnt turned itself off. i feel you need to know all about this system or else its all voodoo oooohhhhh

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Combination boiler - hot water
19 October 2005, 10:32 PM

jacqui
Joined 18 Oct 2005
8 posts

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Combination boiler - hot water
20 October 2005, 7:59 PM

Meldrew's mate
Joined 19 Apr 2005
52 posts

Jacqui, let's start with the pressure gauge. What does it read (the black needle, not the red one)? The units are in bar. Tell me if the radiators are hot, warm, or whatever at the time you read the gauge.

Next turn the heating only on, thermostat up, boiler CH temperature to midway. Over a 5 minute period turn the room thermostat up and down 10 times, each time note whether the heating successfully starts or not, then leave it on until the boiler thermostat turns it off. Note the lights, on or off? At no point let anyone turn on a hot tap during this test.
Turn the boiler off, what's the pressure now?

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Combination boiler - hot water
20 October 2005, 9:15 PM

jacqui
Joined 18 Oct 2005
8 posts

the bar is one and a half, tried turning on and off and each time its working, when the rads warm up the bar goes up to nearly 2. the thing is that it is unpredictable,sometimes it will work and sometimes it wont tonite each time it works, but you can bet your bottom dollar that when its freezing cold the bugger wont work you know what i mean!!!!. But each and every time you have the water on it switches off halfway through a bath, the water is more predictable you just know that this is gonna happen. and each time it does. its all very strange, maybe one problem needs solving b4 the other. what do u think? thanks jacqui

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Combination boiler - hot water
20 October 2005, 9:17 PM

jacqui
Joined 18 Oct 2005
8 posts

soz forgot to tell you the lights for the power is constantly flashing all the time and the demand light never works. thanks jacqui

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Combination boiler - hot water
21 October 2005, 8:08 AM

Meldrew's mate
Joined 19 Apr 2005
52 posts

So to recap, heating often works, sometimes doesn't, hot water always "switches off" halfway through a bath (I'll assume someway into a bath the hot water goes cold). The demand light never comes on. The mains light flickers constantly.

Don't worry about the mains light, it's a neon and they often flicker, only if it goes off for more than a couple of seconds should you suspect a supply problem.

The demand light not coming on leads me to believe your diverter valve is at fault, maybe it's repairable, maybe not as your symptoms of regular tripping out after running hot water steer me towards thinking the valve is sticking between hot water duty and heating duty intermittantly. This leads to internal overheating of the boiler and subsequent tripping, needing to be reset (by you).

Pls confirm the assumed symptoms are (substantially) correct.

On this basis you must repair/change the diverter valve.
There is also the distinct possibility that your heating system is severely sludged, needing chemical cleaning.

As for cost? Which area / town do you live in?
What is the GC no. of the boiler? This is on the data plate behind the lift-off white front and is preceeded by "G20"

We may have to talk on the phone about this but I'm reluctant to put mine up in public, do you have a hotmail or other account I can send it to for the purposes of talking you through this? I'll be away from the PC from tonight for a couple of days.

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Combination boiler - hot water
22 October 2005, 12:24 PM

jacqui
Joined 18 Oct 2005
8 posts

hi its me. My brother has just been down to empty down the system as he de sludged it a fortnight ago, he has put an inhibitor in it. he said it did not seem to be really dirty when he emptied it. thge number you wanted is 4731112. When he had finished we tried the heating and that was ok, but we then tried to run a bath and lo and behold the bath was halfway through and off it went. The thing is my brother is a trainee plumber and not fully qualified with boilers yet although its all hit and miss with them anyway!!!! hoping that you can help me again as all is not well, i probably do need to speak to you my e mail is [Log in to view email] you please leave your number and i will contact you thanks meldrews mate, by the way we are in lancs near southport.

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Combination boiler - hot water
22 October 2005, 2:02 PM

Edited by Meldrew's mate 22 October 2005, 3:33 PM

Meldrew's mate
Joined 19 Apr 2005
52 posts

Phone no sent to your email.

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Combination boiler - hot water
30 October 2005, 3:30 PM

murph
Joined 30 Oct 2005
2 posts

hi could any one please tel l me what the pressure is meant to be on the gauge ?mine is below 1 but the heating and water ok.am i meant to fill the tank up?

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Combination boiler - hot water
30 October 2005, 10:11 PM

Meldrew's mate
Joined 19 Apr 2005
52 posts

It depends how many floor you have, and on which floor the boiler is. You only need to have enough pressure to maintain a positive pressure at the highest point in the system.

So for a typical boiler on ground floor, two storey house, the pressure should be 0.5 bar minimum, so 1 bar is perfectly adequate.

Don't confuse heating system pressure with domestic hot water pressure - they are not the same and upping the heating pressure will not improve the hot water one iota!

If it ain't broke.......etc.

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