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Subject Topic: Combi boiler question Post Reply Post New Topic
Message posted by fran100016/11/2013 at 12:48pm
Outfit:  None Entered     Location:  East Sussex
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Anyone have any idea why the pressure on my boiler keeps dropping? I'm having to top the system up two or three times a day atm.

I've bled the radiators and there's no signs of a leak anywhere.

Any advice much appreciated.

Message posted by pnefan16/11/2013 at 1:11pm
Outfit:  Autosleeper Symbol     Location:  Preston
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Its a sealed pressurised system so shouldn't be losing pressure. Leak could be hidden some where. Are there sgns of the safety valve blowing? Either way think you need a heating engineer.

Message posted by magnolia16/11/2013 at 1:18pm
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You could still have a leak and it is evaporating before you can see it. Have a look when the heating is turned off and that should show you where it is.

Could also be a 'thingie' inside the boiler itself. Do you have an expansion pipe to the outside? If that is dripping then it could be the seal to that and you will need a heating blokie to sort it.

Message posted by daveyjp16/11/2013 at 2:30pm
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There is a pressure vessel inside the boiler which can lose pressure. A gas engineer can repressurise.

Whilst you say you don't have a leak, check all radiators carefully. Ours was losing over about a week, turns out when it was fitted the main nut on the towel warmer in the bathroom was slightly loose. Tightened it and it has been fine.

Message posted by Bramston16/11/2013 at 6:11pm
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The heat exchanger inside the boiler can corrode through allowing "sealed" central heating water to escape into the hot tap water supply.
I had to get a new boiler, the new ones don't have pilot lights and so use less gas when nothing is running.

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Message posted by macquatic16/11/2013 at 6:51pm
Outfit:  Hyundai Santa Fe & Pegasus Rimini     Location:  Inverness
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My boiler was doing the exact same, losing pressure very quickly.
Traced it to the expansion vessel, tested pressure, it was very low, and used a bicycle pump to re-pressurise to 1 bar.
Been fine since and that's over 3 years now!
HERE'S A LINK on how to check the vessel.

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Message posted by Burrellboy18/11/2013 at 5:31pm
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There is, of course, the possibility of a leak elsewhere on the system than the radiators, such as hidden pipework under flooring etc.

Pete.

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Message posted by ShaunNR18/11/2013 at 7:09pm
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Hey,
I doubt the Expansion vessel is causing the loss of pressure like your describing.

Take a look outside and see if you have a pipe leading through the wall from the boiler. Is it dripping? If so its your PRSOV leaking. This is the valve that is designed to reduce pressure. A leaking PRSOV is a very common problem on combi boilers due to them sticking open. It's very cheap and easy to fix.

Cheers,
Shaun.

Message posted by Miserly18/11/2013 at 9:33pm
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In regards to the last post,if the expansion vessel has lost it's integrity,then system pressure increases as it heats up,causing a loss of water through the pressure relief valve. Then,as the system cools,you will have a lack of pressure. A leaking heat exchanger or diverting valve causes the opposite problem, a rise in pressure will show as a constant drip from the safety. Pumping up the expansion vessel may work,but may only be a temporary fix,and a new one may be needed. An external one may be easier and cheaper,and on bigger systems,work better.

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Message posted by ShaunNR18/11/2013 at 10:11pm
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If you've got a pressure gauge keep an eye on it. Most PRSOV's will let water past at 3 Bar. If when your central heating is running it goes up and beyond 3 Bar then yer its probably your expansion vessel.

Look at it logically before replacing parts willy nilly like most plumbers i have had round. Why go for a more expensive fix first when it could be a 10 quid valve?

I've been through this all before with my 15 year old boiler which now works reliably. And yes i fixed it myself. Every plumber who looked at it was useless. Chastise me if you want (But its falling on deaf ears) but i don't touch gas.

Cheers,
Shaun.




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Message posted by aahbarnes19/11/2013 at 10:31am
Outfit:  Sunncamp 350se 2009.     Location:  Wirral
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Quote: Originally posted by ShaunNR on 18/11/2013
Hey,
I doubt the Expansion vessel is causing the loss of pressure like your describing.






Dodgy expansion vessel can easily cause these symptoms.



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