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Central Heating pressure loss

 
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bob888



Joined: 12 Mar 2008
Posts: 4
Location: herts
PostPosted: Wed Mar 12, 2008 11:42 pm    Post subject: Central Heating pressure loss Reply with quote
hi first post !

Needs help. In the last week i am having to top up the pressure on central heating system every other day.

Each time i top it up to 1.5bar, its ok for a day or so then drops to zero. The hot water and radiators work fine for 1-2 days, then boiler locks out.

I have sealed system, with a keston celsius 25 boiler and a Megaflo heatrsadia tank.

I have bled the radiators and had the boiler serviced in Feb 08.

Can anyone help please ?
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Yellowman



Joined: 03 Jan 2008
Posts: 66
Location: Sussex
PostPosted: Wed Mar 12, 2008 11:48 pm    Post subject: Reply with quote
Have you checked the Pressure Relief Valve which is from the boiler and terminates on the outside wall?

Tie a baloon over it and see if it collects any water. I presume you have no sign of a leak anywhere?
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bob888



Joined: 12 Mar 2008
Posts: 4
Location: herts
PostPosted: Thu Mar 13, 2008 9:14 am    Post subject: Reply with quote
i have checked the airing cupboard where the tank is, no signs of water leakage.

I have two pipes that come out onto the ext wall, one i believe is the boiler flue, is the other the pressure relief valve ?
i also have an overflow pipe from the megaflo which goes out to ext wall, buts thats dry.
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thescruff
Moderator


Joined: 03 May 2003
Posts: 4418
Location: Bath
PostPosted: Thu Mar 13, 2008 9:29 am    Post subject: Reply with quote
Forget the megaflow for a minute, its unlikely to be the problem.

Top the pressure up then turn the boiler, what does the pressure gauge do, and is any water dripping out the pressure relief pipe
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bob888



Joined: 12 Mar 2008
Posts: 4
Location: herts
PostPosted: Thu Mar 13, 2008 12:41 pm    Post subject: Reply with quote
pressure topped up to 1 bar. when the boiler is turned on, the pressure gauge slowly rises to just below 2 bar then remains there. I have noticed little drips from one of the external pipes, only occassional not constant dripping.
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Yellowman



Joined: 03 Jan 2008
Posts: 66
Location: Sussex
PostPosted: Thu Mar 13, 2008 4:35 pm    Post subject: Reply with quote
That sounds like it could be your pressure relief valve. Its a small 15mm copper pipe. If it is dripping constantly that can be enough to dump the pressure out of the boiler.
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