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Old 18-02-2010, 14:07
Carmen Queasy
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We have to constantly re-pressurise our boiler. It's been like this since we moved in.

It's been confirmed there are no leaks anywhere. We believe there is no air in the heating system (all radiators have been bled, for example).

The boiler is in the bathroom. We have a non-power shower but the shower is very powerful. I assume this is because the boiler is on the same level as the shower (it's about 2 meters away, in fact).

It's a combi boiler and there's no separate tank for the shower.

Now, my theory is that the shower is too powerful and it's draining the pressure? Is this possible?

The pressure doesn't instantly change. It's gradual which is why we though there's a leak but there's nothing.

We have British Gas Home Care, so we can get someone out to look at it, but it might be pointless if there's nothing anyone can do.
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Old 18-02-2010, 14:18
chrisjm
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if its a combi, i think the shower and heating is isolated from each other. so the shower shouldnt be causing the heating to lose pressure.
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Old 18-02-2010, 14:21
simon40
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Who confirmed there were no leaks?

IOf you are with British Gas get them out and they will sort it out for you. Maybe the person who tested it for you did not look too hard.
Losing pressure means it is leaking somewhere.

We had this problem a few years ago and tghe engineer replaced a red pressure thingy in the boiler )sorry don't know technical name, maybe pressure vessel) and it cured the problem.
I would have thought the shower would not cause you a loss of pressure as it is a different system.

Seacom is the guy who knows about Central Heating systems as he is in the trade - i'm sure he will be along later to answer your question more thoroughly.
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Old 18-02-2010, 14:37
Carmen Queasy
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There was a leaking tap when we moved in, but it was just the washer which needed replacing. That's solved now.

So, taps etc are on a separate supply to the heating? There really is no evidence of a leak anywhere. We never lifted the floor boards up to check the pipes, but there's no water marks to be seen anywhere.

We do, however, keep the, erm... bendy pipe... which allows us to fill the boiler up attached at all times. The valves are closed off, of course.
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Old 18-02-2010, 14:57
seacam
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We have to constantly re-pressurise our boiler. It's been like this since we moved in.

It's been confirmed there are no leaks anywhere. We believe there is no air in the heating system (all radiators have been bled, for example).

The boiler is in the bathroom. We have a non-power shower but the shower is very powerful. I assume this is because the boiler is on the same level as the shower (it's about 2 meters away, in fact).

It's a combi boiler and there's no separate tank for the shower.

Now, my theory is that the shower is too powerful and it's draining the pressure? Is this possible?

The pressure doesn't instantly change. It's gradual which is why we though there's a leak but there's nothing.

We have British Gas Home Care, so we can get someone out to look at it, but it might be pointless if there's nothing anyone can do.
Hello Carmen,

No I'm afraid.

What make and model of boiler?

It could be something simple like a faulty pressure gauge or you have a slow leak, the very worst kind to pin point.

Check bleed nipples and all rad' valves nuts and joints with the system off and cold, check around these areas with tissue paper, check for wet spots.

You write" instantly change" what does that mean, do you mean one moment gauge is at 1.5 bar and then suddenly it drops to near 0 or that it is a slow decrease.

Either of the above, have you had the PRV checked/replaced or checked the PRV pipe.

Go out side a look for a small copper pipe/elbow coming out of the wall, is it dripping? you may have to observe it over a few days, can you put a bowl under it or bag over it if on the ground floor for a day or so, don't forget to remove the bag, IMPORTANT THAT.

If pipe is not dripping, do you have any buried heating pipes?
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Old 18-02-2010, 15:06
seacam
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There was a leaking tap when we moved in, but it was just the washer which needed replacing. That's solved now.

So, taps etc are on a separate supply to the heating? There really is no evidence of a leak anywhere. We never lifted the floor boards up to check the pipes, but there's no water marks to be seen anywhere.

We do, however, keep the, erm... bendy pipe... which allows us to fill the boiler up attached at all times. The valves are closed off, of course.
Hi Carmen,

Disconnect the the filling loop, one end, now observe your pressure for the next few days.

In any event you should not have your filling loop connected at all, ( under the regs), but if you must, one end only.

No water marks!, Sorry I thought you had checked for leaks. , no floor boards lifted you say.

Ok, observe or do as advised in my last thread, disconnect your filling loop in the first instance, do things improve or are you still losing pressure?
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Old 18-02-2010, 15:28
Sigurd
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If the central heating pipes run under the floor, then it's quite possible that's where the leak is.

Some years ago I had a similar problem with a combi boiler losing pressure, and after a lot of crawling around under the floor (where there wasn't much room at all!) I eventually found one soldered joint in the central heating pipework that was dripping, and when I touched it quite gently it just fell apart.
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Old 18-02-2010, 15:31
Carmen Queasy
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Cheers Seacam!

When I said instantly, I meant there isn't a sudden drop. It's gradual. I guess it makes sense that there's a slow leak somewhere.

The pipes upstairs are under the floorboards and we are unable to lift those. Well, we could but it'd be a lot of work. What I meant is that there's no sign of water on the ceilings downstairs.

I'll check the thing outside. If this is dripping what does that actually mean?

Nothing has been altered on the boiler. British Gas said the boiler was in good working order.

It's a Potterton Promax Combi HE Plus.

I'll try removing the filling loop. The valves at both ends are closed but I'll try this first.

Thanks again!
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Old 18-02-2010, 16:04
seacam
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Cheers Seacam!

When I said instantly, I meant there isn't a sudden drop. It's gradual. I guess it makes sense that there's a slow leak somewhere.

The pipes upstairs are under the floorboards and we are unable to lift those. Well, we could but it'd be a lot of work. What I meant is that there's no sign of water on the ceilings downstairs.

I'll check the thing outside. If this is dripping what does that actually mean?

Nothing has been altered on the boiler. British Gas said the boiler was in good working order.

It's a Potterton Promax Combi HE Plus.

I'll try removing the filling loop. The valves at both ends are closed but I'll try this first.

Thanks again!
Sorry Carmen, I apologies, ( watermarks ), of course on the ceiling, I had it in my head you were in a ground floor flat, sorry.

Ok one step at a time, first disconnect the filling loop with valves off,----observe.

At the same time is the PRV pipe out side dripping water, I accept maybe a little hard to observe,----and it is raining.

You may have activated the PRV if you have over pressurized the system------you could have done this if the filling loop is left in place and doesn't shut properly, ( hence the regs and advise ).

Now in practice once the pressure has been released the PRV, ( pressure release valve ), should reseal its self and the PRV pipe stops dripping.

That's in practice but a lot of times the valve gets stuck and needs to be replaced.

It is however more then likely you have a slow leak in the system.

But you could also have a problem with the combi expansion vessel discharging which would also allow the PRV pipe to drip or pour but we are no where near that yet on checks.
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Old 18-02-2010, 17:18
stickler
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My money would be on the expansion vessel (the red thingy someone mentioned up there) ^^^

We managed with a faulty one for months by keep topping up the pressure.
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Old 18-02-2010, 17:32
Carmen Queasy
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The heating is on and nothing has changed in regards to the pressure. It's operating at around 1.5 bars, which, on the boiler, says is fine.

I think it's when the heating goes off the pressure drops below the normal level gradually.

I'll test it. When it's warmer I'll see if it changes without using the heating at all.
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Old 18-02-2010, 19:50
stickler
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You don't have to put up with it, just call British Gas and get them to come out, we did recently and they were really, really good.

They fitted a new expansion vessel and they even fitted a new thermostat having noticed the old one wasn't working and changed the PRV as well. The boiler then developed an unrelated fault and they came out within 24hrs and fixed that as well.
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Old 18-02-2010, 21:55
dee-rec
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I had this a couple of months go, pressure kept slowly dropping and i kept having to sort it. No obvious leaks until after a month of so water starting coming throught the ceiling in the kitchen. Leak had been in pipe under the floor boards upstairs, it was a very slow leak but by the time i dsicovered it, it was like a swimming pool under the floorboards. So i would get someone out asap before it gets to that stage.
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Old 18-02-2010, 22:26
Tynan
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Hello, thanks for this thread, in the same boat with the added bonus in the last three days of f75 meanig I think that the pump is jammed, shot and/or the pressure sensor behind it is jammed

wold the knowledgeable seacam advise on whether this is something a grunt with basic tool can tackle on an ecotec pro?

it's 2 /12 years old btw

I was interested in the leak, tissue paper on joins is rather good

Naturally the most recent f75 is trumping the leak, so far a quick last of filling loop lets it restart ok, usually followed with bleeding a rad to get th epressure back into the grey again

thanks
Tynan
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Old 18-03-2014, 17:04
frales
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Hi

I have the same problem however I know there are leaks. The regularity of topping up the boiler has increased greatly. During the really cold spell the heating was not working due to the pressure going right down. When topped up it worked fine. However, I have just discovered a pool of water below the boiler. It seems the PRV has been operating quite a lot. So I will be calling British Gas to have a look at this. It is due it's annual check.

The other problem I had was that the boiler did not heat the water unless the flow of water was slow. The boiler is a Syntesi E 25 Combi. Is this a crap boiler?.
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