View Full Version : Any plumbers/heating engineers on here?
If so i have a boiler question for you. :)
its broken, hope that helps
its broken, hope that helps
lol
lol no welding won't cure it
put a jumper on then, summer will soon be here lol
put a jumper on then, summer will soon be here lol
I would, put the wife/daughter won't
Whats wrong?
I've nursed our POS combi along for the past 3-4 years so have a vauge idea about how this stuff works without the need for being fisted by a 'gas safe' person
General Baxter
23-11-10, 08:19 PM
ill have ago,
i fixed our boiler, with a 2p and some glue lol
It keeps going over pressure and venting water out. (small gauge for radiators) We had a plumber come look at it, who diagnosed the expansion vessel, he replaced it, but it's still going over pressure. I have to bleed about 5l of water out of a radiator every couple of days. It's a 3 year old vaillant.
Pass.... sounds proper fecked lol
personally id get the plumber back and tell him he hasnt sorted it
Is the tap that fills the system fooked, it should be under the boiler on a flexi? I have to fill mine up every now and again with it
personally id get the plumber back and tell him he hasnt sorted it
Already done that, they're coming back later this week. Not over confident with them now lol
Is the tap that fills the system fooked, it should be under the boiler on a flexi? I have to fill mine up every now and again with it
It opens and closes fine, might be though. There's 2 taps on ours, looped together.
Surely thats the only way water can get into the system, its a closed loop it should be at 1.5 when hot iirc, something is filling it with water, I bet the tap isn't completely closing
Surely thats the only way water can get into the system, its a closed loop it should be at 1.5 when hot iirc, something is filling it with water, I bet the tap isn't completely closing
Sounds good! I will get them to inspect them!
I'd turn the taps off and take the filling loop off (you are kinda supposed to anyway). That way you can 100% eliminate that.
Other than that I cant see how 2.5L/day of water is getting into the system
sell the excess hot water to window cleaners
the problem is like this....
mains fed water simply can't compress (waits for stu to get all lab coat on my ass) so if you left the supply tap on, it couldn't get any more water into the system, all it can do is compress the expansion vessel.
if you are having to bleed the water/air mixture out, i'd be looking for a problem in the circulation system, ie the pump, as it sounds to me like the water is boiling up in there, and also check the blow off whilst you are at it.
is there anything coming out the overflow?
i've never owned a corgi, but i did install my own central heating system a few years back..when it was still legal to do your own gas work.
It still is legit to do your own gas work. You just can't do it for any one else for reward. Should something go wrong then you must demonstrate should it go to court that you are competent.
FWIW it does sound like the tap on the filling loop is passing. That is the only way in a sealed system that the pressure can rise that much.
Obviously running the boiler will cause expansion but the overheat thermostat would shut the boiler down waaaay before the water temp got to the levels needed for it to expand as much as the the OP says.
but can an expansion vessel hold 5 litres of extra water on a normal domestic system???
on mine, the filling pipe has a wing nut on one end, so it is dead easy to undo.
I guess it depends on the expansion vessel, but 5L is a shed load to hold really...... Then again if its one of those non combi'd systems with the little donkey tank above the main tank then its hugely likely it can take 5L.
Well i spoke to the plumber today, the expansion vessel was fooked (he's saved it to show me, how often does that happen!) it was full of water.
I've only ever filled it through the mains taps on the bottom of the boiler, after we had a leak on a pipe, and as soon as the rads were bled in shut the mains water off. I'm just off to disconnect the flexi out of the loop now.
but can an expansion vessel hold 5 litres of extra water on a normal domestic system???
on mine, the filling pipe has a wing nut on one end, so it is dead easy to undo.
Quite possibly. Something like 12 or 18 litres would be normal.
well foks, i've just incoupled the flexi from the tap nearest the boiler. After half an hour i had about a litre of water in the bowl, it's dripping out of the tap and the the discnnected flexi (the other end is still connected the the mains tap) So i'm guessing both taps are fubared and the reaon why the expansion vessel was fooked?
rep left guys!
General Baxter
24-11-10, 07:55 PM
rep left guys!
do i get some, telling you to jab 2p's into it lol
do i get some, telling you to jab 2p's into it lol
No! lol
General Baxter
24-11-10, 07:57 PM
well it fixed mine lol
the reaon why the expansion vessel was fooked?
rep left guys!
the expansion vessel is just an accumulator (think citroens) and will have something like a gas filled bladder inside, and too much hydraulic pressure, as in too much water will eventually burst the bag.
the expansion vessel is just an accumulator (think citroens) and will have something like a gas filled bladder inside, and too much hydraulic pressure, as in too much water will eventually burst the bag.
There is a PRV (pressure relief valve) to stop this happening. They don't vent to air like an old overflow so you'd probably never even know it had been releasing pressure.
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