SUPRALOOPY Posted October 14, 2007 Share Posted October 14, 2007 need some advice please!! Link to comment Share on other sites More sharing options...
ECK Posted October 14, 2007 Share Posted October 14, 2007 call a engineer!!!! Link to comment Share on other sites More sharing options...
SUPRALOOPY Posted October 14, 2007 Author Share Posted October 14, 2007 WoW such words of wisdom THANKS!! now f**k off :-) ;-) Link to comment Share on other sites More sharing options...
dangerous brain Posted October 14, 2007 Share Posted October 14, 2007 I'm no engineer but I fix my own boiler every time it goes wrong and as I have had combi boilers for years I have been doing a lot of fixing. List up the snags and I will see if I know what it is chap. Link to comment Share on other sites More sharing options...
SUPRALOOPY Posted October 14, 2007 Author Share Posted October 14, 2007 Thanks. well I'm losing pressure but only when the heating is turned on? I can turn on the heating for 10 mins only and the pressure just drops to 0 bar? when just in hot water only mode and topped up to bar cold it holds fine? I don't think i have any leaks as it would leak down with hot water only would'nt it? I was wandering if there is an expansion tank in the boiler that could be at fault? Link to comment Share on other sites More sharing options...
Fargo Posted October 14, 2007 Share Posted October 14, 2007 what boiler is it, combi ?. the pressure is for the heating, doesnt have anything to do with the water, apart from lack of water in the boiler itself of course (then it shouldnt fire up) hot water generlly runs on a seperate setup on most boilers. have you checked the presure relief valve that come from the boiler to the outside of the house, could be leaking there. its poss the exp vessel could be faulty, but generally if it was you would see a drastic rise in the pressure, (3/4bar etc) could be rising above 3bar and blowing out the PRV (but hten you should here this happen) and as a result empting itself. really need to know what boiler it is Link to comment Share on other sites More sharing options...
SUPRALOOPY Posted October 14, 2007 Author Share Posted October 14, 2007 Glow worm compact.. and when the heating is on it does get fooking high on the gauge.3/3.5 bar and does leak a bit out of the saftey valve but as soon as it gets back to 2.5 bar it stops. that is testing the system with all rads on full whack!! Link to comment Share on other sites More sharing options...
Havard Posted October 14, 2007 Share Posted October 14, 2007 Dave! Talk us through everything that happens when you switch the boiler on! From cold you should have 1 bar on the gauge. What pressure does it rise to before the pressure drops? If you vessel was fooked you'd only notice when the system cooled down as the expansion will have been pushed out of the PRV but the system will still be full, when it contracts and cools then the pressure will drop and the boiler will lock out! Could be a crack in the heat exchanger but you would have plumes of steam coming out of the boiler flue. I would also expect the burner to flood if this was the problem. I had a problem with an Ideal combi recently where a crack in the HE would open when hot and I would lose pressure through the flue in steam, took me ages to figure where the water was disappearing!! H. Link to comment Share on other sites More sharing options...
SUPRALOOPY Posted October 14, 2007 Author Share Posted October 14, 2007 Boiler is fine when in hot water only mode. switch it to heating/hot water and the heating kicks in. gauge goes up to 3 bar (not good) then starts to let a little bit out of the safety valve to the outside of the building. turn the haeting off and when it cools down no pressure? but it only takes a blip of the refil bypass hose to get pressure back (i know i should remove this pipe but hey) Now i either have a fooking big leak? (thats bad as all pipes are underground in concrete) or the boiler is fooked. Link to comment Share on other sites More sharing options...
Havard Posted October 14, 2007 Share Posted October 14, 2007 Boiler is fine when in hot water only mode. switch it to heating/hot water and the heating kicks in. gauge goes up to 3 bar (not good) then starts to let a little bit out of the safety valve to the outside of the building. turn the haeting off and when it cools down no pressure? but it only takes a blip of the refil bypass hose to get pressure back (i know i should remove this pipe but hey) Now i either have a fooking big leak? (thats bad as all pipes are underground in concrete) or the boiler is fooked. Defo the pressure/expansion vessel mate!! I would imagine the gas has air inside has escaped as it's only held in by a tyre valve. OR the diaphragm has ruptured. The symptoms are still the same, the vessel completely fills with water instead of being half gas/half water. This water expands quickly when heated and is ejected out of the system by the PRV as a safety measure. You are then left with a full hot system but when it contracts you are back to SQ1. This shouldn't be expensive mate!! H. Link to comment Share on other sites More sharing options...
SUPRALOOPY Posted October 14, 2007 Author Share Posted October 14, 2007 I hope you are right.. As i am insured with BG and they will get a bollocking tomoz as they have just done their " annual service " on the fooking thing!! Link to comment Share on other sites More sharing options...
Havard Posted October 14, 2007 Share Posted October 14, 2007 I hope you are right.. As i am insured with BG and they will get a bollocking tomoz as they have just done their " annual service " on the fooking thing!! I am right mate! I do this for a living.... I don't normally do domestic stuff, I do big commercial heating systems and water pressurisation but all the principles are the same!! H. Link to comment Share on other sites More sharing options...
Fargo Posted October 14, 2007 Share Posted October 14, 2007 but generally if it was you would see a drastic rise in the pressure, (3/4bar etc) could be rising above 3bar and blowing out the PRV (but hten you should here this happen) and as a result empting itself. bingo. lol i work for BG, not all things are evident at time of service you know. you might get away with simply pumping the vessel back up using a pump, however the diaphram may well be perforated. cant recall where the exp vessel is on the compact, but if its not easy to get outm then fit an external vessel, easy enough, 30 mins work or so.. Link to comment Share on other sites More sharing options...
SUPRALOOPY Posted October 14, 2007 Author Share Posted October 14, 2007 I so fuckin hope so as all my pipework is underground. I'll look into it thanks. Link to comment Share on other sites More sharing options...
SUPRALOOPY Posted October 14, 2007 Author Share Posted October 14, 2007 oh btw if you are right.. look out at JAE as I'll hunt you both down and fill you full of beer.. Link to comment Share on other sites More sharing options...
Fargo Posted October 14, 2007 Share Posted October 14, 2007 the external vessel would hook up to your flow or return pipe from the boiler so no need to dig up pipes. Link to comment Share on other sites More sharing options...
Fargo Posted October 14, 2007 Share Posted October 14, 2007 oh btw if you are right.. look out at JAE as I'll hunt you both down and fill you full of beer.. vodka please Link to comment Share on other sites More sharing options...
SUPRALOOPY Posted October 14, 2007 Author Share Posted October 14, 2007 vodka please If you are right Link to comment Share on other sites More sharing options...
Fargo Posted October 14, 2007 Share Posted October 14, 2007 lol indeed... Link to comment Share on other sites More sharing options...
SUPRALOOPY Posted October 14, 2007 Author Share Posted October 14, 2007 ok losing pressure still and on hot water only. is it still cooling down?? Link to comment Share on other sites More sharing options...
Fargo Posted October 14, 2007 Share Posted October 14, 2007 is it coming out the PRV outside. Link to comment Share on other sites More sharing options...
SUPRALOOPY Posted October 14, 2007 Author Share Posted October 14, 2007 nope thats fine under 2.5 bar Link to comment Share on other sites More sharing options...
ECK Posted October 15, 2007 Share Posted October 15, 2007 WoW such words of wisdom THANKS!! now f**k off :-) ;-) hey dude no offence intended my good man you dont want to be fiddling about with gas boilers what if something goes wrong? just the exact same thing was on hollyoaks and everyone was poisoned!!! you dont want that:Pling: alex Link to comment Share on other sites More sharing options...
dangerous brain Posted October 15, 2007 Share Posted October 15, 2007 Mine was doing the said same thing. I was told it was the expansion tank and a simple inflation of the tank using a car foot pump fixed it up. The water dribbling out of the overflow outside was the indicator of that. The system still slowly lost water over time so I was convinced that there was a leak somewhere in the system. Link to comment Share on other sites More sharing options...
SUPRALOOPY Posted October 19, 2007 Author Share Posted October 19, 2007 They agreed with the cause. Thanks havard! But all he did was pump it back up:blink: And told the mrs that it was perferated and just needed pumping up? If its perfed then its fucked right? So he should replace it, Anyway I've run the heating and guess what it still lets by the saftey valve and loses pressure. So we have phoned them and said they need to sort it out NOW!!!! Link to comment Share on other sites More sharing options...
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