Leak on compression fitting on ch flow pipe from boiler

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Alan Thornton

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Hey guys

I have a logic system s24IE boiler which has a leak on the ch flow pipe fitting below the boiler
(see pic attached)

I would be fairly handy DIY wise so I went at it today and did manage to suppress the leak a small bit by really tightening the nut. The thing is I think it needs a need fitting. I shut the water off at the mains and I also turned of 4 valves in the hot press which normally turns water off going to taps and bathrooms etc. However as I went to loosen the nut on the leaky fitting water started pouring out for a good few minutes so I’m unsure I’ve done the right thing in shutting the water off going to that pipe. If I could get the water off properly I do think I could replace the fitting myself. Any ideas? I’ve a vented cylinder in hot press.

Thanks

Alan
 

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Tighten it some more.
If that doesn’t help undo the nut on the side that’s leaking with a towel handy to catch water then get some ptfe or jointing compound and slide the nut off the fitting whilst you hold the pipe pushed in to the fitting and apply paste or ptfe.
Then retighten.
 
Hi thanks for reply. The thing is I don’t know if ive the water turned off properly. I turned it off at the mains and also in the hot press. When I began to loosen the nut. Water started pouring out and at no stage was it stopping so I didn’t remove nut completely. I just retightened. Still a tiny leak
 
The method I said takes balls! As long as you hold the pipe in to the fitting you could do what I said.
I say hold it as if it’s in loose pipework it can pop out
 
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Nice one! I’ll make a solid attempt at that. Is there an olive ring in them pipes. If so I may have damaged by over tightening. Thanks again
 
There’s an olive yes. When I have a leaking compression I try to tighten it. then next would be jointing compound, if there was still a problem a few wraps of ptfe would fix it.
If that didn’t work which is unlikely! I’d be thinking the pipes cracked in the fitting or summat like that
 
That pipe isn't anything to do with the hot or cold water. That's the flow pipe from you boiler. As the system is sealed then you'll need to drop the pressure from the system and drain it to that point before you can loosen that nut and then use tape on the olive.

Careful if just tightening as you can overtighten a compression fitting - harder to do with 22mm TBH - and cause a situation where the pipe either becomes 'necked' or the olive becomes 'over compressed' and then it'll be difficult to get it to seal.

Ideally you would drop the pressure and drain then loosen the fitting and check the pipe is far enough into the olive/fitting first then use a couple of turns of PTFE tape on the olive and nip it back up.
 
Madrab said:
That pipe isn't anything to do with the hot or cold water. That's the flow pipe from you boiler. As the system is sealed then you'll need to drop the pressure from the system and drain it to that point before you can loosen that nut and then use tape on the olive.

Careful if just tightening as you can overtighten a compression fitting - harder to do with 22mm TBH - and cause a situation where the pipe either becomes 'necked' or the olive becomes 'over compressed' and then it'll be difficult to get it to seal.

Ideally you would drop the pressure and drain then loosen the fitting and check the pipe is far enough into the olive/fitting first then use a couple of turns of PTFE tape on the olive and nip it back up.
Click to expand...

Cheers. When the boiler is switched off and isolated at the mains I assume that will kill the pressure. The question is how do I drain to the point of the leak? Thanks.
 
Alan Thornton said:
When the boiler is switched off and isolated at the mains I assume that will kill the pressure
Click to expand...
No, you will have a connection (filling loop) on the CH pipework somewhere but even then that won't release the pressure. Your system is sealed therefore will hold the pressure that's been input until it is released mechanically by loosening a joint or a bleed valve somewhere.

If you are unsure about all of that and not sure how your system is filled etc then I would avoid trying to do this as it is essential to understand how that all works, especially if you have system valves and a hot water cylinder that the boiler heats, to ensure your system can be re-filled and re-pressurised so it will all work properly.
 
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