Puzzling leak from toilet!

[Stigster]

Hello again, we have cut some flooring up and found the leak! It's on a compression fitting just under floorboards....not sure why it stopped when we removed toilet yesterday....now to try and fix it..

As mentioned above, I expect that when the toilet was connected it put some strain on the pipework and opened a leak on a "just about sealed" compression fitting. With the toilet disconnected the pipework was able to relax a bit, just enough to stop the leak. It's amazing the weird stuff fittings and water can do at times.

I've seen fittings that were fluxed but missed at the point of soldering not leak for years, held together by the dried on flux. I've touch the pipe and it's fallen apart and started leaking.

I hope you've managed to sort your leak out and all is back to normal by now or at least on its way.

 

[Burger]

I've seen fittings that were fluxed but missed at the point of soldering not leak for years, held together by the dried on flux. I've touch the pipe and it's fallen apart and started leaking.

I’ve had that on a gas fitting once , it wasn’t mine before anyone says

 

[MikeJhn]

I've seen fittings that were fluxed but missed at the point of soldering not leak for years, held together by the dried on flux. I've touch the pipe and it's fallen apart and started leaking.

Why does that happen, I'v found three in the last two years in house's I'v bought for renovation, quite perplexing, Oh yes this is in France, so think its not just British plumbers? or is it?

 

[Best]

Why does that happen, I'v found three in the last two years in house's I'v bought for renovation, quite perplexing, Oh yes this is in France, so think its not just British plumbers? or is it?

Typical reason is a lot of plumbers must be fluxing and pushing on the pipes more than one solder fitting before heating and soldering them all.
Therefore very easy to forget about an unsoldered connector a few few away from a soldered tee, etc.
I generally solder each fitting before pushing another together

 

[MikeJhn]

I never flux a joint until I am ready to solder, so don't think I have ever missed one, famous last words come to mind.

 

[Aire]

I did it on a gas pipe once. Luckily it was outside but as best said. I pieced the whole run together. Soldered a few fittings, got talking, soldered a few more. Tightness test held up that evening but following day. Sunshine direct on pipe, expansion happened and joint started leaking. Only done it once and that once was enough to learn to flux and solder as I go.