Had my second service on my unvented system. The same thing has happened as last time though. The tundish has started dripping. Last time it was crud that got under the seal on the system. It’s the same again. Plumber just came back and did some things and he could see it had stopped it the loft where the cylinder is then left. The tundish is still dripping though. Has anyone got any thoughts?
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View the thread, titled "Tindish leaking after boiler service" which is posted in Boiler Advice Forum on UK Plumbers Forums.
They can be a right pain, it may stop , try heating it to temp , otherwise you will have to get the engineer back
Could be faulty valve again,
I would say the expansion vessel needs looking at.
Thanks. It already at temperature. He’s been here twice today already. I will message him in the morning if it’s still doing it.
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Hi. That’s what he came back to do.
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How can it have stopped in the loft though and still be doing it outside?
If it's a small enough amount of water coming through it may be trickling down the side wall of the tundish where it's hard to see. The second possibility is that the D2 (discharge pipe) is shared with another appliance which is letting by but I would assume you would probably know if that was the case.
Thanks. Nope just for the boiler. Whole system was fitted brand new 2 years ago.
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Shall I empty some hot water out and warm it back up again?
If it's hot now I don't think it will help to do that. These things pass water after testing so frequently I have heard some plumbers don't even test them at service. However I do not agree with that at all and the device must be tested and if it will not seal it's time for a new one I'm afraid. It really is a pain testing these and all too frequently having them fail. Sometimes turning the head to its full discharge position and letting it snap back shut again can reseat it or clear any debris from it but sadly that doesn't often fix the problem.
Thanks. Why do they fail so soon after install? So it probably needs a new prv? I’ve just emptied the tank and it’s heating up now. I have a Honeywell home so can see it.
Emptying and refilling certainly won't do any harm. The changes in pressure and temperature might, just might stop it but I wouldn't get your hopes up.
Absolute best of luck though.
I really do wish there was a more reliable design being used too. When something fails so often on a routine check to the point plumbers on my last G3 training day were openly admitting to not testing them. That just cannot be right.
Absolute best of luck though.
I really do wish there was a more reliable design being used too. When something fails so often on a routine check to the point plumbers on my last G3 training day were openly admitting to not testing them. That just cannot be right.
just been in the loft and the tundish in the loft is definitely dripping. Is it safe until a plumber comes out?
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cheers it didn’t work. looks like the prv needs replacing. Wish I didn’t got for an unvented system now. If the boiler is too powerful can it cause them to fail often? I think my boiler is to big for the amount of radiators but that’s another story.
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cheers it didn’t work. looks like the prv needs replacing. Wish I didn’t got for an unvented system now. If the boiler is too powerful can it cause them to fail often? I think my boiler is to big for the amount of radiators but that’s another story.
You keep saying boiler do you mean unvented cylinder ? as stated as part of the service these safety devices need to be operated and unfortunately they often dont reseat for whatever reason and need replacing . Kop
Nope. I meant boiler. Can the wrong size of my boiler effect the pressure in the cylinder and this can cause it to fail or like you said it’s just the reseating after a service that does it.
Post a picture please a bit confused here so I dont want to advise you further ???. Kop
Hi. It doesn’t matter about the boiler I was going off topic for a bit. That’s probably a different topic for another day. More concerned about the cylinder at the moment.
What cylinder do you have? they are all different, heatrea sadia megaflo ? These can discharge water through the tundish when the air gap is depleted other manufacturers have now copied their design, others have a external expansion vessel all have temperature and pressure relief valves which operate as a safety devices to relieve excess water pressure and temperature if it is discharging safely then it's ok for the short term but will need a trained operative to diagnose the problem and carry out the necessary repair . Regards kop
It is not dangerous whilst the safety valves are dripping. They will still operate properly in an overpressure/temperature situation.
As for regretting your choice, unvented cylinders are fine pieces of kit and you've been unlucky more than anything. When I service one I've always got a spare valve in case it fails on the test. They don't always fail, just when you service a lot of them you notice the failures adding up.to your average owner they give good service and no hassle.
As for regretting your choice, unvented cylinders are fine pieces of kit and you've been unlucky more than anything. When I service one I've always got a spare valve in case it fails on the test. They don't always fail, just when you service a lot of them you notice the failures adding up.to your average owner they give good service and no hassle.
Sack your plumber that is awful and not fitted to the regulations get a G3 engineer to tidy the system up . Kop
I paid him a lot of money too. What needs doing to it?
To much to list he should be ashamed of himself if he's even qualified to even do the job which I doubt from those pictures I am working today so will back on tonight I am sure the other chaps can guide you apologies . Kop
Sorry Tigermad , these pictures are like a mock-up cylinder in a assessment center on how not to install an unvented cylinder.
I am not here to have a go so as they say on dragons den “ I am out “
I am not here to have a go so as they say on dragons den “ I am out “
Hi. So you are not going to give advice how you would have done it?
Others will pal . I am off working in 5 mins .
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