Replaced PRV and still leaking

[Mary jones]

the PRV has been replaced twice in the past few months and this seems to cure the leak temporarily, however the leak is now worse and is clearly caused by a different problem. The pressure gauge rises quickly upto 3 bars, (we release the pressure manually) but then when the heating/water is off (boiler not running) it loses pressure to zero whilst it’s off. there is an expansion tank already fitted, this was replaced approx 7 years ago. Does it sound like the expansion tank needs replacing or could it be something else?

 

[Best]

Who fitted the replacement PRVs twice?
You need a heating installer to take a look at it all and also service the boiler, whatever boiler it is.
Note the expansion vessel is supposed to be serviced at each service and certainly will not function properly, if at all, unless it gets checked fairly frequently

 

[Harvest Fields]

the PRV has been replaced twice in the past few months and this seems to cure the leak temporarily, however the leak is now worse and is clearly caused by a different problem. The pressure gauge rises quickly upto 3 bars, (we release the pressure manually) but then when the heating/water is off (boiler not running) it loses pressure to zero whilst it’s off. there is an expansion tank already fitted, this was replaced approx 7 years ago. Does it sound like the expansion tank needs replacing or could it be something else?

When was the last time that the boiler was serviced? This should have been checked on the annual service if I’m honest.

 

[Harvest Fields]

Who fitted the replacement PRVs twice?
You need a heating installer to take a look at it all and also service the boiler, whatever boiler it is.
Note the expansion vessel is supposed to be serviced at each service

Posting at the same time again.

 

[Riley]

First things first is the prv and expansion vessel inside the boiler? What boiler is it?

 

[Mary jones]

Thanks for quick reply
There is an expansion tank next to the boiler, there is another one next to hot water tank, the PRV is also next to hot water tank. It’s a pressurised system.

 

[ShaunCorbs]

Any chance of a pic of the prv ?

 

[Riley]

Agreed pic will help. Sounds like you’re a prv short

 

[Harvest Fields]

Agreed pic will help. Sounds like you’re a prv short

Sounds like it needs a service to me.

 

[Riley]

Well yes but I suspect that OP is confused with regard to Safety devices on an unvented and those on the boiler

 

[Mary jones]

Photo of PRV
It’s a potterton boiler

 

[Riley]

And that is solely on the return pipe on your boiler?? What boiler do you have

 

[ShaunCorbs]

Find the red Red expansion vessel

 

[Mary jones]

This is next to hot water tank
It’s a conventional potterton boiler

 

[Best]

Need full photos showing most of hot cylinder and pipework around it

 

[Riley]

So it’s been changed to a sealed system

 

[Harvest Fields]

I am betting it’s been converted and the PRVs are linked in the airing cupboard

 

[Riley]

Is the boiler with the cylinder

 

[Mary jones]

Photo of pipework hot water tank

 

[Mary jones]

Photo of boiler in garage, hot tank upstairs

 

[ShaunCorbs]

Yep sealed system

Red expansion tank needs looking at best get your boiler service guy to have a look at it

 

[Harvest Fields]

So the PRV in the airing cupboard for the heating, should be attached to or next to the red vessel in the garage. I ask again though. When was it last serviced?

 

[Best]

Cylinder and heating discharge joined to one outlet?
Hard to make it all out

 

[Mary jones]

Thank you for your replies
Just to clarify, it appears to be the red expansion tank? The one next to the boiler that has a problem? Not the one next to tank?

 

[Harvest Fields]

Cylinder and heating discharge joined to one outlet?
Hard to make it all out

That was also my guess above mate.

 

[Harvest Fields]

Thank you for your replies
Just to clarify, it appears to be the red expansion tank? The one next to the boiler that has a problem? Not the one next to tank?

So when was the boiler last serviced?

 

[Mary jones]

Probably service couple of years ago now!

 

[ShaunCorbs]

So the PRV in the airing cupboard for the heating, should be attached to or next to the red vessel in the garage. I ask again though. When was it last serviced?

Doesn’t need to be

 

[Best]

Thank you for your replies
Just to clarify, it appears to be the red expansion tank? The one next to the boiler that has a problem? Not the one next to tank?

How do you know that?
Has it been all serviced?
Has the cylinder also been serviced?

 

[Harvest Fields]

Probably service couple of years ago now!

You need a registered gas safe engineer to service the boiler. Also explain the problem that you are having so that he/she can allow the correct amount of time to sort you out. The vessel needs checking every year.