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