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?

 

[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.