Potterton Boiler losing pressure but then over pressurises!

[Chrisab]

Hi,

My boiler (3yr old in new build) turns it self off when pressure drops below 0.5bar fairly regularly (1-2months) which has always concerned me as to why. I normally let a little more water in and everything works fine - until yesterday.

The pressure had gone below 0.5bar in the day (although it was fine in the morning) so when I got home I pressurised it up to 1bar ish. That was fine but then during running the pressure was creeping up into the red (i.e. 2.5+). So I drained a small amount of water from the rad so that it was sitting at about 2.25. Ran fine for an hour or so and then turned it off for the night.

Woke up this morning at it's turned itself back off again as pressure has dropped. I pressurised again and you know what then happened. It creeped up to 2.5-3bar; so I turned it off and left the house!

So I've been reading up on here - does it sound like I need to re-pressurise the PV or does it sound like it's broke/piped blocked?!

I can't see a leak anywhere unless it is in the walls.

Many Thanks
Chris

 

[dcawkwell]

Expansion vessel needs pumping up with a foot pump. Common problem. It will be dumping the water outside.
If it is a new build these boilers sometimes come with 5 or 7 year warranty so get manufacturer out.

 

[Chrisab]

Hi,

It's not dumping water at the moment but I guess will only do that if pressure goes over 3bar?

 

[Agile]

Depending on the model it may not be a DIY job to access the EXV to repressurise.

Interesting question of whether topping up the EXV at every annual service should be considered a warranty issue. I never thought that it was.

Tony

 

[Chrisab]

Hi

It's a potterton gold range system 24kw 4159216.

Is this a diy job?