How can i fix the pressure keep on my vokera excell 80 sp?

Thanks, do you mean the domestic heat exchanger or main heat exchanger?

Stuart Pickup
June 2007

Have you checked the filling loop? Try disconnecting it first to see if it is passing water when turned off.

Terry
June 2007

your dhw (domestic hot water) heat exchanger is passing water to your primary circult. in other words its split allowing mains water to the heating side
needs a new heat exchanger, shut your mains stopcock for now to you can get it fixed. that will stop the pressure rising and your prv leaking (overflow)

hi-spec plumbing
June 2007

Yes, it rises up to about 3 bars each time

Stuart Pickup
June 2007

is it going up to about 3 bar ?
does it go up without the heating on ?
shut your mains water stopcock release the pressure back to 1.5 bar, then check gauge. is it not rising now.?

hi-spec plumbing
June 2007