Potterton boiler help ( pressure )

[Grant123]

Good afternoon all,

Recently bought a new house and after a few weeks our heating stopped working. Had a look around online here and spoken to a few people and running around in circles.

For my heating to work and stay on I have to open up the heating return valve, however, by doing this my boiler pressure keeps going up and up until I switch it off. Then once it’s off the pressure over an hour or so drops back down and my boiler switches itself off again.

I have a Potterton Combi gold HE. All help is welcomed. Thanks

 

[jtsplumbing]

Have you found where the water is going ? leak on system or going to the outside from the safety discharge pipe, may just be a faulty PRV need to call someone in as it will involve removing the boiler case

 

[Grant123]

Nothing is coming out of the discharge pipe nor can I find the leak even under the floor boards downstairs

 

[ShaunCorbs]

What's the pressure standing at when cold and then when it's hot

 

[Grant123]

At the bottom of 1 and will sit there and hot water is fine. When the heating return valve is switched on it will sit at top end of 2 the start to slowly rise

 

[ShaunCorbs]

That's normal shouldn't go past 2.5 bar

 

[Grant123]

But for me to get my heating to work I turn the valve to on and it keeps going up past 3

 

[ShaunCorbs]

When cold does the pressure rise ? With the valve open

 

[Grant123]

Just tested and yes

 

[ShaunCorbs]

The two valves are shut In the pic ?

(Black wheel head ones)