Too much pressure in boiler

[Dye]

I stupidly turned the pressure up on a thermo compact valliant boiler, and turned it up to much. It went up into the red. I'm bleeding the radiators now and the pressure has dropped but it isn't staying constant. I've been bleeding them for about two hours and the water is still flowing out - is this normal? - and what will happen if I stop bleeding them as regards the pressure. The heating, hot water is off. I have an immersion tank and have turned the tap that connects the boiler to the immersion tank off but the tap that feeds the radiators is open (I think that's what it's for the radiators)- it comes out of the bottom and goes into the floorboards).

Help - it's freezing and I'm worried about tonight because I'll have to sleep at some time and won't be able to empty the constantly filling buckets.

Thanks Diane

 

[Bahco]

Can you give more info on your system pls

I've been bleeding them for about two hours and the water is still flowing out - is this normal?

Yes, you stop bleeding when water comes out as you only bleed the air out.

 

[Dye]

It's a compact thermo valliant boiler, there's an imersion tank and a water tank above the flat upstairs, that's all I can tell you. It's all ok now - I think I had the pressure value open, I'd tried to increase the pressure - but didn't really know what I was doing, I'd seen my brother do it before (first mistake). Needless to say the needle went into the red. That's why I started bleeding the radiators. I think I worked out that that valve turns in 90 degres and it must have been open because the pressure wasn't coming down even though the radiators were being drained/bled for hours. I turned the pressure valve 90 degrees as I said and that seems to have stablised it. Does that sound right to you?
Thanks for getting back to me - heating is back on now -

Diane

 

[Bahco]

You need to get the pressure to about one bar if it is a combi but I am unsure about your system.

Glad its sorted.

 

[Dye]

At the moment it's about 2.5 with the heating and the hot water on - how do I know if it's a combi? And how do I get it down to 1? - do I do the bleeding thing again? - please forgive my ignorance -

Many many thanks
Diane

 

[Bahco]

You should have a drain valve under anyone of your downstairs radiator.

Put a roller tray or similar under it and open the valve slowly.

More here

Drain water out slowly until the needle is at 1 bar.

 

[Dye]

Hello again - can't find the valve your talking about (I looked at the picture) - I live in a flat - and the pressure's started rising again so ive turned the hot water off - is it likely that there isn't a valve and if so what should I do?

Many many thanks
Diane

 

[Bahco]

Sorry I cannot help you any further.

Maybe one of the Corgis will come to your rescue.

 

[Dye]

thanks for trying - just hope it's not dangerous

 

[WDIK]

several things spring to mind,
why did you feel it needed topping up?
was it low?
so you topped it up,
did you undo and remove one end of the flexible cold fill loop?
if you didnt it could still be filling from the mains.
you really need to drain it off when its cold and as bacho said set it to about 1 bar, then see what it does when you turn the heating back on.

 

[gas4you]

Turn boiler off and let it cool for 30 mins. Does the pressure drop back to about 1-1.5 Bar?

If not get a tray or dish and place under rad at the air bleed end. Open this up and let water out until pressure drops back.

Check, as said, that you have turned off the filling loop fully.

It is norma;l for the pressure to start at around 1-1.5 Bar cold and rise to around 2 Bar hot, then drop back again when cooled.