How do I increase the pressure in a combi boiler????

[MaryMotherOfCheeses]

I know there was a thread about it here recently. But I can't find it sorry.

I need to do ours and don't know how. And there's no instruction book. I know it should be easy.

Also, the radiators keep getting air in them and keep needing bleeding, so I'm guessing that effects the boiler?

Don't know. Help?

do you mean the water pressure?

My dad was a gas engineer

He'll be spinning in his grave

Sorry dad!

yes the water presure.

You need to let more water into the system. Our combi boiler has a hole underneath into which you put a plastic 'key'. Turn it 90 degrees and water fills the boiler and you see the pressure rising. It should be about 1-1.5 bar.

If you keep getting air in the system and the pressure is dropping because you need to bleed the rads, then you should get your boiler serviced/checked.

in that case... you need to expose the pipes leading to your boiler. once you can see them there will be a hose with a tap on it leading from one pipe to another. turn the tap very slowly and keep an eye on the pressure gauge as you do it. do you know what pressure it should be?

sidge, you sure about the 1-1.5 bar? i thought different makes = different pressure

Our old boiler had one of those plastic keys but I can't see a place for one on this one.

Do some not use them? Miamla, your version sounds like it doesn't?

mine def didn't have a plastic key

can you see the pipes that go into the boiler? the two you're interested in are ... the feed from the mains water into your house and the inlet into your boiler. the water in your central heating and boiler is a sealed system (or at least it should be!) so there has to be a way of topping the system up and this can only be done using a hose between the two pipes i mentioned above

if you're not sure, can you take a photo of the pipes and i'll have a look for you

it sounds like the plastic key method is a user friendly version of what i had

Right, there's a few pipes going in. There are three coloured caps on them. Red, yellow and blue. The one with the blue end also has a flexible metal pipe going into it. I think this is probably the cold water feed. I think. It has a blue small plastic like tap on it.

I'm looking at it thinking that's the one and that I just turn it gently.

If I've got it wrong will it blow up???

I think I might just post a picture later...

So later that afternoon...

I was just looking at the pipes again. And I found myself turning the little blue tap.

It worked.

It hasn't blown up yet!

Now to sort out those radiators...

yeah! well done Mary M Of C

well done, I just came on to check you had got it as the other thread was mine and it took me a whole day (and it was bloody cold) to find the tap, ours was under the sink.
Bleed the radiatoras and then fill the system straight up.

Sorry late coming back to this - Miamla you may well be right about the pressure varying with makes. All 3 houses we've had combi boilers in all needed 1-1.5 bar so I assumed that was a standard!

MMOC well done you