Loads of air in central heating.

[Chris12345678]

Evening,

I am getting a lot of air in my central heating system.
After turning the heating off, the header tank (in loft) is refilling for maybe 5 minutes, and you can hear the air passing through one of the upstairs radiators for a further 5 minutes.
I can't find any leaks and nothing is coming out of the overflow on the header tank?

Thanks.

 

[Chris12345678]

Oh, and the CAPTCHA thing on registration doesn't work on 'What is next day after Tuesday?'

 

[rpm]

Oh, and the CAPTCHA thing on registration doesn't work on 'What is next day after Tuesday?'

Just another day? 😀

 

[ShaunCorbs]

Any work gone on with the system?

 

[Chris12345678]

Any work gone on with the system?

No, nothing at all.
I've always had air getting into it, and having to bleed maybe twice a winter, but this is silly!

 

[townfanjon]

Old system , pics of boiler and pipework may help .

 

[ShaunCorbs]

Could be corrosion producing hydrogen

 

[Chris12345678]

This might take a few attempts:

https://i.*********/RLP4eaB.jpg
https://i.*********/y0PWylH.jpg
https://i.*********/bwgyzec.jpg

 

[Harvest Fields]

Evening,

I am getting a lot of air in my central heating system.
After turning the heating off, the header tank (in loft) is refilling for maybe 5 minutes, and you can hear the air passing through one of the upstairs radiators for a further 5 minutes.
I can't find any leaks and nothing is coming out of the overflow on the header tank?

Thanks.

Any water leaking from the overflow outside when the heating is on?

 

[Chris12345678]

No, nothing from overflow at all.

 

[Harvest Fields]

No, nothing from overflow at all.

Is the water in the f&e hot when the heating is on?

 

[Chris12345678]

Is the f&e tank the one in the loft that feeds the cylinder (pipes are at the front of the cylinder in the picture)?

If so, I don't know, it's in the loft and the kids are in bed so I can't currently go up there!

 

[Harvest Fields]

Not the one in the picture. The one in the loft that feeds the boiler

 

[Chris12345678]

That's the one I was meaning. I can't get up in the loft at the moment, kids are in bed and the ladder is under their bed!

I suppose it could be sucking in air via the cylinder vent that goes to the f&e tank?

 

[Harvest Fields]

That's the one I was meaning. I can't get up in the loft at the moment, kids are in bed and the ladder is under their bed!

I suppose it could be sucking in air via the cylinder vent that goes to the f&e tank?

Nope. Separate circuit

 

[Harvest Fields]

Something about this picture looks funny and I cannot put my finger on it?

 

[Chris12345678]

There are no valves to separate the heating / central heating circuits.
Does that make a difference?

 

[Harvest Fields]

There are no valves to separate the heating / central heating circuits.
Does that make a difference?

The system will be gravity. Your hot water that comes out of the taps and the heating water are completely separate mate.

 

[Chris12345678]

Yes, but there are two pipes coming out of the front of the cylinder that go to the tank in the loft. One is a feed and one is a expansion pipe(?) from the cylinder isn't it? Could it be sucking in air from the expansion pipe(?).

Thanks.

 

[Harvest Fields]

Yes, but there are two pipes coming out of the front of the cylinder that go to the tank in the loft. One is a feed and one is a expansion pipe(?) from the cylinder isn't it? Could it be sucking in air from the expansion pipe(?).

Thanks.

Yes it could. Is the 22mm pipe hot all the way up?