Search the forum,

Discuss Loads of air in central heating. in the Plumbing Jobs | The Job-board area at PlumbersForums.net

Messages
38
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 work gone on with the system?
 
Could be corrosion producing hydrogen
 
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?
 
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!
 
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?
 
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
 
Something about this picture looks funny and I cannot put my finger on it?

1664F000-5195-4721-83D7-5707B65C1796.png
 
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, 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?
 
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.
If it’s plumbed wrong then yes but if it’s worked fine up till now then Doubtful. The pipes out of the front of the cylinder are flow and return from the boiler
 
It has worked fine until this week. I'm worried that a blockage somewhere will be causing it to suck in air from the expansion pipe(?).

I will have to check tomorrow night as the cylinder in also in the kids bedroom!

Thanks for your help :)
 
It has worked fine until this week. I'm worried that a blockage somewhere will be causing it to suck in air from the expansion pipe(?).

I will have to check tomorrow night as the cylinder in also in the kids bedroom!

Thanks for your help :)
The reason I asked about the pipe being hot and the water in the f & e being hot is sometimes they can pump over. This will definitely be sucking air in if it is.
 
5 minutes refilling the f&e tank every time you switch heating off. That is a lot of water going somewhere. Sounds to me like you have a leak in your heating pipework. If it was upstairs you’d see it coming through the downstairs ceiling so it may well be that a heating pipe hidden under the downstairs floor has sprung a leak in the cold weather?
 
5 minutes refilling the f&e tank every time you switch heating off. That is a lot of water going somewhere. Sounds to me like you have a leak in your heating pipework. If it was upstairs you’d see it coming through the downstairs ceiling so it may well be that a heating pipe hidden under the downstairs floor has sprung a leak in the cold weather?
Not a bad shout to be fair.
 
After bleeding it earlier this evening, it was on for a few hours being very slow to get warm.
After turning it off it was refilling for at least 15 minutes until I turned the valve off.

No signs of condensation.
There’s still air moving around quite loudly 20 minutes after turning heating off.
All downstairs pipes are buried in the concrete floor.
Worrying.
 
If you look near the roofline outside you will see the ‘overflow’ pipe coming from the f&e tank for the ch. when the heating is on tomorrow look to see if any water is coming through that pipe. If it was ‘pumping over’ water coming out of that pipe could confirm it. If not and you are still losing water then that water has to be going somewhere else ie a (likely) leak in downstairs underfloir pipework.
 
After bleeding it earlier this evening, it was on for a few hours being very slow to get warm.
After turning it off it was refilling for at least 15 minutes until I turned the valve off.

No signs of condensation.
There’s still air moving around quite loudly 20 minutes after turning heating off.
All downstairs pipes are buried in the concrete floor.
Worrying.

With the amount of water you are losing I would expect a carpet to be wet if a pipe within the concrete floor had failed.
 

Reply to Loads of air in central heating. in the Plumbing Jobs | The Job-board area at PlumbersForums.net

Creating content since 2001. Untold Media.

OFFICIAL SPONSORS

OFFICIAL SPONSORS

Back
Top
AdBlock Detected

We get it, advertisements are annoying!

Sure, ad-blocking software does a great job at blocking ads, but it also blocks useful features of our website. For the best site experience please disable your AdBlocker.

I've Disabled AdBlock