PLUMBING...Radiator hot at the bottom Only..help

[G20RG B]

2 of my upstairs radiators are only getting hot at the bottom , I have tried bleeding them with the "key" at the top left but very little air is coming out.

The inlet pipe is very hot and the outlet pipe is very hot as is the bottom of the radiator, but it seems no hot water is rising to the top of the radiator.Have i got an airlock inside the radiator panel?.

Anyone got any suggestions were expecting subzero temperatures over the weekend and one of the radiators is in the kids room so I would realy like to get this sorted.

Any help would be great..

[V8mate]

You are Petrol_Penelope AICMFP.


ETA Link

http://pistonheads.com/gassing/topic.asp?h=0&t...

Edited by V8mate on Friday 13th February 16:20

[Thudd]

Top up the pressure in the system then try bleeding them again.

[Scotfox]

All see here re balancing the system:-
http://www.pistonheads.com/gassing/topic.asp?h=0&a...

[NDA]

Have you bled all the radiators in your house? Go around and do every one if not.

Be patient and ensure that each one is dribbling water from the valve.

[GreenV8S]

G20RG B said:

2 of my upstairs radiators are only getting hot at the bottom , I have tried bleeding them with the "key" at the top left but very little air is coming out.

When you say "very little air is coming out" I take it you mean you're getting water out but no air? An air lock in the radiator is the only explanation I can see for it being cold at the top. If it's got limited water flow, usually it's the top that gets warm (heat rises and all that).

[dodgyviper]

GreenV8S said:

G20RG B said:

2 of my upstairs radiators are only getting hot at the bottom , I have tried bleeding them with the "key" at the top left but very little air is coming out.

When you say "very little air is coming out" I take it you mean you're getting water out but no air? An air lock in the radiator is the only explanation I can see for it being cold at the top. If it's got limited water flow, usually it's the top that gets warm (heat rises and all that).

Could be sludged up. yummy job

[catso]

Are you bleeding it with the pump running or off? I have a radiator that regularly needs bleeding and it will only bleed properly if the pump is off.

[Iain328]

G20RG B said:

2 of my upstairs radiators are only getting hot at the bottom , I have tried bleeding them with the "key" at the top left but very little air is coming out.

The inlet pipe is very hot and the outlet pipe is very hot as is the bottom of the radiator, but it seems no hot water is rising to the top of the radiator.Have i got an airlock inside the radiator panel?.

Anyone got any suggestions were expecting subzero temperatures over the weekend and one of the radiators is in the kids room so I would realy like to get this sorted.

Any help would be great..

First thing's first, have you got a combi boiler or a standard one?

if its a combi then you may need to increase the pressure in the system , then bleed, then check the pressure again (which should have dropped when you get the air out for obvious reasons).

If its a standard system with a hot water tank & a header tank then try bleeding it with the pump turned off. In fact in either case, try bleeding it with the pump off.

Edited by Iain328 on Friday 13th February 16:53

[G20RG B]

Right guys,

Thanks for all your help.......ITS SORTED

The pressure in the system was to low just a noch above 0.

I have increased it to 1.5bar and bled the radiators and air came wooshing out and the heat has risen through the radiators...boiling.

Thanks for all your replies especially THUDD

Edited by G20RG B on Friday 13th February 18:01

[NDA]

Iain328 said:

First thing's first, have you got a combi boiler or a standard one?

if its a combi then you may need to increase the pressure in the system , then bleed, then check the pressure again (which should have dropped when you get the air out for obvious reasons).

If its a standard system with a hot water tank & a header tank then try bleeding it with the pump turned off. In fact in either case, try bleeding it with the pump off.

Which is EXACTLY what I would have said.

Assuming I had that sort of technical knowledge.

And could sum it up neatly in a couple of sentences.

Accurately.

Glad you're toastie again.

[Iain328]

G20RG B said:

Right guys,

Thanks for all your help.......ITS SORTED

The pressure in the system was to low just a noch above 0.

I have increased it to 1.5bar and bled the radiators and air came wooshing out and the heat has risen through the radiators...boiling.

Thanks for all your replies especially THUDD

Edited by G20RG B on Friday 13th February 18:01

Glad to hear its fixed for the moment. Sadly your next quest might be to investigate why the pressure dropped if it does so again in short order. Keep an eye on it for the next week or two.