Radiator not getting warm

clint123

I have a rad in the bedroom, and when the heating is on,only the bottom half of the rad will heat up, I have turned all the other rad's in the house off and still only the bottom half will heat up, anybody got any ideas ? thanks

Fr Tod Umptious

Try bleeding it.
The top half of it may be full of air.
On the top left or right of the rad there should be a little 'nut' or 'screw'.
Start slowly opening it and you should hear air escaping, keep opening it slowly until water starts coming out.
You may want to have a towel handy so that the water does not go all over the place.
Close the nut once all the air is out.

clint123

I've looked for that , but there is no screw on top right or left !!....

Sparkpea

it could be behind the panel or even behind a wee plastic cap

Irish Fire

Normaly a square head with a slot in it it will be at the top left or right could be at the back of the rad.......

clint123

Ok, I found it and I opened it slowly Air comes out, but no water at all.have turned off all other rads, turned heating on, and still only the bottom half of this rad will heat up.

Irish Fire

clint123 wrote: »

Ok, I found it and I opened it slowly Air comes out, but no water at all.have turned off all other rads, turned heating on, and still only the bottom half of this rad will heat up.

You must let all the air out, have a small cloth with you because the water in the rad may be dirty

clint123

Irish Fire wrote: »

You must let all the air out, have a small cloth with you because the water in the rad may be dirty

I have actually just taken the small screw out and let all the air out, but still no water comes out.

Irish Fire

You might need to open the valves at the bottom just to get a flow, there might be crap built up in these valves, close the valves first and take note of how many turns open they are and put them back to this position when you're finished. Don't take that valve out fully because when the water flows it will flow, turn on your heating first just to get the pump working this will help.

Scudges Da

If you have a sealed system you may need to top up the water. Have a look for a pressure gauge on you boiler or in the hotpress, and maske sure this reads between 1&2 bar. If it's lower top up your heating (Normally a valve like this http://www.screwfix.com/sfd/i/cat/74/p4782174_l.jpg)

Hope this helps.

DoneDL

Don`t bleed the rad when the system is hot, make sure that valves are open and that there is sufficent water in the system if it is pressurised