rad not heating

zetecescort

called to a 2 bed semi to bleed an oil boiler and show new tenant how controls work etc. Got the boiler bled fine and all but one rad (upstairs) heated up fine.

Rad valves open and no air in it, bled it a few times just to be sure. Pressurised system with 1 bar showing on the gauge.

Dtp1979

zetecescort wrote: »

called to a 2 bed semi to bleed an oil boiler and show new tenant how controls work etc. Got the boiler bled fine and all but one rad (upstairs) heated up fine.

Rad valves open and no air in it, bled it a few times just to be sure. Pressurised system with 1 bar showing on the gauge.

Turn off every rad that's heating. Turn off the red wheel valve going into the bottom of the cylinder. Turn on the heating

Walter Becket

Turn off all other rads and close the balancing valve on the cylinder then with any luck the circulation pump will get the rad heating. When you have run the system like this for a while and bled the rad. turn on all the rads. and set the cylinder balancing valve to 1/4 open. Now run the system for long enough to be sure your problem rad. is ok.

Wearb

Did anyone suggest turning off working rads and balancing valve .

K.Flyer

Wearb wrote: »

Did anyone suggest turning off working rads and balancing valve .

Don't think that's been mentioned yet.... oh wait..erm.. maybe :pac:

Car99

Sorry to thread hijack ive a similar issue. where would this balancing valve be located at the bottom of which cylinder?

webpal

Ive the same issue, what's a balancing valve?

Wearb

The valve is usually a normal wheel type gate valve.
When closing it, count the turns. It may work best if you put it back where it was.

zetecescort

Got sorted tonight, thanks for your help

Wearb

zetecescort wrote: »

Got sorted tonight, thanks for your help

Glad you got it working. What sorted it?

zetecescort

just did what was suggested, turned off all other rads and ran the heating for a few minutes and when I bled the rad I got air unlike before. left the heating running a while going back to bleed the rad every few minutes until I got no more air. Turned on all other rads and everyone heated up fine.

webpal

Ok, so I turned off all rads and this one was untouchable it got so hot, lovely job. Unfortunately as I turned back on all the other ones, it progressively got cooler and by the time I got them all on its stone cold again. Anyone come across this?

I should add that's all I've done, should I do the balancing thing?

Wearb

Yes. That is a sign that They need balancing.

The Sidewards Man

zetecescort wrote: »

called to a 2 bed semi to bleed an oil boiler and show new tenant how controls work etc. Got the boiler bled fine and all but one rad (upstairs) heated up fine.

Rad valves open and no air in it, bled it a few times just to be sure. Pressurised system with 1 bar showing on the gauge.

Dtp1979 wrote: »

Turn off every rad that's heating. Turn off the red wheel valve going into the bottom of the cylinder. Turn on the heating

Walter Becket wrote: »

Turn off all other rads and close the balancing valve on the cylinder then with any luck the circulation pump will get the rad heating. When you have run the system like this for a while and bled the rad. turn on all the rads. and set the cylinder balancing valve to 1/4 open. Now run the system for long enough to be sure your problem rad. is ok.

Wearb wrote: »

Did anyone suggest turning off working rads and balancing valve .

K.Flyer wrote: »

Don't think that's been mentioned yet.... oh wait..erm.. maybe :pac:

Car99 wrote: »

Sorry to thread hijack ive a similar issue. where would this balancing valve be located at the bottom of which cylinder?

webpal wrote: »

Ive the same issue, what's a balancing valve?

Wearb wrote: »

The valve is usually a normal wheel type gate valve.
When closing it, count the turns. It may work best if you put it back where it was.

zetecescort wrote: »

Got sorted tonight, thanks for your help

Wearb wrote: »

Glad you got it working. What sorted it?

zetecescort wrote: »

just did what was suggested, turned off all other rads and ran the heating for a few minutes and when I bled the rad I got air unlike before. left the heating running a while going back to bleed the rad every few minutes until I got no more air. Turned on all other rads and everyone heated up fine.

webpal wrote: »

Ok, so I turned off all rads and this one was untouchable it got so hot, lovely job. Unfortunately as I turned back on all the other ones, it progressively got cooler and by the time I got them all on its stone cold again. Anyone come across this?

I should add that's all I've done, should I do the balancing thing?

Wearb wrote: »

Yes. That is a sign that They need balancing.

Rads need balancing.