central heating and radiators

[ben01892]

Hopefully this is a simple and cheap one !

I have a baxi back boiler with 7 radiators running off it. recently the dining room radiator is stone cold all the others seem ok. I have not adjusted any of the rads lately and have tried bleeding this one but seems ok.
If i shut off all the other rads the dining room will warm up , im thinking blockage.

Any help would be great , any things i could try which would help eliminate other problems

Cheers Ben

 

[John506]

So when you turn off all the other rads, and the cold one heats up, what happens when you ppen all the ther rads again?

 

[ben01892]

yeah thats correct , it goes cold again. iv now turned off 3 up stairs and it seem to be warm.

When its cold the pipe on the return side is warm .

Is this pointing to a slight blockage? is it worth taking rad off and flushing?

 

[ben01892]

Anyone got any ideas ?

 

[Hugh Jaleak]

Turn all the others off, put pump on full speed and let it run for a few minutes. If the dining room rad gets red hot, then hopefully any restriction should have been pushed through. Turn others back on slowly, maybe just needs a slight balance to get enough flow to dining room rad. (Balancing instructions in FAQ's.)

 

[ben01892]

not sure what is going on! if i turn down the rads upstairs i can get the dining room one pretty warm but as soon as i open the upstairs ones again i lose heat. Iv now opened up the balancing valve in the dining room to max and still makes no difference. Am i right in thinking build up of sludge sediment etc? Never had to adjust them before.

I brought some fernox and looking at flushing this into the system leave it there for a week or so and then drain .
what do you think?