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Are all radiators getting warm or hot. If you put your hand on one. how long can you keep it there before the heat is too much to bare

Please excuse my naivety. But how is it plain to you. What do you see that I do not?

OK you were in Guangdong Province http://wikitravel.org/en/Guangdong Where are you now. Are you still in China ?

And fitting modern boilers are a good investment for the future for repairers

Does not matter, restrict flow into radiator or restrict flow out of radiator

Keep it. I have a 23 years old Thorn Apollo which gives brilliant service.£35 on parts to date. A neighbour of mine renewed his 2 years ago for no better reason than it was over 20 years old. His old boiler is now in my garage loft as a source of spares...

I wish you a happy Christmas and a peaceful and prosperous new year. China is a large country, where are you located?

If it is a pressurised system check the pressure at the boiler. After all this bleeding it will probably need topping up. When you are bleeding it .do any of the pipes to the rad heat up

oops;- just picked that up ( brand new house) Don't want tamperings to invalidate any warranty. Its up to you if you want to carry on. Or just replace everything and deny touching it :wink:

Try closing one valve and open the bleeder. has it a good flow. If so reverse the operation ie open that valve and close the other and bleed again to check flow

Shut off all other radiators, then what happens?

Do everything mentioned in this thread. If still not working come back ttp://www.diynot.com/forums/viewtopic.php?t=252821

http://www.diydata.com/projects/centralheating/balancing/radiator_balancing.php

I think this needs to be applied http://www.diydata.com/projects/centralheating/balancing/radiator_balancing.php Regards Bill

Ensure both valves on affected rad are open

It will only take minutes and the rads will not cool down by the time you have completed the check. Then you can turn them back on. Go on give it a go

Have you tried turning all rads except this one off and see what happens?

Are both valves on this radiator open?

Turn all other rads off, leave this one on. What happens then?