new rads have cocked up my system. Help needed!

[edge]

I had a small downstairs extension built which included two new rads. My system was all 15mm piping and the two new rads were reduced to microbore. after initial bleeding the two new rads all seemed to work O/K
I then replaced one of my old rads, again downstairs, with another new one, again reducing to 10mm microbore. The new rad burst into life but one of the other new ones in the new extension remained cold. I bled the rads with the pump off and eventually all the new rads seemed to be working. However, the next day I had the same problem. And now some of the other rads in the house are not getting warm. The system seems to be hit and miss everywhere now.

 

[Rico99]

Souunds like it just needs balancing properly, look in the faqs or wiki

Rico

 

[Nige F]

I had a small downstairs extension built which included two new rads. My system was all 15mm piping and the two new rads were reduced to microbore. .

Why. it`s horrible problem causing stuff

 

[muggles]

Change the hideous 10mm to proper 15mm so it matches the rest of your house, then balance the system as per the FAQs