On Sun, 19 Dec 2004 23:16:25 UTC, Grunff wrote:

Georgiegirl wrote:
2 weeks ago I put some cleaning stuff in my radiators. Today I drained
and refilled the system and now 2 of my rads don't work. I have a
Potterton Combi 80 boiler running 5 rads.

Most likely you have an airlock. You can usually (but not always) clear
it by shutting off all rads but one (of the two cold ones), thereby
forcing water throught that one. Then repeat for the other cold rad.

And temporarily (if it's obvious how) turning up the pump speed. But
reset it afterwards!
--
Bob Eager
begin a new life...dump Windows!