After refilling central heating system.

[beebop]

After cleaning out system with anti-sludge stuff we've now refilled, bled rads several times and fired up boiler. Downstairs rads are all working fine but the upstairs ones remain cold. Why and what do we try now?

 

[traineegasman]

Combi system??? conventional system???? ( tanks in loft) Go mad & give us a clue.....

 

[kevplumb]

err its white

 

[traineegasman]

OHHHH right then, shoulda said.... that`ll be your `howsyerfather ` valve... 200 pounds please......

 

[gazthepottertonengineer]

sounds like you have an air lock in the system try turning all radiators off upstairs by the valves and leave heating on for 30 mins or so that should clear it