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Can anyone help have drined system to fit another rad and add fresh fernox, all rads are working fine including new one except one upstairs have bled several times, tried shuting off all working rads to force airlock out this is on a 10mm microbore system

Can anyone help have drined system to fit another rad and add fresh fernox, all rads are working fine including new one except one upstairs have bled several times, tried shuting off all working rads to force airlock out this is on a 10mm microbore system

No, the radiator has been cold ever since. Any more ideas anyone?

Most of the other rads went cold, but at least one stayed hot i can only think the seats on the valves were not sealing correctly, but the other rad was still cold

yes there is a valve at each end

Not sure what you meen by twin entry? they are standard rad taps 10mm

The new radiator is working fine. Its an old radiatot that we cant get working. We never had any problem before we drained the system

Any advise would be welcome. We've got a 10mm microbore central heating system. Completed drained system, tapped into plumbing to fit new rad. Refilled system, with new Fernox. All other radiators are hot, and fine. However one small radiator in en-suite will not get hot despite bleeding...