Single Cold Rad after flushing

[Reebo]

Hi, I have a single cold rad downstairs, I've flushed all the gunge out of it and system has had inhibitor over last year. All other rads work Fine and seems to get hot at copper pipes either side.

If I switch all majority of other rads off then it works fine.
When the rads off water runs clear from both feeds although appears 'foamy'
it did work fine beggining of last winter but got progressively worse. Could it be gunge in the rest of the system, an air lock or low pressure?

Any advice for clearing an airlock or good chemical for clearing gunge from the system?

Many thanks

 

[seco services]

If I switch all majority of other rads off then it works fine.

is the system balanced ?

 

[Reebo]

I guess it must have been balanced in the past as it definately worked fine for the previous 3 years before late last winter when the problem started happening, is there a way to check this? Or is this not straight forward?

 

[seco services]

. is there a way to check this? Or is this not straight forward.?

 

[Reebo]

Many thanks that sorted it out, was quite obvious once done but not had to balance the heating system before. Really appreciated as got it working just before the cold spell we're going though now.