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No work done - just switched on again after the summer - suspect your right and its an airlock but not sure how to deal with it. After reading previous postings tried shutting off working rads and setting pump to max. This seems to have cleared some of the upstairs rads one by one, but one of...

Help....all but one of downstairs rads working - upstairs rads all cold except one. Open GCH with 6 rads downstairs & 7 up. Baffled.. any suggestions please chaps?