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Thanks; The rads are adjacent (bedroom & en suite). I've tried your first suggestion, how else do I clear an airlock please?

I would very much welcome any advice before having to call a plumber out; my problem is I have 2 rads (bedroom & ensuite) that won't heat up and I have exhausted my knowledge. I have carried out the following fault finding in an attempt to identify the problem but to no avail: With both rads...