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3 of my 6 downstairs radiators downstairs are not heating up because of blockages - other 3 are fine. I have tried Fernox F3 cleanser but it has had limited effect - bringing some heat up to TRVs to 2 of 3 rads. My open vent system (Ideal Classic standard boiler) uses 8mm microbore and I have...

I have just drained my heating system but when I started to refill it, the header tank filled up and then stopped when the water level had reached the pre-set point for the ball valve. The rest of the system is not refilling (probably caused by an air lock between the header tand and the...