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Hi my system is a S plan system. No I did not manually latch open the 2 port valve. I was thinking of taking off a small radiator I have downstairs its in a good location so that I can take it off put mains water in one valve side then flush it out on the other valve ?

Hi guys new here please be gentle haha. Right I have drained down my vented central heating system to flush it out with a cleaner. I drained it out from the lowest point on my downstairs radiator opened all the bleed valves upstairs to drain the system down. After draining the system down I went...