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I have a Honeywell DU144 bypass valve that does not appear to be seating properly, whatever I do (like changing the setting to 6 Bar and turning the pump to the lowest setting), with the radiator valves fully open, I still get water passing through as it gets hot before the whole system warms...

I recently bought and fitted a Honeywell DU144 bypass valve to my central heating system. When I started up the system I found that the valve got hot quite soon which would suggest that a certain amount of water was already passing through it even though I had all my radiators open at the...