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hi there, i have a honeywell 3 port valve on my system. My question is what should happen if both Ch and Hw are on and then the Ch is satisfied leaving demand for Hw. It would appear on mine that whilst the Hw demand is still called for my radiators get hot. If i just call for Ch or Hw on...

hi guys we have the above fitted on our house which is a y plan system with hw cylinder. The boiler works great the only issue is everytime the ch fires up we get a bass/humming/phone vibrating noise which happens 3 times in a sequence lasting approx 5 seconds, then once the boilers fired...

Hi everyone, Weve just moved into a new house which has a conventional heating and hot water system with a tank controlled by the above. The hot water slider on the 6400c doesn't fire the boiler unless the heating slider is on the 'cont' position. Now this is fine as I understand when a...