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couple of months now. was working fine till that point

I put CH on, on the controller. The HW switch is left off. The radiators will not heat up. I then run the hot tap on the bath. The water is hot. I continue to run this water until it goes cold. The radiators then begin to get warm shortly after. This is the only way i can get the central...

that is with CH on. No heat in radiators till I run the water off

no, they dont start getting hot until i run the hotwater off. I turn the bath on and when the hot water begins to run cold, i stop the tap. The radiators then start to heat up

the lever does not have any resistance when I do what you said

its a honeywell 3 port valve

Thanks for that. How could i test if its working?

Hi, I have a y plan heating system but am not getting any radiators heating up until I've ran off the hot water via the bath. What could be causing this problem please? Thanks