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Yes it’s def a Honeywell one I’ve just not taken the blue sticky cover off the box that’s all. It doesn’t bang all the time it seems to be when bump kicks in and valve is changing over

No pump is fitted right way

I’ll take actuator off In morning and try it. Let you know what happens

I’ve changed the whole head and actuator…. Before I’ve fitted 2 new actuators left old body it’s been fine. It’s only started doing it since o fitted whole new body etc. when I changed actuator before if I turned pump on without actuator fitted and manually tried to move valve it banged across...

I Haven’t bled anything and I think the tap valves either side of pump were inky half open before. I’ve opened them fully since fitting new valve. I’ve taken the old actuator off old body before (new one fitted ) and if I slam open the valve with pull running it’s exactly same noise

Yes certainly sounds it. When I turn heating on at switch it bangs after a few seconds while pump and valve shake

Need help. I have just fitted a new Honeywell mid position valve and now I get a loud bang coming from it when hot water or heating comes on. B is going to the hot water tank A to the rads. what can be causing this and can it be fixed