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Apologies for the delay but I got this fixed just few days ago (along with other things) and basically the plumber has replaced the bypass tube/valve (I'm unsure on the correct word here) with another and that noise disappeared! Once again, thank you for all your replies, they were all useful...

Unfortunately I did test the heating only after replacing the thermostats, but I doubt they have anything to do as they're wired exactly in the same way as the old Danfoss ones. Someone from the builder came today and told my wife they're going to replace the T joint on the bottom right hand in...

I'm adding two photos of the system, wondering if the tube below is the bypass? https://ibb.co/g0udZK https://ibb.co/bWgsuK

Forgot to say thank you all for the responses!

This should be a 2 port valves, but I feel like they went "cheap" still. I have changed the thermostats from the original Danfoss, I just hope they will not make a big noise about that, but I guess it's the way to go. I have made a video about the sound:  I have an Ideal combi boiler and...

Hi, in my new home I have a couple of Danfoss hpa2 valves that I believe are used to separate the heating of the master bedroom with the rest of the house. I have two Tado smart thermostat that are working with the system. However, whenever I hear the Tado's relay switch off the heating as it...