Maybe one of your mixer valve taps is passing causing the flow switch to act up. Just a guess have no idea. I would call salamander. Im sure they’ll know
I did phone Salamander and played them the noise down the phone, the bloke said he has worked for them for 12 years and hes never heard anything like it !
If not then you know it's something downstream. This is about fault finding and ruling out upstream/downstream as quickly/easily as possible so you know where to concentrate on, you don't know that yet.
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