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My Pyronix PIR (KX10DP-WE) has no sensitivity at low height so I would like to remove the pet filter (we have no pets) as they say you can do in the manual 'removing the pet mask in the lens'. However, I can't work out how to remove the mask. The little screw is covered a transparent...

I have a Honeywell ST7100 central and hot water controller. It has worked fine for years, and still works fine if I select only hot water, or only heating. But if I select heating and hot water then a loud rattling/vibrating noise instantly begins. Switching back to either ch or water stops...