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I have installed a mirror in my bathroom; it has built in LED lights that are activated by an infrared sensor.
The mirror is installed alongside a wall cupboard with about a 50mm gap between the cupboard and the sensor. When the mirror is in place, the infrared sensor does not work. But if I move it away from the other cupboard then the sensor works fine.
Bizarre problem - at least it seems so to me. Is it to do with the proximity to the other cupboard? Is it because the other cupboard has mirrored surfaces on the side (I've tried a piece of card over the mirror in case that resolved, but no difference.
Neither seems to make sense!
Does anyone have any insights or ideas? Thank you for any help or advice that anyone can provide.
I may be able to move the sensor to the other side of the mirror, if I use due care, drill a small hole in the metal frame, etc. … …

Pictures or a diagram would help in this instance. As you are there, you can see that of which you mention, we can not, hence the request for pictures.

Hello Mr White,

Thanks for the response. Please see diagram attached. Look forward to hearing from you.

Bruce

A picture speaks a thousand words.

Your sensor is blind.

It can not see because of the cupboard is in the way.

But two things make me wonder.

1) Is the mirror upside down? (Most of the time a PIR sensor is above the item looking down, yours appears to be down looking up)

2) It may be the sensor has the ability to be rotated? (Doubtful, but I am curios)

Thank you Mr White. No the mirror is the right way up, with the fixings it could only go that way, or it could have been landscape - which would of course change the sensors position.
But for form’s sake, I want to keep it portrait, so will have to try and relocate the sensor. There is sufficient length in the flex to the sensor to do this, so I need only drill a new location hole. But of course drilling near mirrors holds some risk of mishap, so I wanted to check my options before ploughing on with that.
Thanks for your help and advice
Bruce