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Smart Home Forum by FIBARO Team

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Humming/buzzing LEDs (no dimmer, double relay)



So, my electrician hooked up an LED mirror on my bathroom.

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Contrary to the specs on the V&B page, it says 38W LED on the back, and that is about the only specs regarding the electrics and LED that is available.

The light seems stable and fine, but the problem is that the mirror emits a rather annoying buzzing or humming noise (when it's on) that changes in cycles. It's not very loud, but certainly loud enough to be annoying. And no, it's not on a dimmer, it's behind a Fibaro double relay.

What could be the cause of this? I can hear the electrician or producer blaiming the Fibaro module, but I can't imaginge why that should be -- it's only an on/off switch? If it's incorrectly hooked up, there would be no light at all?

This is a +1000GBP mirror; hopefully I'll get some input here before talking to the elctrician and/or Villeroy&Boch.


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Have you tried connecting mirror without Relay Switch module? Basically it is only on/off switch and it should not create any noise while hooked up correctly (when current on coil is not too high etc), however in case of any malfunction we need to diagnose all the things. First please make sure the buzz is not produced by mirror itself.

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  • The noise is definitely coming from the mirror (not the Fibaro module -- which is behind the switchplate several meters away).

    No, I have not tried connecting the mirror to power directly. Is it even possible that the Fibaro module could be responsible for the noise?

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