Troubleshooting Buzzing noise on Dimmer Switch, 3-way Switch, 4-way Switch, and AF Breaker all at once.

[LMinMaine]

I have personally had buzzing dimmers, but not to the extent of yours!

I wanted to ask what the 'other switches' are that you mentioned.
Are they also dimmers, because having multiple dimmers on a single circuit/load requires particular compatible hardware.

Are there similar other switches on the non-buzzing kitchen circuit?

The other switches are just a standard non dimming 3-way and 4-way switch.

The non-buzzing kitchen switch is just a single pole switch so no

 

[Avo Mk8]

The other switches are just a standard non dimming 3-way and 4-way switch.

The non-buzzing kitchen switch is just a single pole switch so no

I have to say I don't understand why the 3-way and 4-way switches buzz, unless they are each fitted with some sort of interference supressor with an inductor or similar. Switches of that sort in the UK don't normally have any components other than the switch/contact mechanism, so can't explain why they buzz. They're not illuminated or anything like that?

i don't know what else to suggest other than trying a different spec. and make of dimmer, or getting an electrician in to investigate. You've proven the buzzing goes away when you substitute the dimmer with a normal switch, so to me that's pretty conclusive ?

 

[LMinMaine]

Update:

Installed 300w LED dimmer, still didn't fix the buzzing problem. Home Owner decided to have me remove the dimmer from the circuit to stop the buzzing. Wasn't the solution I wanted for them but this issue was over my head I guess.

 

[Avo Mk8]

Update:

Installed 300w LED dimmer, still didn't fix the buzzing problem. Home Owner decided to have me remove the dimmer from the circuit to stop the buzzing. Wasn't the solution I wanted for them but this issue was over my head I guess.

Thanks for the update, and sorry suggestions didn't help.
The thing that's bugging me is why the light switches, other than the dimmer you replaced, were buzzing.
You might expect the Arc Fault breaker to buzz, and the dimmer to buzz (because they likely have electromagnetic elements in them), prompted by an interaction/incompatibility between lamps and the dimmer, but why would normal light switches buzz?
The only thing I can think of is that the buzzing "normal" light switches did perhaps have some sort of additional feature, eg an electronic element or supressor. I understood they were not dimmers themselves. If they did contain any dimming function that could have explained it.
I guess we'll never know. Very puzzling ?