The electrician was a little puzzled with one of the installs as there were four sets of wires coming out of the box; of which one is connected to the central furnace/exhaust switch on the main floor. (ie you press the switch, furnace switches on and one fan on each floor goes on to clear out the house).
I think it is a non-issue as the other buzzing switch has no connection with the house 'exhaust' switch. Despite the annoying sound, the switches still work so I don't think it is a wiring issue. Just the sound is really off putting.
Online reviews say that the Leviton brand of switches aren't the best made; thought I'd see if there is a way to fix the switch instead of swapping it out for new ones.
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