i replaced the switches in my hall bathroom which control the built-in light, nightlight, fan, and heater of my exhaust fan with a pair of SA US22-40 (dual dimmer w/ changeable faceplate) UPB switches, each with a double switch faceplate. i configured the switches to disable dimming (i assume fan and heater are inductive loads), and i'm using the switches built-in timer functionality to ensure the fan and heater get turned off automatically after N minutes.
now that i've got everything wired up, it all seems to work fine, but i've noticed that both of these switches emit a faint buzzing noise all the time. This is different from the typical (and louder) UPB switch buzz that comes from transmitting links.
i have ~30 UPB switches installed in my house, mostly HAI and PCS brand. none of those switches emit any noise when the switches are off, and when they do buzz it's always associated with a UPB transmission. these are the only two SA switches I have installed in my house so i'm not sure if this is 'typical' but searching here and elsewhere doesn't suggest that it is.
has anyone experienced this symptom? is this a sign of a problem with the switches, or my wiring of them, or is this normal?
now that i've got everything wired up, it all seems to work fine, but i've noticed that both of these switches emit a faint buzzing noise all the time. This is different from the typical (and louder) UPB switch buzz that comes from transmitting links.
i have ~30 UPB switches installed in my house, mostly HAI and PCS brand. none of those switches emit any noise when the switches are off, and when they do buzz it's always associated with a UPB transmission. these are the only two SA switches I have installed in my house so i'm not sure if this is 'typical' but searching here and elsewhere doesn't suggest that it is.
has anyone experienced this symptom? is this a sign of a problem with the switches, or my wiring of them, or is this normal?