@dpetersen954 The problem is you do not have a neutral. The power is at the light fixture, and that is where the neutral is.

@timoniumI think you would need a electrician to fix what’s there.

@timonium Sounds like light2 wiring is the problem. Disconnect wiring for light2 at light1 box,cap wires label do not use. Do the same at light2. Run new wire from light1 box to light2.

@RajaIndra That is a 3way switch. You would need to use the HS210 to replace that if you have a neutral in the box(the white on the switch is not the neutral). Check the other 3way switch that...

@timonium Then some how you have the output(load) of the dimmer connected to circuit B.

@timonium Do the devices on circuit B work normally when circuit A is off?