Bath Light/Fan/Heater confusion

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Old 11-30-13, 11:49 AM
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Angry Bath Light/Fan/Heater confusion

I am installing an add-on bathroom light/fan/heater. There is a vanity light fixture controlled by a switch. I want to add 2 switches in a 3 gang box, 1 controlling the new light/fan, and the other, the heater. There is already power to the switchbox for the existing vanity fixture. I have pulled 2 new cables of 12x3 from the switchbox to new light/fan/heater containing 1 black, 1 red, 1 white, 1 gnd. I am having problems getting the new fixture to work with the 2 new switches. Can someone please walk through the connections at each end? I thought I knew but obviously I don't. So far, I have spliced the blue (light), and the black (fan) from the fixture so that the same switch runs both and I have connected all neutrals at each end. Any help would be greatly appreciated. Thank You!
 
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Old 11-30-13, 12:17 PM
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Welcome to the forums!

You need to connect the red to the heater lead in the fan/light/heater combo, and red to the 3rd switch in the switch box. You also need to feed the 3rd switch with the hot wire in the switch box.

Not sure what you are going to do with the 2nd 12/3 cable as it is not needed.
 
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Old 11-30-13, 12:24 PM
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If you are going to have the fan and light on the same switch you only need one 3-conductor cable however since you ran two cables I'd sugest a duplex switch for the fan and light and a sinplex (single switch for the heat. If you do want to put the fan and light on the same switch then the wiring would be:
Switch:
  • Power in black pigtailed to all switches.
  • Whites connected to each other.
  • Vanity light black to same switch it is currently on.
  • Black of 3-conductor cable to new switch "A".
  • Red of 3-conductor cable to new switch "B".
At the new fixture:
  • All whited together.
  • Black to heater "hot" wire.
  • Red to light and fan "hot" wires.

Above assumes four wires not counting ground from the new fixture.
 
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Old 11-30-13, 12:33 PM
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Thanks for the fast reply. I had a feeling I didn't need the second wire. So if I understand you correctly, I will be using the black wire as switch leg for switch 2, (light/fan), and red for switch leg for heater on switch 3, with jumpers for power feeding switches 2 and 3....am I correct?

Thanks so much!
 
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Old 11-30-13, 01:05 PM
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You are correct.
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