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Electrical Wiring in the Home/Wiring a new bathroom fan/heater/light


We bought a new fan/heater/light unit to replace a similar existing one. The wiring diagram shows there needs to be one wire coming from the switch with 2 wires (black, white, and ground) and one wire from the switch with 3 wires (black, white, red, and ground). When we removed the old unit, there is only two 14/2 wires (black, white, and ground) coming from the switch. Since there is no red wire coming from the switch, we cannot figure out how to wire it. By following the included wiring diagram, it leaves one wire in the new unit with nothing to connect to. Is it possible or do we need to fish a new 14/3 wire through the wall to the switch?

Was there a heater there before?

With only a black and a white, the light heater and fan would have to come on the same time.

You need a white and a ground to operate anything.  Then you need one more black or red wire for each switch you want.  So, if you want 3 switches, then you need 3 black or red wires and a white and ground wire.
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Electrical Wiring in the Home

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Bob Sponaugle


Just about any home wiring question. (not appliance repair) I have done all kinds of home wiring for myself, including adding a new breaker box, etc. Please, questions from North America only. Please be specific with details.

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