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Wiring a Bathroom Exhaust Fan Light Combo

How to Install Wiring for a Bathroom Exhaust Fan – Bathroom Exhaust Fan Heater Electrical Wiring – The white neutral wires would be tied together at the wall switch box. Understand that this is a typical wiring scenario, however the actual wiring connections may be different for your specific unit.


Switch Wiring for a Bathroom Exhaust Fan light Heater Combo

Bathroom Exhaust Fan: Hey Dave. I am taking out a fan and light combo and I’m replacing it with a fan,  light and heater.

  • I have 12/3  and want to know were do I put the commons?
  • I have a rocker switch for the fan and light and I want the heater on a timer switch I want to make sure I am doing this right.

Thanks Stan

This electrical question came from: Stan, a Handyman from Mishawaka , Indiana.
See more about Home Wiring for Indiana

Additional Comments: Love the site and tips.

Dave’s Reply:
Thanks for your electrical question Stan.

How to Install Wiring for a Bathroom Exhaust Fan

Bathroom Exhaust Fan Heater Electrical Wiring

  1. If the power source is at the wall switch then the commons or neutrals tie together and are not switched.
  2. If the 12/3 has been installed between the wall switch and the combo unit then because this combo unit has three switched functions then you will need an additional 12/2 cable installed.
  3. The wiring  could then be where the black wire of the 12/2 could be for the heater function, which would be controlled by the timer switch, and the 12/3 could be wired so the black wire is for the light and the red wire is for the exhaust fan.
  4. The white neutral wires would be tied together at the wall switch box. Understand that this is a typical wiring scenario, however the actual wiring connections may be different for your specific unit, especially at the unit connections as well because some units have built in heat sensors which control fan operations to prevent the unit from overheating.
  5. It all depends on the specific bath exhaust fan and light combo unit you choose, so you must consult the installation manual and wiring directions.
  6. You may also see that the unit requires a dedicated circuit depending on the type of heating system the unit uses.

The Following Resources will assist you with your Bathroom Exhaust Fan

Wiring a Bath Exhaust Fan
Bath Exhaust Fan

Bathroom Exhaust Fan Wiring

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Wiring a Light Switch – Diagram 1

Wiring Diagrams

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