For what you are asking you need a 3 function switch.
Fan heater light wiring.
To wire a fan heater light and night light you will need 5 conductors between the fan assembly and wall control.
As a result these combo units can be complicated to install.
One cable is for the existing heater and the other is for the light and fan.
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This switch will operate a fan heater and either light or night light.
Light heater fans install in the ceiling at the location of the existing fan and operate using switches on the wall.
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.
On the bathroom wall there are three wall switches.
Use a 3 function control to operate the heater fan and light.
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These three in one fixtures work best when wired to a three function switch box allowing for individual control of the unit s functions from a single point.
Combination light heater and fan units can be incredibly handy in smaller bathrooms and other home areas that lack heating and cooling vents.
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In the attic there were two wire cable feeds.
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An electrician deactivates the electrical circuit before you start the job.
This is a 4 function switch.