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BarbWhite
Bathroom fan heat lamp

I followed the wiring instruction from a new bathroom fan with a heat lamp. The old one worked with two switches. One for the fan and one for the heat lamp. After installing the new one this is what it does.
When I turn on the switch for the fan, the fan works and the filament in the heat lamp glows just slightly.
When I turn on the switch for the heat lamp, the lamp turns on normally.
When I turn them both on, only the heat lamp comes on.
What could be wrong?

Fencepost
Re: Bathroom fan heat lamp

It sounds like you have the white wire to the fan connected with the black wire to the lamp and the wire from the lamp switch.

You should connect all three white wires together, and only the wire from the fan switch to the black wire to the fan, and only the wire from the lamp switch to the black wire to the lamp.

In some units, especially older ones, all the wires may be black. In that case, one wire to the fan and one to the lamp should connect to the white wire coming from the switch. Then the wire from the lamp switch connects to the remaining wire to the lamp, and the wire from the fan switch connects to the remaining wire to the fan.

The diagram below represents how it should be wired.

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