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Hi, I'm Mike G and I'll be assisting you. The fan light heater may have been wired with 2 two wirecables and one has the hot and the other wires are switch leg back to the unit. Find the hot, 120V to ground, then touch each of the other wires to it to verify my assumption. Let me know how it goes.
With the loose wires, touch each to hot wire to show what they operate.
There should be another wire. If they used 2 two wire cables, that is 4 wires. 1 hot, 1 fan, 1heater, 1 light.
I can only comment on what it should have been. The only thing, under the circumstances is to check in the unit to see how it was wired there. Sorry if that isn't definate but that is all I can offer. The picture of the old switch show the jumpers to power the individual switches. The new one doesn't require jumpers. You must have had 4 wires connected to the old switch.
It was a white wire used for a hot. It should have been marked with black tape.
No don't do that. Look to see which one is paired with one of the black wires. That should be the one. Too bad you attached it not knowing it's function.
Just visually look to see which white enters the box with one of the blacks you know operate a function. You can ring it out but if you do as instructed it will be faster.
Let me know how it goes.
That's what I figured. It's done that way, but the wire needed to be marked.
You're welcome, Glad to help.