If the fan comes on in Auto, thats a good thing, same if the cooling come on when put to cooling.
At the unit turn power off and remove and identify thermostat wires. Put a jumper wire between R an W or W1. Restore power, heat should come on.
If not,were there any wires attached to w or w1 before you started, if yes then you need to make sure the same wires and color are hooked up to same terminals at thermostat.
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