There's a fuse in there, different locations on different unit's. I'f it's blown the board won't have power. You said Tou used the emergency electric heat. Occasionally my unit will pop the fuse if we accidentally switch the thermostat to electric heat. Kill all power and pull the cover and poke around for the fuse.
If you have everything on and push the 24v connector outside does the outside unit come on?
If you have everything on and push the 24v connector outside does the outside unit come on?
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