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Hi I'm Brian and I'm here to help!
If this wasn't happening with the old thermostat, it sounds like there may be a wire or two wired to the wrong terminal on your new Hunter stat. I'll need a little more info to help you get this corrected. Can you tell me the make and model of your old thermostat and what color wire went to what terminals on the old stat please?
I will still need to make sure your thermostat is wired up right. A wire to terminal explanation will help with that. It's also possible there is two wires that are touching that shouldn't be, perhaps the wire insulation got nicked or something similar. Check the wiring carefully that the wire insulation is intact and no wires are touching that shouldn't be.
That all sounds correct although I can't be sure what that brown wire on E is all about but that may be ok too. So this is exactly how the old Hunter was wired and it worked ok until the thermostat failed?
Remove brown from E and just put a jumper to W@ to E. Tape off brown and retry. Russ
I am Sorry E to W2 terminal tape off brown, Russ
You will need a jumper fromW2 to E after you remove the brown wire for emergency heat to work. Russ