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Yep, bad T-stat. I ended up working backwards, starting with jumping the controller on the heater, which engaged the heater, then removed the T-stat and connecting those wires (turns out it's heat only), then replaced the unit and all is good in the world. Thanks on the assist.

What do the four colored wires (green, yellow, white & red) control? I want to test a thermo in the next few days, and would rather know going in than figure it out as I go...

New to the board... not much to say yet. Jack of all trades, master of labor... New England area, but that could change with the drop a hat