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My name is Billy.
Is the 17 v measured off the wires while hooked to the board or off?
Can you measure the wires unhooked to see if something is draining or if the input is low?
From the transformer
What if you remove the contactor wires outside..do you get 24v going to the contactor?
Also if you turn furnace disconnect off does contactor remain down
Ok, is this an ac or heat pump?
if you unhook the 2 wire from the unit that comes from inside...do you read 24v unhooked?
unit = ac unit
Ok, so with thermostat wires on board (r,g,y,w) unhooked...what do you have terminal R to C?