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Hi sorry for your worries, you need to use your voltmeter, and see if there is actually power going to the heater when on ac. I see you have replaced the board and the elements, lets do the troubleshooting as if you have not, also on the board there are a couple of fuses on the circuit board, the glass fuse is for 120vac the flat 5amp fuse is for 12volt, make sure it is good...............test with your voltmeter where the element is connected to the board, see if there is 120vac there when on ac.............Also check the outlet that the refer is plugged into for 120vac, let me know what you find. thanks
when you refer to the + side of the element is your refer 3 way, and are you trying to operate it on dc?
thanks that is indeed the ac element, with your voltmeter on ac, do you see voltage on the terminals to the element?
Double check to make sure there is ac going to the board, check the outlet, then the prongs on the board where the ac is attached, thanks
Do you see ac voltage at the glass fuse ? test against the fuse, and ground
when you put the refer on auto, what does it do? does it switch to gas?
The board is not switching over, as you have replaced it, this can be the wiring to the interior eyebrow, or the eyebrow itself, I am forwarding you the service manual for the refer clickhere
go to 5.8 page 13 it has the testing proceedure
Go back to the circuit board on the back, make sure the wires are correct. mainly the 12volt supply to the board
Quite honestly I am somewhat baffled, the board is good, the heater is good the wire tests good to the eyebrow, and the eyebrow is working properly...........This points towards a bad circuit board......................
I under stand, and saw that in your description, if all is correct from your end, the board is bad..............even new electronics can be bad, seen it many times.................