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Took the plunge and replaced the boards. Ice maker appeared to start running. Went to bed. Got up to water all over the floor and a freezer full of icicles. No ice cubes though. Ice maker is full of ice and fingers are not in the same position. I think I'll go to work and see what I come home to!
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Ice maker quit. Optics pass double-blink, on solid with flapper closed test. Pulled ice maker and checked L - N voltage. 0 volts. Unplugged ice maker and checked black to white voltage. 110 VAC. Plugged the ice maker back in. Checked voltage across black and white - 0 volts. I assumed that meant the relay is bad on the control board? Then I removed the board to check the connections, tapped on the relay case - assuming it is in-fact a relay. Put the board back in. Still passes the blink tests, but now I've got no voltage at the black and white.
P.S. Already repaired a burned board 2-1/2 years ago (smoked trace), then replaced both boards maybe 2 years ago along with the ice maker. Ice maker still tests okay. Water valve is okay, pipe's clear and water runs into ice maker if I jump the valve. Quality unit this KitchenAid. Not. 55 year-old GM Frigidaire stills runs great.
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