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It sounds like you're talking about two different things here, you say the compressor runs on and on and you say when the circuit board on the dispenser is unlocked it either keeps dispensing water or ice depending on which is pushed correct, that problem is going to be the switch (microswitch) on the dispenser yoke assembly. You can see the white microswitch on the right side, as far as the compressor goes this is a whole different issue they are not related, if you move the food in the freezer out and look at the back panel is there any Frost on it?