Picked up a used CCU, plugged it in and still can't get the fan to turn off. It is basically stuck on "auto" . Can turn on HI but hit the off button and the damn thing won't turn off. Arrgh!

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"Opportunity is missed by most people because it is dressed in overalls and looks like work" - Thomas Edison-
1979 300SD
1975 450SL
2014 Ram Cummins Megacab (tow rig)