My sears whirlpool model 106.50592000 mfg in 2000 side-by-side refridge icemaker wont stop making ice. It has the optical shut off not the wire bar. When I slide the manual shutoff switch that blocks the infared signal to the receiver it doesnt stop the icemaker as it has in the past. I normally keep the manual switch closed as I dont use that much ice and dont want to make more than a half bucket at any time. Anyone know what component is at fault and what I need to replace? Thanks