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First let's look through the different service manuals. CM3 Water level sense diagnosticsDOWNLOAD Head Pressure Control Kit - CM3DOWNLOAD Reduce Air in CM3 ModelsDOWNLOAD Replacement of the CM3 controllerDOWNLOAD Service Handbook to 2007 - CM/CM3DOWNLOAD . I am here should you have any questions, Thanks John Tripp Appliance 911
The bin sensor eyes need to be cleaned or replaced. First remove the front cover then remove the white plastic ice deflector shield. Now you should be looking at the evaporator plate look down you will see the water sump tray full of water in that tray is a black plastic grate that when the ice is harvested it drops and hits the tray keeping it from falling in sump tray PULL it OUT. now just behind the sump where the ice falls through opening on the left and right sides is where the ice full bin eyes are you can pull them out side ways there is plenty of wire so you can pull them up to where you can clean them with a soft cotton cloth with scotsman cleaner. Now for a manual goggle scotsman service manuals you can get a PDF file.
clean the ice sensor on either side of the ice platen and just past the water trough. gently pry the sensor on each side out of their plug and work wiring out until you can get to the two led lights and clean scale off. limestone scale builds up and blocks the sensors.
there are lens on the bin that shoot a beam across if there is ice it stops the beam and tells it's full. It can also become covered with calcuim and also tells the bin it is full. I would clean these lens gently with a cacium remover. they make products for this. its like an acid that clean off the calcium without damaging your lens.
These units have a real problem with the bin controls. I can't begin to tell you how bad. There are two - for lack of a better term - paddles - that are basically just pushed into the left and right side of the drop area that have small lenses in them with a low level beam that when broken indicates a full bin. You have to reach in from under the bin opening and feel to the left and right, pull the paddles toward the middle and there should be enough slack on the wires to get a good hold of them and clean the lenses with a Q-tip soaked in grapefruit juice. Pop them back in and try them - if that doesn't work (and sorry but most of the time it doesn't) then they will have to be replaced.
Thank you for following up with me. The machine works fine now. I should not have sent my message under the category of "similar problem" since I had already fixed it. My solution was simply to gently pull the sender and receiver units out, give them a good cleaning, and put them back in. Each unit looks like 2 LEDs attached to the end of a black plastic holder about 4" long. There were no screws to deal with. I just wiggled the plastic holders out, then back in. They are located (in the case of my machine) at the forward and rear ends of the narrow drop slot which leads into the ice holding bin below (as if to aim a beam across the length of the slot. A hand will have to be inserted an inch or two up into the drop slot to feel them along the wall of the slot.