Machine freezes and doesen't drop the ice down to the bin

I didn't think their smaller units had a curtain, but it is referring to the plastic shield that hangs in front of the ice making grid or evaporator. This must be closed for the unit to run and there is a magnetic reed switch located on the bottom right hand corner of the curtain to prove that it is closed. Actually the magnet is in the curtain and the reed switch is snapped into the side of the grid. Make sure the curtain is in place and the magnet has not broken off. If that is in tact look to see if the reed switch is in tight. IF YOU DO NOT HAVE A CURTAIN... some units had a small plastic flapper at the bottom of the grid that was activated whenever ice dropped. Same system though with a magnet and reed switch. The magnets on some of these curtains and flappers were just surface mounted with some kind of adhesive and others have it captured inside of a plastic pocket made into the curtain. So if you don't see a magnet look for a spot where it used to be. If you want to prove this is the problem just get a magnet and hold it up to that spot for about 10 seconds and see if the unit cycles on. You will then have to order a new curtain or flapper or attach a magnet to the broken spot somehow.

check the ice thickness sensor may need to be cleaned or replaced. this is what causes the machine to go into a harvest only

Time to give it a good cleaning. If you use the wrong cleaner on the plate, it etches it and causes the cubes to stick.

Very unusual for one of these to not stop. There is a magnetic proximity switch located on the bottom right side of the water curtain that serves to both cancel a harvest/drop and to shut the unit down on a full bin. When a drop occurs the control board sees a open and then close of the switch and restarts a freeze mode. If the ice drops and the bin is full the curtain is blocked by the ice behind it from closing again and the unit shuts down on a full bin indication. If the curtain does not open and close after 3 hours it would lock the unit out. Therefore I assume that the switch and the board are working. Most likely you either have the unit on a non-Manitowoc bin or are missing a deflector plate in the Manitowoc bin and the ice is falling out of a service door.

DO THE BASICS:
Change the water filter
Add ice machine cleaner and go by the directions.
What should be kept clean?
There are 5 things to keep clean:
1. The outside cabinet & door.
2. The ice storage bin.
3. The condenser.
4. The ice making system.
5. The ice scoop.
The ice storage bin should be sanitized
occasionally. It is usually convenient to sanitize the
bin after the ice making system has been cleaned,
and the storage bin is empty.
A sanitizing solution can be made of 1 ounce of
household bleach and two gallons of hot (950F. -
1150F.) water. Use a clean cloth and wipe the
interior of the ice storage bin with the sanitizing
solution, pour some of the solution down the drain.
Allow to air dry.

How to clean the condenser.
The condenser is like the radiator on a car, it has
fins and tubes that can become clogged. To clean:
1. Remove the kickplate.
2. Locate the condenser surface.
3. Vacuum the surface, removing all dust and lint.
Caution: Do not dent the fins.
4. Replace the kickplate.
Winterizing
1. Clean the machine as explained on the next
page.
2. Turn off the water supply.
3. Drain the water reservoir. See page 24, Spray
Pump Repair and follow the instructions to remove
the pump hose (step 2, bottom hose only).
4. Disconnect the incoming water line at the inlet
water valve.
5Remove control box cover and turn the timer
into the harvest cycle.
6. With the machine operating, blow air through
the inlet water valve; a tire pump could do the job.
7. Drain pump models should have about 1¤2 gallon
of RV antifreeze (propylene glycol) poured into the
ice storage bin drain.
Note: Automotive antifreeze must NOT be used.
8. Replace control box cover. Switch off and
unplug the machine.

CUBE ADJUSTMENTS
There are three items that may be adjusted: Cube
Size, Harvest Time, and Bin Level. Note: Cube
Size and Harvest Time adjustments should only be
done by a qualified service person.
Cube size control.
The cube size control should only be adjusted to
bring the cubes to the correct shape, the overall
size cannot be adjusted. Try to adjust the cube
size control when the ice machine is in the harvest
cycle, or in the first 10 minutes of the freeze cycle.
1. Open the door and remove the control box
cover.
2. Locate the cube size adjustment screw, and to
make fuller cubes, turn the screw clockwise about
1/4 turn. This will make the freezing cycle longer.
3. To shorten the freezing cycle and make cubes
that are not as full, turn the adjustment screw 1/4
turn counterclockwise.
4. After the next freezing cycle, the cubes should
have responded to the adjustment, if another
adjustment is required, do it early in the freeze
cycle.


Diagnostic Codes
Code Description
F - - - - - - - Freeze Cycle
F flashes- - - - Freeze Cycle is Pending
H - - - - - - - Harvest Cycle
H flashes- - - - Manual Harvest
b - - - - - - - Bin is Full
C - - - - - - - Clean Cycle
L - - - - - - - Board Locked
d - - - - - - - Test Mode
O - - - - - - - Off
E - - - - - - - Self Test Failed
1 flashes- - - - Max Freeze - Retrying
1 - - - - - - - Max Freeze Time Shut Down
2 flashes- - - - Max Harvest - Retrying
2 - - - - - - - Max Harvest Time Shut Down
3 - - - - - - - Slow Water Fill
4 - - - - - - - High Discharge Temp
5 - - - - - - - Sump Temp Sensor Failure
7 - - - - - - - Discharge Temp Sensor Failure
8 flashes - - - Short Freeze - Retrying
8 - - - - - - - Short Freeze - Thin ice
All 4 Upper Lights Flashing - Unit Remotely Locked Out

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It is a set of eyes located in the very back right and left hand side where the ice drops into the bin. Take some ice machine cleaner and wipe down the eyes. You should be able to pull the holders out to get to them better.

descale bin level sensors, check for corrsion on wire harness. if does nt work. replace . bin level sensors

The thickness probe should be approximatly 1/4 inch off of the evaporator.Sounds like you might have loose grids on the evaporator.turn the unit off and remove the curtain.use a flash light and inspect the grids.There should not be space in between the joints,if there is the ice will freeze behind the grids and not properly release when in harvest. Also gently pull at the grids,if they pull towards you or wiggle then they are separating. I have removed one of the grids and had the unit continue to run for sometime until the evaporator could be replaced.The plating being spotty causes release issues as well.Finally check the level of the machine,front to back and side to side.Not being level will also cause release problems

If water is standing in the bin the drain is clogged. If water is raining down into the bin, Machine may not be level or the drain on the ice machine maybe partially clogged. If machine freezes up water will rain into bin too. Water fills ice machine while in harvest and continues to fill until ice machine`s suction reaches 49 degrees and the defrost timer times out.(usually 1-3 minutes after suction line reaches 49 degrees)

The bin control shuts it off when the ice bin is full. Without a bin control it should keep making ice and never stop.