Does not go into harvest

The water runs over the evaporator coil(plate) until the ice gets thick enough, than when the ices touches a switch for the thickness you have it set for, it to go into harvest and the hot gas from the liquid line goes through the evaporator making the ice fall. If you are not making ice, it is the refrigeration system not working, so check the refrigerant, compressor etc like you would on any refrigerator or freezer

Is the machine producing ice thick enough to come off the evaporator plate? the machine will try to harvest 3 times before it locks out on long harvest. Harvest cycle: The compressor and hot gas valve are both powered during the harvest cycle. The fan and pump are off at this time. The machine stays in the harvest cycle until the evaporator thermistor senses 52 DEG F. If the bin is not full, the unit goes into another freeze cycle. I would check the Thermistor

Remove the ice thickness probe that is hanging at the top of the evaporator plate and clean really good put it back push the freeze tab. If the ice is still getting to thick and not causing the machine to go into a harvest then replace the probe , make sure when you do this to set the thickness by using a 1/8 inch drill bit, lay the bit flat between the evaporator plate and the probe turn the 1/4 screw in or out to achieve the 1/8 inch. The probe is what sets the machine into a harvest, if the ice is not building up enough to cause the water to come into contact whit the probe long enough then it will not go into a harvest. if the ice is getting to thick and the water should be running over the probe it should have went into a harvest if not then the probe is not sensing it to tell the CM3 to go into a harvest.

look at the evap plate to see if there is a ice thickness probe, if there is it should have a screw 5/16 going through it that you can turn in or out you wont the thickness of a penny between the evaporator and the stainless sensor turn screw 1/8 of a turn at at a time let machine make a sheet of ice and keep making adjustments until you achieve the right thickness. Now if there is not a probe then the thickness is built in the run time of the control board. you can not adjust it. you need a tec to look at it to make sure your not having a harvest problem if it is not harvesting every time them ice will be to thick.

Replace the ice thickness sensor hanging on the front of the evaporator plate. when you turn the power off and back on factory default is to go to harvest first. if the ice thickness sensor dose not sense the ice is thick enough then it will not go into a harvest. before you replace the sensor take it loose from the evap plate and drop it into the water sump tray if it goes into a harvest then replace the board. if not then replace the sensor.

First is the ice to thick coming off of the evaporator plate? If so then you need to adjust the ice thickness probe located at the top of the evaporator plate it is white with a 1/4" screw going through it, turn if left an 1/8" at a time let it make ice and check each batch. Now for chunky ice is it melted together? If so then make sure the machine is not dumping water into the bin during harvest if it is then check the dump valve to make sure it is opening during harvest cycle.

The machine will try to harvest 3 times before it shuts the machine down. Is the ice thick enough to open the curtain door? if the curtain dose not open the magnet switch then the machine dose not know it has harvested the ice and will keep trying to harvest. Is the ice coming off the evaporator plate during harvest or is it hung on the plate? if hanging on the plate then system needs to be cleaned. is the harvest assist plunger working?

Likely cause,
1. Ice bridge thickness too small, not enough ice to open curtain.
Solution, Check and adjust if needed.
2.Ice bridge thickness too large, ice frozen to evaporator frame.
Solution, Check and adjust if needed.
3. Purge valve dose not open, water melts ice bridge, not enough ice to open curtain.
Solution, Check purge valve.
4. Incomplete ice formation.
Solution, check water distribution for partially plugged holes.
5. Curtain out of position.
Solution, check curtain for swing restriction.
6. Curtain switch dose not open when curtain does.
Solution, Check switch with ohmmeter.
7. Machine in very cold ambient area.
Solution, Move machine to warmer location.
8. Hot gas valve dose not open.
Solution, Check hot gas valve, check controller using test mode.
9. Harvest assist probe out of position - ejector pin not retracted.
Solution, check harvest assist mechanism-spring should retract pin.
10. Damaged evaporator.
Solution, Check evaporator surface now would be a good time to make sure evaporator plate is not dirty this will cause ice to hang up on evaporator plate also check plate to make sure all cross points are not loose.
11. Fan motor stays on during harvest.
Solution, check controller using test mode.

Pull the front cover and see what error code it is locked out on. sounds like long harvest. if so it will try 3 times to harvest and the it will lock out until you power the unit off and then back on. check the ice thickness sensor hanging on the front of the evaporator plate. pull if out and clean it really good put it back and check the distance between the plate and the sensor with a 1/8 inch drill bit you can achieve this buy screwing the 5/16 screw on the sensor in or out. start machine up watch as it makes ice. watch the board you will see a spot marked harvest ready it will blink on and off while water comes in contact with it. It will come on and stay on when water is in full contact with it for about 1 minuet then it should go into harvest and dump ice. If the light never comes on and you can see the water is flowing over the sensor then replace the sensor.

If it is going into harvest but the ice is to thick causing it to stick and not letting it drop then you need to adjust the ice thickness sensor it dose not need to be no more distance than 1/8 of an inch between face of sensor and evaporator plate you can use a 1/8 drill bit flat between sensor face and ice plate use a 1/4 nut driver to adjust the sensor.