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The unit makes ice but does not go into harvest mode

I (service shop) replaced the thermister 14 months ago. That seems to be the problem as it does not seem to sense when it should cycle into harvest. Do not beleive my evaporator needs cleaning as water continues to pour over the ice slab.

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I have a Manitowoc J series and it will run three cycles and then shut off. I will start again and the same thing happens. everything else seems to be fine.


Chances are the unit is shutting down on an error code. It will shut down after three batches if either A: the unit takes too long to make ice, or B: a harvest cycle lasts too long. You can time a batch of ice with a timer or stopwatch... if you listen you should be able to tell when the "ice making" stops and the "harvesting" begins. Ice making should take about 13-15 minutes and harvesting 1.5 to 2.5 minutes. If I remember correctly the error codes are triggered if the ice making takes 60 minutes or longer and/or the harvest takes 3 minutes or longer. You can tell which error code is tripping by accessing the electronic control board. There is an LED indicator that will blink when you turn the unit on if there is an error present in the memory.

Oct 25, 2014 | Kitchen Appliances - Others

1 Answer

Ice maker not producing any ice and need help


Have you tried turn it off and totally defrosting the unit. Sometimes the ice making mechanism leaks a bit of water where it shouldn't and it just frezes the mecahanism.

Oct 11, 2014 | Marvel Appliance Ice Maker

1 Answer

Why my scotsman ice machine goes off on the refridgertion light


This could be several things. This means it has tried to harvest the ice 3 consecutive times before the machine has locked out.
1. Likely Cause, Ice bridge thickness too small, not enough ice to open curtain. PROBABLE SOLUTION, Check and adjust if needed.
2. LIKELY CAUSE, ice bridge too large, ice frozen to evaporator frame. PROBABLE SOLUTION, Check and adjust if needed.
3. LIKELY CAUSE, Purge valve does not open, water melts ice bridge, not enough ice to open curtain. PROBABLE SOLUTION, Check purge valve during harvest.
4. LIKELY CAUSE, incomplete ice formation. PROBABLE SOLUTION, Check water distributor for partially plugged holes. The machine needs to be cleaned and sanitized every 6 months.
5. LIKELY CAUSE, Curtain out of position. PROBABLE SOLUTION, check curtain for swing restriction.
6. LIKELY CAUSE, Curtain switch dose not open when curtain does. PROBABLE SOLUTION, Check switch with ohmmeter if bad replace.
7. LIKELY CAUSE. Machine in very cold ambient. PROBABLE SOLUTION. Move machine to a warmer location.
8. LIKELY CAUSE. Hot gas valve does not open during harvest. PROBABLE SOLUTION. Check hot gas valve with a volt meter during harvest mode to see if you are getting correct voltage to it. If not then replace control board . IF yes and valve is not opening then replace valve.
9. LIKELY CAUSE. Harvest assist probe out of position - ejector pin not retracted. PROBABLE SOLUTION. Check harvest assist mechanism - spring should retract pin.
10. LIKELY CAUSE. Damaged evaporator. PROBABLE SOLUTION. Check evaporator surface. Make sure the plates where they intercept each other is not loose this will cause ice to hang up. check to make sure the nickel is not peeling off, if so then the plate will need to be replaced.
11. LIKELY CAUSE. Fan motor stays on during harvest. PROBABLE SOLUTION. Check controller using test mode. If this dose not help you then give me the model number so i know what machine you have.

May 28, 2014 | Scotsman Ice Maker CM3 30inW Cubed Ice...

1 Answer

Sce170a-1a wont harvest


This machine has a cube size control. Which tells the machine when to go into a harvest. there is a harvest switch did you try to force it into a harvest and if you did, did it harvest. depending on ambient temperature from start of freeze cycle to harvest it should be making ice every 15 to 18 minuets and then go into a harvest. so start the ice machine and time it , run it for 18 minuets and force into a harvest. after ice drops check the ice bridge thickness. Bridge thickness should be about 3/16'' the ice dimple must not be DEEPER than 1/16". If this is good then we need to look at what is not working to harvest ice. The cube size control is a reverse - acting thermostat that controls the start of the timed freeze cycle. It must be set properly to prove the correct size cube bridge. When it is closed, an indicator light on the control board will be on. If you force it into a harvest and it harvest the ice with no problems and the ice is at the right thickness then replace the cube size control, but if dose not harvest the ice and you see the ice is at a good thickness and not to thick because if it is to thick it will freeze to every thing and will not drop. SYMPTOM. Unit freezes, but will not try to harvest. POSSIBLE CAUSE: Cube size control will not close; to check: Unplug water pump, switch unit OFF and then ON, in about 2 minutes the timed freeze light on the control board should be ON. PROBABLE FIX: If timed freeze light does not go ON, replace cube size control. SYMPTOM #2: Timed freeze light glows, but after 4 minutes unit dose not power hot gas nor purge valves Then replace control board.

Dec 15, 2013 | Scotsman Ice Maker CM3 30inW Cubed Ice...

1 Answer

Scotsman ice maker cme 506 makes ice and turns off and blinks refrigeration


First check to make sure condenser fan is running during freeze cycle. Now check to make sure condenser coil is clean. Her is all the specks on the machine.
1. Ice production ( 500 at 70/50
2. BTUs per hour ( 7000)
3. Maximum times in Minutes. ( 50 freeze, 14 harvest.
4. Refrigerant charge ( R-404A ) ( A-D series: AC 32oz, WC 20 oz. E series AC 23 oz, WC 14 oz, F series AC 23 oz, WC 13 oz
5. Suction pressure ( PSIG ) 35-37 - end of freeze, 120-125-Peak in harvest.
6. Discharge pressure ( PSIG ) 240-260- 5 min in freeze.
165-175- minimum in harvest.
7. Metering device.( TXV plus distributor, E series and higher have two TXVs. superheat 3 to 15 deg F.
8. Average comp.amps. 10-11 during freeze, 11-12 during harvest.
9. Batch Weight. 6.5-7 lb
10. cycle time, 23 minutes @ 90/70. 19 minutes @ 70/50

Feb 24, 2013 | Scotsman Ice Maker CM3 30inW Cubed Ice...

2 Answers

KM450MAB my machine makes a batch of ice then goes into harvest cycle and dose not come out of it, it gets realy hot. What can be the problem?


Probably the suction line thermister, this sensor should signal a timer in the main control board to initiate harvest. If the thermister is OK than there may be a problem with the control board

Nov 20, 2010 | Hoshizaki Freezer Commercial Ice Machines...

1 Answer

I have a brand new (2 days) Frigidaire Gallery series, 23CU side by side that is not making enough ice. We are getting water from the door, the ice maker will only drop about 3 times in 24 hours. the...


Good day,
Light usage in a cool kitchen will reduce ice production substantially.
When the ice maker harvests, it turns on a calrod unit located on it's bottom, that frees the cubes, and as well the heat from the calrod heats up an internal thermostat in the ice maker to a temperature in excess of 70 degrees.
Then it stays at rest, until the cycle thermostat reaches 12 to 14 degress and then performs another harvest cycle.
If the machine runs little, and the fan in the freezer is not circulating cold air, the harvest times will be extended.
Turning the freezer colder will always help.
There is a possibility, the thermostat in the ice maker is out of calibration, and the ice maker needs replaced. But try the settings first, and give it a week or two, before calling for service.
You have a lot iof time under warranty to resolve this issue.

Thank you for using FixYa.

Jan 08, 2010 | Frigidaire Gallery Series GLHS269ZDB 36"...

1 Answer

Slow icecube maker


the harvest mode is started when the ice cube reaches around 14 degrees so lower the temp in the freezer or decrease the size of the cubes also make sure the fan vents in the freezer is unblocked. check the temp in the freezer should be around 0 degrees.

Dec 12, 2008 | Frigidaire Freezer Refrigeration White...

5 Answers

Scotsman CM250AE Ice Machine tech help


Check the bridge size adjustment at the top of the metal grid that the ice forms on. This determines the size of the cubes. Whenever you make a repair on the water system, especially on an older unit. make sure the unit is clean. A little bit of calcium deposits (or that other nasty looking stuff) getting into the passage ways will make it run erratically, and can drive you nuts.

Nov 06, 2007 | Scotsman CSW45 15" Ice Maker with 26 lb....

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