Troubleshooting Safety Limit #2 on Koolaire Ice Machine July 13 2015, 4 Comments
Koolaire ice machines, that shut down prematurely may be turning off due to a safety limit. This article covers the Safety Limit #2 indicator and items to check to help diagnose your ice maker. This feature helps protect your investment, by shutting down the equipment, to prevent damage to parts like the compressor, control board, or evaporator.
What is Safety Limit #2
Safety Limit 2 happens whenever the harvest time exceeds 3.5 minutes for 100 consecutive harvest cycles. It's important to monitor your ice machine and time the harvest cycle, a normal harvest time is around 1.5 5o 2 minutes. Anything longer indicates that it most likely needs to be cleaned or there are other problems, which are outlined below.
Water System
When a Koolaire goes off on a safety limit 2, check the following areas in the water system or circuit. First, make sure the evaporator is clean. Sometimes the only to actually see scale build up on the nickel plated evaporator is for it to be completely dry. Next, make sure you don't have a blocked or dirty dump valve.
After the dump valve, look to see if the vent tube was properly installed for the drain. Next, look for water freezing behind the evaporator or extrusions and gaskets not securely mounted. These things will 'hold' a sheet of ice that has formed on the evaporator from falling properly.
Electrical System
Look to see if the bin switch is defective, by checking the OHM reading. You need consistency, instead of a constant range of OHMs. Open and close the water curtain, while monitoring the bin switch reading. If at anytime it's not consistent, replace before troubleshooting other areas of the Koolaire ice maker.
Next, make sure the Koolaire is not attempting to harvest ice prematurely. If the sheet of ice is not properly formed, it may not fall off the evaporator properly. Inspect the evaporator for ice formation during the freeze cycle and then listen and watch for the control board to initiate a harvest. If it's premature, you may need to adjust the harvest float switch or replace.
If you have questions about troubleshooting your Koolaire ice machine, contact Ice Maker Parts Shop at sales@icemakerpartsshop.com for assistance. Below are refrigeration issues to look for, but we only recommend trained technicians to perform checks on ice maker parts below.
Refrigeration System
Inspect the checklist below for refrigeration parts that may be failing, causing the Koolaire to shut down on a safety limit number 2.
- non-oem components
- improper refrigerant charge
- defective harvest valve
- TXV flooding
- defective fan cycling control
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Brian Kilburn on July 28 2016 at 09:05AM
I work for Stockton University in New Jersey and we have a Koolaire KY1350A-261 ice machine. Serial # 1120020677. The ice machine works when it wants to and then makes a giant sheet a ice when it want to. I have spent too many man hours watching and waiting for this machine to fail. I just cleaned and serviced the machine. My pressures are good from start to finish. Water filters are clean. Fan shuts down at start of harvest. When the ice machine runs correctly my bridge is 1/8 inch. It sometimes makes ice for two days with no problem and then, there it happens again. I suspected power loss to machine but we did power test to disprove this. I know many others have had this problem according to the supply stores but they don’t give me the answer im looking for. Please help if you can. Thank You