–127–ICE MACHINE WILL NOT HARVEST DIAGNOSTICSIce relaease issues fall into two main categoriesmechanical or refrigeration. The first step in solving anice release issue is to determine which conditionexists. At the end of the harvest cycle place the toggleswitch in the OFF position, then remove and inspectthe sheet of ice. If the cubes are well defined and show no signs ofmelting a refrigeration problem is indicated. If the cubes are deformed and melted away (sharksteeth) a mechanical problem is indicated.Something on the evaporator is causing the harvestproblem. Always clean the evaporator before diagnosin therefrigeration system. The water curtain must swing freely open andclosed and the bin switch must function properly.Refer to the checklist below, then specifications/diagnostics for individual components.Harvest Cycle Diagnostic List1. Suction, liquid line shut off valves and receiverservice valve are fully open?2. Line set properly sized?3. Suction and liquid line sets are insulated?4. Refrigerant charge is correct? (Overcharge orundercharge affects harvest cycle)5. Headmaster opperating correctly? (Checkoperation in freeze and harvest cycle)6. Condenser fan shutting off during harvest cycle?7. Cool vapor valve energized and open?8. Liquid line kinked between condenser and icemachine head section?’9. TXV flooding during the freeze cycle?
