The 1-beep audible alarm is a safety feature that lets you know that your (KM) crescent cube icemaker has triggered the High-Temperature Safety Switch at 127°F.  Some of the reasons for a 1-beep safety alarm are as follows:

Begin troubleshooting by resetting the control board while the icemaker is on. Follow the instructions provided on the control board diagnostic label to reset the alarm and check these areas to locate the problem.

  • CHECK THE HOT GAS VALVE (HGV):
    • Check for a temperature differential across the hot gas valve.
  • CHECK FOR HOT WATER MIGRATION:
    • This typically happens at night – when the only piece of equipment requiring water flow is the ice machine. Hot water migration is a tough problem to find and to prove to the customer.
    • The best way to determine that this is happening is to place a temperature recorder on the inlet water line of the ice machine. The recorder will show when migration occurs.
    • Usually, hot water migration is due to a defective mixing valve in the existing plumbing. A good place to check is the pre-wash area at the dishwasher.
  • CHECK FOR A STICKING RELAY:
    • Use a volt meter to check for voltage on the pink wire, pin # 2 on the K1 connector.
  • CHECK THE HEADMASTER ON REMOTE-COOLED CONDENSER UNITS:
    • The headmaster on a remote-cooled condenser unit may get stuck in high ambient conditions.
    • The best way to check for this is to carefully touch the liquid line connection at the rear of the unit.
    • Check for heat at the inlet pipe to the receiver tank. If these areas are hot, the headmaster is likely stuck in the bypass mode.
  • CHECK THE HEADMASTER ON REMOTE-COOLED CONDENSER UNITS:
    • The headmaster on a remote-cooled condenser unit may get stuck in high ambient conditions.
    • The best way to check for this is to carefully touch the liquid line connection at the rear of the unit.
    • Check for heat at the inlet pipe to the receiver tank. If these areas are hot, the headmaster is likely stuck in the bypass mode.
  • CHECK THE THERMISTOR:
    • If the thermistor reads approximately 500 ohms or less then the control board will lock out on this safety.
    • A shorted thermistor will signal 0 ohms and cause repeated shut down on the high-temperature safety switch.