Hoshizaki EE Error Code

What does Hoshizaki EE mean?

On Hoshizaki KM-series crescent cubers, EE is a composite error display that appears when the controller detects any fault other than the primary E1 or E2 backup-timer conditions. The two-letter EE tells you the machine has shut down and logged a specific sub-code (E3 through Ed) that you must retrieve from the controller's error log before troubleshooting, since the underlying cause varies widely.

Symptoms

• Display shows a steady EE and the ice machine has stopped producing ice.
• Control board reset button is lit and freeze/harvest cycles no longer advance.
• Machine may have tripped during harvest, during a long freeze cycle, or at power-up.
• Bin is not filling even though water and power are present.

Common causes

• Water-tank actuator motor failed to reach its fully open or fully closed position within three minutes (sub-codes E3/E4).
• Evaporator thermistor open, shorted, or reading out of range (sub-code EC).
• Condenser thermistor open or shorted for more than two seconds (sub-code E9).
• Evaporator temperature climbed to 140 degrees F or higher during harvest (sub-code E5).
• Control board model-data IC or EEPROM fault (sub-code EA).
• Water regulating valve or low-temperature trip on remote condenser models (sub-code Ed).

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Diagnostic steps

1. Retrieve the stored sub-code

   With the unit powered, press and hold the SERVICE 1 button for three seconds to display the specific sub-code (E3, E4, E5, E9, EA, EC, or Ed) that triggered the EE lockout.

2. Inspect the water-tank actuator motor

   If the sub-code is E3 or E4, manually rotate the actuator and confirm the internal position sensor reports open and closed states. Replace the actuator if it binds or the sensor never signals the endpoint.

3. Ohm out the thermistors

   For EC or E9, unplug the evaporator and condenser thermistors from the controller and measure resistance. A reading of open or near-zero confirms a failed thermistor that must be replaced.

4. Verify harvest performance

   For an E5 sub-code, check the hot gas valve for correct opening, inspect the water-supply line for hot-water crossover, and confirm the evaporator thermistor mounts tightly to the suction line.

5. Replace the control board if required

   An EA sub-code indicates the model-data IC is unreadable and the controller must be swapped. Power down first and transfer the model-specific jumpers to the replacement board.

6. Press RESET and monitor one full cycle

   After the repair, press the RESET button on the controller, then observe a complete freeze and harvest cycle to confirm the EE code does not return.

When to call a professional

Call a licensed refrigeration technician if the sub-code points to refrigerant-side issues such as repeated E5 high-evaporator faults after thermistor replacement, or if the control board replacement does not clear EA. Sealed-system diagnosis, brazing, and EPA Section 608 recovery are required when high head pressure, TXV problems, or leaks are suspected. A professional is also warranted if the machine is under Hoshizaki's factory warranty, since field repairs by unauthorized personnel can void coverage.