Unit will not start; control board beeps once repeatedly and machine remains off

Safety First: Disconnect power at the breaker before opening any panels. Use a multimeter only if you are trained and comfortable working around electricity.

• Verify supply voltage: Check the data plate on the side or rear of the Hoshizaki ice maker for the required voltage (e.g., 115V or 208-230V). With power ON and panels closed, measure voltage at the wall receptacle. It must match the nameplate rating within ±10%.
• Inspect power cord and terminal block: Disconnect power. Remove the front lower panel. Locate the power terminal block. Check for loose screws, discoloration, or melted insulation. Tighten any loose connections and replace any burned wiring or terminals.
• Check internal fuses: Many Hoshizaki boards have inline or board-mounted fuses. With power off, visually inspect and test continuity with a meter. Replace only with the same type and rating.
• Inspect transformer (if equipped): On some models, a step-down transformer supplies low voltage to the board. Check for burnt smell, discoloration, or open windings (no continuity). Replace if defective.
• Reset power: After corrections, restore power and see if the beeping stops and the unit attempts to start. If the single-beep pattern persists, the control board itself may be faulty.

When to call a technician: If supply voltage is correct and wiring is sound but the unit still gives a single repeating beep, the control board or transformer likely needs replacement and should be diagnosed by a qualified Hoshizaki technician.