E4 error appears and the ice maker stops mid‑cycle, often during harvest

Safety: Disconnect power and turn off the water supply before working on the water system.

• Access water reservoir: Remove the ice bin and internal covers to expose the water tank or sump. Locate the float switch or electronic level sensor assembly.
• Check for obstructions: Inspect the float for debris, mineral scale, or ice fragments that may prevent free movement. Clean the reservoir thoroughly with warm water and a mild descaler approved for ice machines.
• Test float switch: If it is a mechanical float switch, disconnect its wires and test continuity with a multimeter while moving the float up and down. The switch should open and close reliably.
• Inspect wiring: Follow the harness from the level sensor to the main control PCB. Look for pinched wires, loose connectors, or corrosion at terminals. Reseat connectors firmly.
• Replace sensor assembly: If the float is cracked, waterlogged, or the switch does not change state, replace the Hoover water level sensor/float assembly with the correct part.
• Flush system: After reassembly, run a cleaning cycle if available to ensure proper water flow and sensor operation.