Display shows E4 and the unit stops; water level in the reservoir is normal but the machine will not start an ice cycle.

Safety first: Disconnect the Severin ice maker from power before removing the water tank or internal panels.

• Check water level: Ensure the reservoir is filled to the correct mark. Some Severin models will show E4 if the tank is too low or too high.
• Inspect the float: Locate the water level float (usually a plastic float in the reservoir or a small chamber). Make sure it moves freely up and down. Clean any scale or debris that may cause sticking.
• Clean the sensor area: If your model uses electronic level probes, clean them with a soft cloth and white vinegar to remove mineral deposits that can interfere with sensing.
• Check wiring: Follow the wires from the float or sensor to the control PCB. Ensure connectors are fully seated and wires are not pinched or broken.
• Test the float switch: With a multimeter, check continuity across the float switch terminals while moving the float between low and high positions. The switch should open and close reliably.
• Replace if necessary: If the float is damaged or the switch does not change state, replace the water level sensor/float assembly. If the sensor is good but E4 persists, the control PCB input circuit may be defective and require replacement.