Safety first: Turn off power and shut off water supply before working around the water system.

Steps:

Locate water sensor: On Manitowoc ice makers, the water temperature sensor is typically mounted in the water trough or sump area. Refer to the model’s parts diagram if needed.
Check sensor position: Ensure the sensor is properly installed in its well or bracket and will be submerged during operation. Reposition if it has come loose.
Inspect for scale: Heavy mineral buildup can insulate the sensor. Clean the sensor and surrounding area with Manitowoc‑approved ice machine cleaner, then rinse thoroughly.
Check wiring: Follow the harness to the control board and reseat the connector. Look for damaged insulation or corrosion.
Replace if faulty: If E05 persists and resistance readings are out of spec, replace the water temperature sensor.

Tip: After sensor replacement, run a full clean and sanitize cycle to ensure proper water system operation.

E05 displayed, unit may not start or may stop mid‑cycle.

Possible Causes