Display shows “Hi” or an over-temperature warning even when water is not boiling, and heating stops.

Safety first: Unplug and let the unit cool.

• Power reset: Unplug for 5 minutes, then plug back in and test with fresh, cool water.
• Descale and clean: Heavy scale or residue on the bottom can cause hot spots near the sensor. Descale thoroughly and wipe the interior with a non-abrasive cloth.
• Check for physical damage: Inspect the kettle interior for dents at the bottom where the sensor contacts the metal; deformation can affect readings.
• If Hi appears at room temperature: The sensor or control board is likely defective and must be replaced. This requires disassembly and should be done by a qualified technician.