Dishwasher stops mid‑cycle, often during heating phase, and may show F03 or a pattern of 3 flashes. Dishes are left cold and wet.

Safety: Disconnect mains power and allow the machine to cool before working near the heater or sump.

Locate the NTC:

• Remove the lower front panel or side panel to access the sump area.
• The NTC (temperature sensor) is usually clipped into the side of the plastic sump or integrated into a small probe housing with two wires.

Check connections:

• Unplug the NTC connector and inspect for corrosion or moisture. Dry thoroughly and clean contacts if needed.
• Ensure the wiring harness is not pinched or damaged along its route to the control board.

Test the sensor:

• Measure resistance across the NTC with a multimeter at room temperature. Typical values are in the 40–60 kΩ range (check Indesit service data for your model).
• If the reading is open circuit, shorted, or far outside spec, replace the NTC sensor.

Reassemble and test:

• Refit the sensor securely into the sump, ensuring the O‑ring or seal is correctly seated.
• Reconnect wiring, refit panels, restore power, and run a hot cycle to confirm normal operation.