Washer stops mid-cycle, may not heat water; sometimes shows F03 shortly after starting a wash.

Safety: Unplug the washer and turn off water supply. Heating components can retain heat; allow time to cool.

F03 indicates a problem with water temperature sensing or control.

• Locate the NTC sensor: Remove the rear panel. The NTC sensor is usually mounted in the heater sheath at the bottom of the tub with 2 small wires.
• Check connections: Ensure the NTC plug is firmly connected and free of corrosion or moisture. Dry and clean if necessary.
• Test NTC resistance: Disconnect the NTC and measure resistance with a multimeter. At room temperature (~20°C), many Indesit NTCs read around 20 kΩ (check service data if available). A reading of 0 Ω (short) or OL (open) indicates a faulty sensor that should be replaced.
• Inspect heater element: While at the heater, check the main heater terminals for signs of burning or limescale buildup. Measure resistance (typically 20–30 Ω). An open circuit means the heater is faulty.
• Check wiring to PCB: Follow the NTC and heater wires to the control board. Repair any damaged connectors or insulation.

If F03 persists after replacing a faulty NTC or heater and verifying wiring, the main control board may have a defective temperature circuit and will likely need replacement by a technician.