What does the Indesit F03 error code mean?
F03 indicates the NTC thermistor (temperature sensor) is faulty or has lost its connection. The machine cannot accurately monitor water temperature, which prevents it from running temperature-controlled wash programmes safely.
How to fix the Indesit F03 error code
- Try running a cold wash — if this succeeds, the fault is confirmed as temperature-sensing related.
- Unplug the machine and access the heating element (front panel removal is needed on most Indesit models).
- The NTC thermistor is the small two-wire probe clipped to the heating element.
- Check the wiring connector is firmly seated — a loose connection often causes intermittent F03 errors.
- Test with a multimeter: approximately 20,000 ohms at room temperature. Replace if out of range or open circuit.
Affiliate disclosure: This page contains affiliate links. We may earn a small commission if you buy through them, at no extra cost to you.