What does the Indesit F03 error code mean?

F03 indicates a fault in the dishwasher’s heating system. Either the heating element has failed and cannot raise the water temperature, or the NTC thermistor (temperature sensor) is providing incorrect readings to the control board.

🔍 Symptoms

1. Dishes are greasy and not properly cleaned
2. No steam when opening the door during or after a hot cycle
3. Poor drying performance — everything is wet at the end
4. Glassware has a cloudy or milky film
5. Cycle completes normally in terms of time but results are poor

How to fix the Indesit F03 error code

1. Confirm by opening the door mid-cycle — no warmth or steam confirms the heater is not operating.
2. Access the NTC thermistor — on most Indesit dishwashers it is located in or near the sump. Test it with a multimeter.
3. Test the heating element for resistance — 20–40 ohms is normal. No continuity means it has failed.
4. Replace the faulty component. The NTC is worth testing first as it is the cheaper fix.
5. If both test fine, the relay on the main PCB that controls the heater may have failed.

Frequently Asked Questions (FAQ)

Q: Is F03 on Indesit dishwashers related to F03 on Hotpoint dishwashers?

A: Yes. Indesit and Hotpoint are part of the same Whirlpool group and use shared platforms. The F03 code means the same heating fault on both brands, and in many cases the same spare parts are compatible.

Q: Can descaling fix an F03 error?

A: If the element is coated in heavy limescale, its efficiency drops dramatically. While descaling may improve performance, a machine that displays F03 typically has a component that has actually failed, not just scaled up.

Q: My Indesit dishwasher shows F03 in the middle of a cycle — not at the start. What does that mean?

A: This is typical of a heater that partially works before failing. The element heats initially but then burns out mid-cycle, or the NTC gives a wrong reading once it warms up.

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