F03
Ariston
NTC Temperature Sensor Fault
Cycle stops early; machine may not heat water; display shows F03.
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Safety Warning
This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.
If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.
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Possible Causes
Open or shorted NTC sensor, loose NTC connector, damaged wiring between NTC and control board, defective main control board temperature circuit
How to Fix / Troubleshooting
Safety: Disconnect power and allow the machine to cool before working near the heater.
How to check:
- Locate the NTC: On Ariston washer-dryer combos, the NTC (temperature sensor) is usually mounted in the heater housing on the side or bottom of the tub.
- Inspect connector: Remove the rear or front lower panel (depending on model) and locate the NTC. Ensure the connector is tight and free of corrosion. Reseat it.
- Measure resistance: Disconnect the NTC and measure its resistance with a multimeter. At room temperature (~20–25°C), it should typically read between 20–30 kΩ (check Ariston specs). If it reads near 0 Ω (short) or OL (open), replace the NTC.
- Check wiring: Trace the NTC wires to the control board. Look for damage or loose plugs at the board.
- Control board: If the NTC and wiring are good but F03 persists, the temperature sensing circuit on the PCB may be faulty and the board will need replacement.
Tip: Always refit the NTC firmly into its housing to ensure proper contact with the tub water.
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Repair Difficulty
Medium
3/5
Required Part
NTC Temperature Sensor
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