F03
Hotpoint-Ariston
NTC Temperature Sensor Circuit Fault (Wash Heating)
Cycle stops early, machine may not heat or may overheat; 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
Failed NTC temperature sensor on heater housing, Loose or corroded NTC connector, Damaged wiring between NTC and control board, Faulty main control board analog input
How to Fix / Troubleshooting
Safety: Unplug the appliance and allow it to cool before working near the heater.
F03 indicates a problem with the wash water temperature sensor (NTC).
- Access the NTC sensor:
- Remove the rear panel.
- Locate the wash heater assembly on the bottom of the tub.
- The NTC is usually clipped into or near the heater bracket with two wires attached.
- Check connections:
- Ensure the NTC plug is fully seated.
- Look for corrosion, moisture, or burnt contacts.
- Test the NTC (for users with a multimeter):
- Disconnect the NTC connector.
- Measure resistance at room temperature; typical values are 20–30 kΩ at ~20°C (check service manual for exact spec).
- Warm the sensor gently in your hand; resistance should decrease smoothly.
- If open, shorted, or erratic, replace the NTC.
- Inspect wiring harness: Trace the NTC wires to the control board and check for cuts, pinches, or loose pins at the board connector.
- If NTC and wiring are good: The main control board input circuit may be defective and require replacement.
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Repair Difficulty
Medium
3/5
Required Part
NTC Temperature Sensor (Wash Heater)
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