Dryer stops heating or cycles erratically, F03 error on display, clothes remain damp even after long cycles.

Safety first: Disconnect mains power before accessing the rear or front panels.

• Clean lint and airflow: Before assuming a sensor fault, clean the lint filter, condenser (if condenser/heat pump model), and exhaust duct. Poor airflow can cause temperature errors.
• Locate NTC sensor: On most Hotpoint-Ariston dryers, the NTC (thermistor) is mounted on or near the heater housing or air duct. Remove the rear panel to access it.
• Visual inspection: Check the sensor body and wiring for signs of overheating, cracks, or broken insulation. Ensure the connector is firmly seated.
• Resistance check: With the dryer unplugged, disconnect the NTC and measure its resistance with a multimeter. Compare to the service manual values (typically around 20–30 kΩ at room temperature). If open (infinite) or near 0 Ω, replace the NTC.
• Harness check: If the NTC tests good, inspect the harness back to the control board for continuity and damage. Repair or replace as needed.

Warning: Do not bypass the NTC sensor; this can cause overheating and fire risk.