Dryer stops with E05, often early in the cycle; some models may beep and refuse to start a new cycle until cooled.

Safety first: Unplug the dryer. Sensors are usually near hot areas; ensure the machine is cool.

Step-by-step checks:

• Locate the NTC sensor: On many Proline dryers, an NTC (temperature sensor) is mounted on the heater housing or in the exhaust duct. It is a small probe or disc with two wires.
• Visual inspection: Check for broken sensor bodies, loose connectors, or wires pulled tight or chafed against metal edges.
• Test sensor resistance: Disconnect the sensor plug. Measure resistance at room temperature with a multimeter. Typical NTC values are between 5–20 kΩ at 20–25°C (check service data if available). A reading of 0 Ω (short) or infinite (open) indicates a faulty sensor.
• Check harness continuity: If the sensor tests good, test continuity from the sensor connector back to the main control PCB connector to rule out broken wires.
• Replace and test: Fit a new NTC sensor if faulty, ensuring good thermal contact with the mounting surface. Reassemble and run a test cycle.

When to call a technician: If wiring and sensor are good, the control board's sensor input circuit may be defective.