Dryer stops shortly after start or will not start; E02 displayed on Neff condenser or heat pump dryer.

Safety first: Disconnect mains power before opening any panels. Surfaces around the heater can be very hot.

Basic airflow cleaning:

• Clean the lint filter: Remove the door filter and any secondary filter. Wash with warm water and mild detergent, dry completely, and reinstall.
• Clean the condenser/heat exchanger: On condenser and heat pump models, open the lower front flap, remove the condenser/heat exchanger module and rinse it thoroughly under running water from the rear side until water runs clear. Allow to drain and dry before refitting.
• Check air channels: With the condenser removed, use a flashlight to inspect the air channels for lint build-up. Carefully vacuum loose lint without damaging foam seals.

Sensor and thermostat checks:

• Remove the rear panel (if accessible on your model). Locate the heater housing and the NTC temperature sensor (usually clipped into the duct) and any thermal cut-outs.
• With a multimeter, test the NTC sensor resistance at room temperature; it should be within the range specified in the service documentation (commonly 5–20 kΩ at 20°C). A reading of open circuit or 0 Ω indicates a faulty sensor.
• Check the thermal cut-out(s) for continuity. A tripped or open cut-out will also cause overheating errors.

After cleaning and checks: Reassemble, restore power, and run a timed warm program with no load to see if E02 reappears. If the error persists and airflow is clearly unobstructed, replace the NTC temperature sensor and inspect the heater assembly.