Drying cycle does not heat; clothes remain wet and cool, E06 appears during or after drying.

Safety first: Unplug the appliance and allow it to cool completely before working near the dryer heater.

Step-by-step checks:

• Clean airflow path: Remove the lower front panel or rear panel (depending on model) to access the condenser and airflow ducts. Clean lint and fluff from the condenser, fan housing, and ducts to restore airflow.
• Check thermal cut-outs: Locate the thermal cut-out devices mounted on or near the dryer heater housing. Test them for continuity with a multimeter. An open circuit indicates a tripped or failed TCO that must be replaced (do not bypass permanently).
• Test dryer heater: Disconnect the heater terminals and measure resistance. Infinite resistance indicates a failed heater element that must be replaced.
• Inspect dryer NTC: The dryer temperature sensor is usually clipped to the duct or heater housing. Test its resistance and compare with Proline specifications. Replace if open, shorted, or out of range.
• Resettable thermostats: Some models have a manual-reset thermostat button on the heater housing. If present, press gently to reset, then test operation. If it trips again, investigate airflow and overheat causes.

When to call a technician: If heater replacement requires extensive disassembly or if you suspect a control board fault, professional service is recommended.