Drying cycle fails with E17; temperature control problem in dryer circuit.

Safety first: Unplug the appliance and allow the dryer section to cool fully before working near the heater or ducts.

Step-by-step checks:

• Clean airflow path: Remove lint from the door filter, condenser (if removable), and all accessible ducts. Restricted airflow can cause overheat errors.
• Locate dryer NTC: Usually mounted on the hot air duct or near the dryer heater. Disconnect and measure resistance at room temperature, comparing with specifications.
• Check thermostats: Test any thermostats or thermal cut-outs on the dryer duct for continuity. Replace any that are open and not resettable.
• Inspect wiring: Ensure all connectors to the NTC and thermostats are secure and undamaged.
• Reassemble and test: Run a drying cycle and monitor for normal heating and absence of E17.

When to call a technician: Persistent E17 with good components suggests a PCB fault that should be handled professionally.