Air fryer heats but never reaches set temperature; cooking takes much longer than normal.

Safety first: Disconnect power before internal checks.

Steps to improve temperature accuracy:

• Check loading: Avoid overfilling the basket; too much food can prevent reaching set temperature.
• Inspect sensor placement: Ensure the NTC sensor is firmly attached to the metal housing near the heater and not bent away.
• Test sensor: Compare the sensor resistance at room temperature and at a known warm temperature (e.g., 60°C using a controlled environment) to Princess specifications.
• Check heater output: If the heater glows only dimly or cycles off too early, the element may be partially failing or the control PCB may be misreading temperature.
• Replace parts: Replace a suspect NTC sensor first. If performance does not improve, consider replacing the heating element assembly or main control PCB.