Food is undercooked even though the full pressure cooking cycle completes without errors.

Safety first: Allow pressure to release before opening the lid.

• Verify program and time: Confirm you are using the correct Tristar program and recommended time for the food type.
• Check for minor leaks: During cooking, observe the lid area from a safe distance. Continuous light steam from the rim or float valve indicates a small leak.
• Replace gasket and float seal: If they are more than a year old or show wear, replace them to ensure full pressure.
• Test with water: Run a pressure cycle with only water and observe how long it takes to reach pressure and complete. If it seems abnormally long or short, the sensor may be misreading.

Persistent undercooking despite new seals and correct settings may indicate a pressure sensor or control PCB calibration issue, requiring professional service.