Timer does not count down during pressure cooking; unit appears to stay in preheat indefinitely, but some pressure is present.

Safety first: Allow the cooker to cool and depressurize before inspection.

• Check for leaks: During a test run with water, observe for continuous steam leaks around the lid or valve.
• Clean and replace seals: Clean the sealing ring, steam release valve, and float valve. Replace worn components.
• Adjust recipes: Avoid overfilling and use recommended amounts of oil or anti-foam agents for starchy foods.
• Element performance: If the unit struggles to maintain a vigorous boil, the heating element may be weakening and require replacement.
• Sensor/board: If mechanical sealing is perfect but the timer still does not start, the pressure sensor or control logic may be faulty.

Warning: Do not extend cook times excessively to compensate for low pressure; fix the underlying issue.