E8 is displayed and the unit fails to build or maintain pressure during a pressure cook program.

Safety first: Unplug the cooker and ensure it is fully depressurized before working near the lid or pressure components.

• 1. Clean pressure path: Remove the steam release valve, anti-block shield, and float valve components. Clean all parts thoroughly to ensure clear airflow.
• 2. Inspect pressure sensor tube: On models with a separate pressure sensor, locate the small silicone tube running from the lid or inner chamber to a sensor on the PCB or chassis. Check for kinks, cracks, or disconnections. Replace the tube if hardened or damaged.
• 3. Clear sensor port: If the sensor is mounted directly to the chamber, gently clean the port with a dry cotton swab. Do not insert metal objects.
• 4. Test with water: Reassemble and run a short pressure cycle with 2 cups of water. If E8 reappears quickly, the sensor may be out of range or defective.
• 5. Replace pressure sensor: If accessible, replace the pressure sensor module with a Chefman-compatible part. Ensure the seal or O-ring around the sensor port is intact to prevent leaks.

Pressure sensor calibration is typically factory-set; if a new sensor does not resolve E8, the main control board may need replacement.