E8 error appears and the cooker fails to reach or maintain pressure.

Safety first: Unplug the cooker and allow it to cool before handling the lid components.

• Check steam release position: Ensure the steam release knob or lever is set to Seal (or equivalent) when attempting pressure cooking.
• Inspect the silicone gasket: Remove the lid gasket (sealing ring), wash it with warm soapy water, rinse, and dry. Check for cracks, tears, or deformation. Reinstall it firmly in the lid groove.
• Clean lid rim and pot rim: Wipe both surfaces to remove food residue that could prevent a proper seal.
• Examine float valve: Make sure the float valve pin moves freely and that its small silicone cap is present and not split.
• Water-only test: Add at least the minimum water and run a pressure program. Watch for continuous steam escaping from the lid; if so, the gasket or valve assembly likely needs replacement.

If E8 persists with a new gasket and clean valves, there may be an internal leak path or sensor issue that requires professional service.