E4 error appears and the cooker refuses to enter pressure mode or stops shortly after building pressure.

Safety first: Unplug the unit and ensure it is cool and depressurized before working on the lid.

• Check lid gasket: Remove the inner lid (if present) and carefully pull out the large silicone sealing ring. Inspect for cracks, deformation, or hardening. Clean it with warm soapy water and dry thoroughly.
• Inspect gasket groove: Clean the groove in the lid where the gasket sits. Food residue here can prevent a proper seal.
• Verify float valve seal: Check the small silicone cap on the float valve pin. Replace it if it is cracked, swollen, or missing.
• Steam release position: Ensure the steam release knob or lever is set to the sealing position before starting a pressure program.
• Reinstall gasket correctly: Fit the gasket evenly around the lid, ensuring it is not twisted. Press it fully into the groove.
• Test with water: Add 2–3 cups of water to the pot and run a short pressure program. Observe if steam leaks around the lid. If so, replace the gasket with a Hisense-compatible lid silicone gasket.