E20 appears and the cooker refuses to start any pressure program, though non-pressure modes may work.

Safety first: Ensure the cooker is cool and depressurized. Unplug before internal inspection.

• Check float valve: Inspect the float valve on the lid. It should move freely up and down. Clean any food residue around it and ensure its silicone cap is intact.
• Test interlock behavior: Start a pressure program with water. Observe whether the float rises as pressure builds. If it does not, the valve or gasket may be leaking.
• Inspect sensor: Some models use a microswitch or magnetic reed sensor to detect float position. Access the lid interior or hinge area and check the sensor alignment and wiring.
• Replace faulty parts: If the float valve is damaged or the sensor does not change state when the float is manually raised, replace the float valve assembly or float position sensor.