How to Fix / Troubleshooting

Safety first: Ensure the cooker is fully depressurized and unplugged before inspection. Never open the lid under pressure.

Clean steam path: Remove and clean the steam release valve and anti-block shield (metal or plastic cap over the steam outlet). Soak in warm soapy water, rinse, and dry thoroughly.
Inspect pressure sensor port: On many Kenwood models, a small silicone tube or channel connects the lid steam area to a pressure sensor. Check for starch buildup or blockage and gently clear it with a soft brush or pipe cleaner.
Check connectors: If accessible, remove the top cover and locate the pressure sensor (small module with two wires or a ribbon cable). Ensure its connector is firmly seated on the control PCB.
Test with water: Add water to the pot, close the lid, and run a short pressure program. If E4 appears immediately, the sensor or board is likely defective.

Persistent E4 after cleaning and connector checks usually requires replacement of the pressure sensor assembly.

E4 error appears when trying to use pressure-cooking programs; unit aborts before reaching pressure.

Possible Causes