E8 error during pressure cooking; unit may overheat or fail to regulate temperature correctly.

Safety first: Unplug the cooker and ensure it is depressurized and cool before working near the lid.

• Remove inner lid: If your Tristar model has a removable inner lid plate, take it out and clean both sides thoroughly. Check for a small sensor embedded in the lid area.
• Inspect hinge area: Some models route lid sensor wires through the hinge. Look for pinched or broken insulation where the lid opens and closes.
• Clean connectors: If the lid has a plug-in connector to the body, unplug it (with power off), inspect for corrosion, and clean gently with a dry cloth before reconnecting.
• Test operation: Reassemble and run a non-pressure program (like sauté) to see if E8 appears. If it only appears in pressure modes, the lid sensor is likely at fault.

Persistent E8 errors usually require replacement of the lid temperature sensor or associated wiring harness. This is a moderate to advanced repair and may be best handled by a technician.