E9 is displayed and the cooker cannot detect proper lid lock or pressure state.

Safety first: Unplug the unit. Ensure there is no residual pressure before working on the lid lock.

Checks:

• Listen for lock action: When starting a pressure program (before E9 appears), listen for a click from the lid lock solenoid. No click may indicate a failed solenoid or no power.
• Inspect lock mechanism: Open the lid and inspect the lock tongue and mating slot. Clean any food debris and ensure the parts move freely.
• Access lid lock: Remove the top cover to expose the lid lock solenoid and sensor. Check that the lock rod moves when manually actuated and that the sensor (often a microswitch or Hall sensor) is properly aligned.
• Check wiring: Verify that the lid lock harness is firmly connected to the main control board and that no wires are pinched or broken at the hinge.

Resolution: Replace the lid lock assembly if the solenoid coil is open (no continuity) or if the mechanical parts are cracked. If the lock operates but E9 persists, the lid lock sensor or control board may be faulty and should be tested or replaced by a technician.