E9 is displayed and the cooker beeps, refusing to start a program.

Safety first: Ensure the cooker is unplugged and not under pressure before manipulating the lid lock.

• Check for pressure: Confirm the float valve is down. If it is up, the cooker may still be pressurized; do not force the lid.
• Clean around the lock: Using a soft brush or cloth, clean around the lid lock slot and hinge area to remove dried food or grease.
• Gently exercise the lock: With the unit unplugged and cool, gently open and close the lid several times to free a sticky lock pin. Do not use tools to pry the lock.
• Power cycle: Plug the unit back in and see if the lock engages/disengages normally when starting and canceling a program.

If E9 continues and the lid will not lock or unlock reliably, the lid lock assembly or its sensor likely needs replacement, which should be done by a qualified technician.