U12 or a similar code appears during pressure cooking; the cooker stops and may release steam.

Safety: Never attempt to open the lid while under pressure. Always allow full depressurization first.

• 1. User Check: Ensure the lid was not manually opened or forced during cooking. Always wait for the float valve to drop before opening.
• 2. Gasket and Valve Inspection: Check the lid gasket, float valve, and steam release valve for damage or improper seating that could cause sudden pressure loss.
• 3. Lid Lock Sensor Test: Inspect and test the lid lock microswitch as described in the E5 procedure. Replace it if it intermittently reports the lid as open.
• 4. Pressure Sensor Check: Inspect the pressure sensor and its tube for loose connections that could cause sudden reading changes.

If U12 repeats without user error, discontinue use until the lid lock and pressure system are inspected by a technician.