E12 displayed; freezer may not enter fast-freeze mode or may exit it prematurely.

Safety first: Unplug the freezer before accessing control panels.

Check user controls:

• Press the super-freeze button and observe whether the indicator LED or icon responds.
• If the button feels stuck or unresponsive, the user interface may be faulty.

Inspect user interface and wiring:

• Remove the control fascia to access the super-freeze switch or touch PCB.
• Check for cracked solder joints or moisture damage around the button.
• Verify the harness from the interface to the main PCB is intact and firmly connected.

Corrective actions:

• Clean or replace button module: For mechanical switches, clean contacts with electrical contact cleaner or replace the switch module. For touch panels, replace the entire user interface PCB if defective.
• Replace main PCB: If the interface is working but the freezer will not enter or maintain super-freeze and E12 persists, the main board's control circuit may be faulty and require replacement.

Test: After reassembly, restore power and activate super-freeze. Confirm that the indicator lights and that the compressor runs continuously as designed, without E12 reappearing.