Safety first: Disconnect power before accessing the control panels.

E12 indicates the main control cannot communicate properly with another board (often the display/user interface).

Access the control console: Remove the top panel and then the screws securing the front control fascia. Carefully pull the console forward.
Check ribbon cables and harnesses: Ensure the flat ribbon cable or multi-pin harness between the user interface and main control is fully seated and not damaged. Reseat both ends.
Inspect for moisture: Look for signs of condensation or detergent residue on the control boards. Dry gently and clean if necessary.
Visual inspection of PCBs: Check both the main control and user interface boards for burnt components or corrosion. Replace any obviously damaged board.
Reset and test: Reassemble, restore power, and try a test cycle. If E12 persists, one of the boards is likely defective. Replacing the user interface is often tried first, followed by the main control if needed.

Dryer shows E12 and may stop or refuse to start; sometimes linked to communication between boards on advanced models.

Possible Causes