Washer-dryer combo displays E20 and may not advance cycles; often associated with internal communication or sensor bus errors.

Safety first: Unplug the appliance before inspecting internal wiring or boards.

• Power cycle: Unplug for 5–10 minutes, then plug back in and attempt to run a short cycle.
• Inspect harnesses: Remove the top and rear panels. Follow the main wiring harness and check all connectors to sensors (NTC, pressure sensor, door lock, motor) for secure fit.
• Look for damage: Inspect the harness for pinched, cut, or burned wires, especially where it passes through metal openings.
• When to replace parts: Repair or replace damaged wiring harness sections. If all wiring is intact and E20 persists, the main control board or a specific sensor module may need replacement by a technician.