Washer-dryer shows E12 during drying; clothes remain damp and cycle ends prematurely

Safety first: Unplug the appliance before accessing internal wiring. Cleaning the sensor bars can be done with the machine off but still plugged in.

Step-by-step checks:

• 1. Clean moisture sensor bars: Inside the drum, locate the two metal sensor strips (usually near the door opening). Clean them thoroughly with a soft cloth and a bit of white vinegar or mild detergent to remove fabric softener residue.
• 2. Avoid dryer sheets: Excessive use of dryer sheets can coat the sensors. Reduce or stop using them and test again.
• 3. Inspect wiring: Unplug the machine, remove the front or top panel, and trace the wires from the sensor bars to the control board. Ensure connectors are tight and wires are not broken.
• 4. Test sensor circuit: With a multimeter, check continuity through the sensor circuit when bridging the bars with a damp cloth. Lack of response indicates a wiring or sensor module fault.
• 5. Control board: If the sensor and wiring are good but E12 persists, the main PCB may be faulty and require replacement.