Dryer shows E20; may be associated with internal communication between boards on advanced models.

Safety Warning

This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.

If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.

Possible Causes

Loose harness between main board and sub-board, Faulty sub-control board (e.g., motor control), Electrical noise or surge damage, Defective main control board

How to Fix / Troubleshooting

Safety first: Disconnect power.

Steps:

Inspect inter-board harnesses: Open the cabinet and locate cables between the main PCB and any secondary boards (motor control, heat pump module). Reseat all connectors.
Check for damage: Look for pinched or abraded wires, especially where harnesses pass through metal openings.
Power reset: After reseating, restore power and test. If E20 returns, one of the boards may be defective.

Board-level communication faults generally require professional diagnosis and replacement.

Repair Difficulty

Professional Required 5/5

Required Part

Motor Control Board

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