Washer-dryer shows E20; may not start drying or may stop shortly after starting

Safety first: Unplug the appliance before accessing the base or pump area.

Step-by-step checks:

• 1. Access condenser pump: Many washer-dryer combos have a small condenser drain pump in the base. Remove the rear or bottom panel to locate it.
• 2. Check for blockage: Inspect the small hoses to and from the pump for lint or scale. Clean thoroughly.
• 3. Test pump: Spin the pump impeller by hand to ensure it is free. Measure resistance across the pump terminals; an open circuit indicates a failed pump.
• 4. Inspect wiring: Ensure connectors are secure and not corroded.
• 5. Replace pump: If the pump is seized or electrically open, replace the condenser drain pump and retest drying.