Display shows E11; unit will not start due to safety interlock.

Safety: Unplug the Husqvarna carpet cleaner before adjusting tanks or switches.

• Reseat tanks and nozzle: Remove and reinstall the clean solution tank, recovery tank, and front nozzle. Ensure each clicks firmly into place and that seals are properly seated.
• Inspect interlock tabs: Look for small plastic tabs or magnets on the tanks/nozzle that actuate the interlock switch. If broken or missing, the tank or nozzle assembly may need replacement.
• Test interlock switch: Access the switch near the tank or nozzle mount. Use a multimeter to verify continuity when the tank/nozzle is installed. Replace the Husqvarna interlock switch if it does not change state.
• Check wiring: Follow the interlock harness to the main board and ensure connectors are secure.