Rug Doctor digital carpet cleaner shuts down during use and displays E4; unit may restart after cooling.

Safety: Turn the unit off and unplug it. Allow it to cool for at least 30 minutes before inspection.

• 1. Check airflow path: Inspect the recovery tank lid, gaskets, and intake port for debris or obstructions. Remove any hair, lint, or carpet fibers blocking airflow.
• 2. Clean filters: Many Rug Doctor models have a lint filter or debris screen in the recovery tank or suction path. Remove and rinse thoroughly under warm water. Let it dry before reinstalling.
• 3. Inspect vacuum hose: Detach the vacuum hose and wand and check for clogs. Use a flexible brush or a straightened coat hanger (carefully) to push out blockages.
• 4. Verify cooling vents: Ensure the motor cooling vents on the sides or rear of the machine are not blocked by dust or placed too close to walls or furniture during use.
• 5. Thermal sensor: If E4 appears quickly even with clean filters and good airflow, the motor thermal sensor or thermostat may be faulty. This typically requires replacement of the sensor or the entire motor assembly.

Usage note: Follow Rug Doctor's recommended duty cycle; allow rest periods during heavy use to prevent overheating.