Overheat warning, unit shuts down after a few minutes of use and will not restart until cooled

Safety: Unplug the cleaner and allow it to cool for at least 30 minutes before inspection.

• Clean filters and vents: Remove and thoroughly clean the pre-motor and post-motor filters according to the Siemens manual. Check all air intake and exhaust grilles for lint, hair, and dust buildup and clean them.
• Check for suction blockages: Detach the hose, wand, and floor head. Inspect for clogs in the hose, nozzle, and recovery path. Use a flexible brush or compressed air to clear obstructions.
• Inspect the cooling fan: On some Siemens carpet cleaners, the suction motor has an integrated cooling fan. With the housing open (unit unplugged), spin the fan by hand; it should rotate freely without scraping. If seized or broken, replace the motor assembly.
• Verify thermal sensor connection: Locate the NTC or thermal cut-out attached to the motor housing. Ensure its wiring harness is firmly connected and not damaged. A loose or open sensor can falsely signal overheat.

If the unit continues to shut down quickly even after cleaning and verifying airflow, the motor or temperature sensor may need replacement by a service technician.