E9 error appears and the unit stops; often associated with very loud motor noise or burning smell.

Safety first: Unplug the Philips carpet cleaner immediately if you smell burning or see smoke. Do not attempt to restart.

• Visual inspection: Remove the housing to access the motor and wiring. Look for burnt insulation, melted connectors, or signs of water ingress around the motor housing.
• Check for moisture: If water has entered the motor compartment, the motor is unsafe to reuse. Identify and repair the source of the leak (hoses, seals) and replace the motor assembly.
• Test motor windings: With a multimeter, measure resistance across the motor terminals. A very low resistance (near 0 Ω) or visible arcing marks indicate a shorted motor.
• Inspect wiring harness: Follow the motor wires back to the PCB. Repair or replace any sections with damaged insulation or burn marks.
• PCB inspection: Check the motor driver components (triac, relay, or MOSFET) on the main PCB for cracking or burning. If damaged, replace the main PCB.

Due to fire and shock risk, a motor or PCB that has shorted should be replaced rather than repaired at component level by non-professionals.