Heated Kärcher carpet cleaner does not heat water, but otherwise operates normally.

Safety first: Unplug the unit and allow it to cool completely before working on the heater.

• Check heater switch: Ensure the heater ON/OFF switch is engaged and any indicator lights are functioning.
• Inspect wiring: Access the heater block and verify all spade connectors are tight and free of corrosion.
• Test element: Measure resistance across the heating element. An open circuit indicates failure; replace the heater assembly.
• Reset or replace thermostat: If a manual-reset thermostat is fitted, press the reset button. If it trips repeatedly, investigate for scale or flow issues and replace if necessary.