Carpet cleaner’s heated cleaning mode seems weak; water is only lukewarm even after extended use, but no error code is shown.

Safety first: Unplug and allow the unit to cool before working on the heater or water path.

• Descale water path: Run a mixture of warm water and white vinegar through the clean water tank and heater system, then flush with clean water to remove limescale.
• Clean inlet filters: Check and clean any mesh filters before the heater to ensure adequate flow.
• Check mains supply: Avoid using long, thin extension cords that can cause voltage drop and reduce heater output.
• Service heater if needed: If performance remains poor, the heater element may be partially failing and should be tested and replaced by a technician.

Using softened or filtered water can reduce future scale buildup in the heater.