E8 appears and the unit shuts down when using the heated cleaning mode (if equipped).

Safety first: Unplug the cleaner and allow it to cool completely before inspection. Hot water and components can cause burns.

• Use cold mode: If available, switch to a non-heated cleaning mode. If the unit works without E8, the fault is likely in the heater circuit.
• Descale the system: Empty the clean tank and refill with a manufacturer-approved descaling solution or a mild citric acid solution. Run a short cycle (if the manual allows) to dissolve limescale in the heater and hoses, then flush thoroughly with clean water.
• Check heater connections (advanced): Remove the lower cover to access the in-line heater (usually a metal or plastic block in the solution line). Inspect wiring and connectors for burning or looseness.
• If E8 persists: The heater element or its temperature sensor (NTC) may be open-circuit, or the heater relay on the PCB may be defective. These parts should be tested and replaced by a qualified technician.