Safety first: Unplug the machine and allow it to cool completely before inspecting any heater components. Risk of electric shock and burns.

Confirm symptom: Check that the machine otherwise sprays and vacuums correctly, but water is not warming and the heater indicator flashes or E9 appears.
Check power mode: Ensure the heated cleaning mode is actually selected (if your model has multiple modes). Refer to the user manual for correct button sequence.
Visual inspection: If accessible without full disassembly, inspect the heater wiring harness for signs of burning, loose connectors, or melted insulation.
Do not bypass safety devices: Never attempt to bypass a thermal fuse or thermostat on the heater block. These are critical safety components.
Professional repair recommended: Inline heater and temperature sensor replacement require opening the main body, disconnecting water lines, and resealing connections to prevent leaks. This should be done by an authorised VAX technician.

Heated cleaning mode not working, heater icon flashing or E9 error

Possible Causes