Carpet cleaner shows E13 and the heater function (if equipped) does not operate; water remains cold.

Safety: Unplug the unit and allow it to cool completely. Water and electricity are a dangerous combination; proceed with caution.

• Check heater wiring: Access the inline heater module (usually in the solution path). Ensure all spade connectors are tight and free of corrosion.
• Test heater element: Disconnect the heater and measure resistance across its terminals. An open circuit indicates a failed element that must be replaced.
• Inspect thermal fuse: Many heaters have an inline thermal fuse. Test it for continuity; if open, replace with the exact same rating and type.
• Check heater relay: On the main PCB, locate the heater relay. If the coil measures open or contacts are burnt, replace the PCB or relay module as designed by Vileda.