Error 06 appears; water temperature on the display is unrealistic (very high or very low) and burner does not operate correctly.

Safety: Disconnect power and close the cold water inlet valve before removing any DHW components.

• Locate DHW NTC: The DHW sensor is usually on the hot water outlet pipe or integrated into a DHW manifold on Immergas water heaters.
• Check mounting: Ensure the sensor is firmly clipped to the pipe or inserted fully into its pocket. A loose sensor can misread temperature.
• Inspect wiring: Follow the cable back to the control board, checking for damage or loose connectors.
• Descale outlet section (if accessible): If the outlet pipe is heavily scaled, temperature transfer to the sensor may be delayed. Consider descaling the DHW circuit using a pump and approved descaling solution, or have a technician perform this.
• Replace DHW NTC: If readings are clearly wrong, install a new Immergas DHW NTC sensor.

Note: Incorrect DHW temperature sensing can cause scalding or lukewarm water; verify operation carefully after repair.