This sound could be caused by the natural expansion and contraction of the heater's metal components as they heat and cool, which is common in many heating systems.
However, if the clicking is constant or unusually loud, it can suggest additional difficulties.
To fix this, first set the heater on a flat, stable surface to avoid internal misalignments. Next, turn off and disconnect the heater to let it cool entirely.
Once cooled, check the unit for any loose screws or components and tighten as necessary. Furthermore, gently wipe any dust or debris from the heater, as buildup can occasionally contribute to noise.
If your model has a timer feature, check if it's working properly, as a broken timer can generate constant clicking sounds.
If these methods do not cure the problem, you should contact De'Longhi customer service for further assistance.
You can contact them through their official website's help area, or check your user manual for region-specific contact information.
If you’ve faced a similar issue, don’t hesitate to share your story here. You can also file a complaint on Xolvie to help others in the same situation.