A common problem
A dusty or damp smell is often related to contamination, but a burning smell can signal a hazard. Identify the situation and do not spray chemicals into the unit.
Start with these steps:
Switch the unit off and inspect accessible filters as directed by the manufacturer.
If the manual allows it, wash the filters with water and let them dry completely before refitting.
Ventilate the room and note whether the smell occurs only in a particular mode.
If the smell remains after filter cleaning, returns quickly or seems to come from the drain, request professional cleaning and inspection.
If you smell burning, switch the unit off and do not restart it. Do not spray perfume, bleach or harsh cleaners inside the air conditioner.
A better project. A cleaner installation. Fewer unforeseen costs during construction.
