Indoor unit blows air but there is a noticeable chemical or burning smell.

Safety: If you smell burning plastic or see smoke, turn off the unit immediately at the breaker and do not use it until inspected.

Steps:

• Initial use smell: A slight odor during first use of the season may be dust burning off and should dissipate within an hour.
• Inspect indoor unit: With power off, remove the cover and look for discolored or melted plastic, burnt wiring, or scorch marks on the PCB.
• Check filters and coil: Clean any heavy dust buildup that could be overheating.
• Professional inspection: If the smell persists or is strong, have a technician inspect wiring, PCB, and motors for overheating and replace damaged components.