Burning or electrical smell from the unit during operation.

Safety: Immediately turn off and unplug the unit if you smell burning plastic or see smoke. Do not continue to operate until inspected.

Steps:

• Visual inspection: After the unit cools, remove covers and inspect wiring, connectors, and the control board for discoloration, melted insulation, or burnt components.
• Tighten connections: Check terminal blocks and spade connectors for looseness and tighten as needed.
• Clean dust: Remove heavy dust buildup from coils and electrical areas with a vacuum and soft brush.
• Replace damaged parts: Replace any burnt wiring harnesses, motors, or control boards with Honeywell-approved parts.
• Professional service: If you cannot identify the source, have a qualified technician inspect the unit before further use.