Daikin furnace emits a strong chemical or plastic smell during operation.

Safety: Turn off the furnace if you suspect electrical burning or melting plastic. Do not ignore persistent chemical odors.

Steps to check:

• Inspect registers and returns: Look inside supply and return grilles for plastic toys, bags, or debris that could be heated.
• Check blower compartment: With power off, inspect the blower motor and wiring for discoloration, melted insulation, or burnt smell.
• New installations: Some odor is possible from new duct sealants or furnace paint, but it should diminish after several hours of operation.

If the smell is strong or worsening, have a technician inspect the Daikin blower motor, wiring harness, and heat exchanger area for overheating components.