Customer called for system pumping odor into home. Inspected full system as well as inspect attic for cause of odor with no success. I can definitely smell something but cannot pin point origin of odor. Tested all supply voltage lines and found no irregularities. No burnt wires or smoke stains on any of the equipment or in home. Odor was more present in attic but unsure if odor is coming from attic space or it’s warmer so the smell is more profound. Advised customer to monitor and report back and let us know if the smell disappears or not.