Performed annual maintenance on 2-year-old furnace under Family Rewards agreement. Conducted temperature rise test and identified error code indicating airflow restriction due to severely clogged air filter with mineral deposits from humidifier use. Advised customer to use distilled water or replace filter more frequently. Removed PVC shavings from condensate drain tubes, tested condensate pump, and verified proper system operation. Discussed options for UV light system and central humidifier installation. Inspected electrical panel and recommended cleaning service.
