Responded to an urgent no-heat call for a renter in Philadelphia, PA 19142, whose gas furnace stopped heating two days ago. The igniter wasn’t glowing, and the home had dropped to unsafe temperatures, so we started with a full diagnostic on the basement furnace. We replaced the faulty thermostat, restored proper control communication, and verified system operation. During testing, we found that the furnace was overheating and short-cycling due to ductwork that doesn’t match the system’s airflow requirements—a major factor behind the shutdown. After completing the thermostat replacement and confirming safe operation, we reviewed corrective ductwork options to prevent future overheating and keep his family warm for the rest of the heating season.
