Annual Gas Furnace Inspection Checklist
October 1, 2011
Annual tune-ups have as important a value for furnaces as they do for cars. The following checklist lists 15 steps every competent repairman should include in this tune-up service.
1. Check for proper pressure on gas valve.
2. Check for proper millivolt output of thermocouple.
3. Tighten and clean thermocouple connections.
4. Check setting of pilot (if the furnace doesn’t have electronic ignition). Flame should be high enough to generate current through thermocouple.
5. Tighten all gas connections. Check for leaks.
6. Thoroughly check heat exchanger for cracks and holes caused by high temperatures.
7. Remove and clean burners, reset, and adjust air shutters for a proper flame.
8. Check burner and pilot alignment.
9. Clean blower blades for full capacity. An extremely dirty fan may have to be dismounted and its blades washed with detergent in hot water. If it is washed, the fan should be coated with light oil before being replaced.
10. Oil motor bearings.
11. Check fan belt tension and wear.
12. Check fan and limit switch operation and settings.
13. Check flue for leaks and proper connection to outside vents.
14. Check thermostat location, operation, anticipation setting.
15. Check thermostat wiring for tight, clean connections.