HVACopediaGoodman · Furnace troubleshooting
Annual inspection checklist
What is going on
The furnace should be inspected by a qualified installer or service agency at least once a year, at the start of the heating season. Check the flue, combustion air intake, heat exchanger, burners, drainage, wiring and filters.
Check in this order
- Check the flue pipe for blockage or leakage, including the outside termination and connections at the furnace.
- Check the combustion air intake pipe (where used) for blockage or leakage, including its termination and connection.
- Check the heat exchanger passages for corrosion or buildup.
- Check the burners for proper ignition, burner flame and flame sense.
- Check the drainage system and hose connections for blockage or leakage.
- Check electrical connections for tightness and corrosion, and check wires for damage.
- Check and replace the air filter.
Applies to: All 34.5in chassis gas furnaces
More furnace guides
- Airflow lower than demanded, furnace runs on low stage when high stage is expected
- Alternate combustion air opening (upflow or horizontal)
- Alternate vent/flue location (upflow or horizontal left)
- Auxiliary limit control (location and purpose)
- Auxiliary limit switch open (blower compartment)
- Blower motor does not have enough information, fails to start 40 consecutive times
Take it to the job
All guides, error codes and tips work offline in the HVACopedia app.
Source: Goodman GMVC96 service and troubleshooting manual, p. 38. Written in our own words; check the manual for your exact model.
For licensed technicians. Gas, electrical and refrigerant work must be done by a qualified, licensed person. Shut off power and gas before servicing, never bypass a safety control, and follow the manufacturer’s manual for the exact model; it and local codes always take priority. HVACopedia is not affiliated with any manufacturer; brand and model names only identify the equipment.