HVACopediaGoodman · Furnace troubleshooting
Check flame rollout switch
What is going on
Manual reset rollout switch on the burner bracket. It opens on flame rollout, flame impingement on the heat shield or over-firing. The blower runs continuously when it opens.
Likely causes
- Flame impingement on heat shield
- Orifice plate out of position
- Burners with excessive cross-over slot dimension
- Over-firing
- Improper orifices or gas pressure
- Air leaking around or through the heat exchanger into the burner compartment
Check in this order
- Shut off power and remove the burner compartment door.
- Press the manual reset on the rollout switch.
- Remove the wires from the switch.
- Check continuity across the switch with an ohmmeter.
- If it will not close after reset, replace it.
- Find and correct the cause of the trip before returning to service.
- Reinstall the burner door and verify operation.
Applies to: 90% upflow and counterflow 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)
- Annual inspection checklist
- Auxiliary limit control (location and purpose)
- Auxiliary limit switch open (blower compartment)
Take it to the job
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Source: Goodman GMVC96 service manual, p. 49. 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.