Gibson
Short Cycling
Furnace short cycles, turning on and off frequently without long run times
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Safety Warning
This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.
If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.
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Possible Causes
Oversized Gibson furnace for home, Dirty filter causing limit trips, Thermostat located near heat source, Faulty high limit switch cycling prematurely
How to Fix / Troubleshooting
Safety first: Turn off power before accessing internal components.
Steps to check:
- Filter and vents: Replace the air filter and ensure all supply and return vents are open.
- Thermostat location: Make sure the thermostat is not near a supply register, fireplace, or in direct sunlight. Relocation may be needed.
- Observe operation: Watch the furnace through a cycle. If burners shut off and blower continues, then burners relight after a short time, the high limit may be opening. This requires a technician to check airflow and limit operation.
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Repair Difficulty
Medium
3/5
Required Part
High Limit Switch
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