Cointra
Short Cycling
Furnace cycles on and off frequently (short cycling), with very short 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 furnace, Thermostat located near heat source, Clogged filter or restricted airflow, Faulty high limit thermostat cycling
How to Fix / Troubleshooting
Safety: Turn off power before internal inspection.
Steps:
- Check thermostat location: Ensure the thermostat is not near supply vents, direct sunlight, or other heat sources. Relocation may be necessary.
- Clean filters and grilles: Replace or clean filters and ensure all grilles are open to improve airflow.
- Observe operation: Note whether the burner shuts off due to thermostat satisfaction or safety trip (fan continues running). Frequent safety trips require professional diagnosis.
Professional help: A technician should check furnace sizing, duct design, and safety device operation.
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Repair Difficulty
Medium
3/5
Required Part
High Limit Thermostat
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