York
Short Cycling
Furnace short cycles: turns on and off frequently, runs for only a few minutes each time.
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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, Dirty flame sensor causing drop-out, Thermostat located near heat source, High limit opening due to airflow issues
How to Fix / Troubleshooting
Safety: Turn off power before cleaning sensors or opening panels.
- Thermostat location: Ensure the thermostat is not near supply registers, space heaters, or direct sunlight. Relocation may be needed.
- Clean flame sensor: Remove and clean the flame sensor to prevent nuisance flame loss.
- Airflow checks: Replace filters, open registers, and inspect for duct restrictions to prevent limit trips.
- Professional assessment: If short cycling persists, a technician should evaluate furnace sizing, gas input, and heat exchanger condition.
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Repair Difficulty
Medium
3/5
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