Coleman
Short Cycling Due to Overheating or Oversizing
Furnace short cycles: starts, runs for a few minutes, then shuts off and restarts frequently.
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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
High limit switch opening from restricted airflow, Furnace oversized for duct system, Dirty blower wheel reducing airflow, Thermostat located in drafty area
How to Fix / Troubleshooting
Safety first: Turn off power before accessing blower or internal components.
Steps to check:
- Replace filter: Install a clean filter of the correct size and type.
- Inspect blower wheel: Remove the blower assembly and inspect the wheel for dust buildup. Clean with a soft brush and vacuum, taking care not to bend fins.
- Check thermostat location: Ensure the thermostat is not near supply registers, exterior doors, or heat sources that can cause rapid temperature swings.
- Monitor limit switch: If the high limit is opening (you may hear a click and see the burners shut off while the blower continues), airflow or sizing issues are likely. A technician should evaluate duct design and furnace capacity.
Persistent short cycling can reduce equipment life and should be corrected by an HVAC professional if basic airflow issues are ruled out.
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Repair Difficulty
Medium
3/5
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