Keeprite Short Cycling

Furnace short cycles: starts, runs for a few minutes, shuts off, then 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

Oversized furnace, Restricted airflow causing limit trips, Faulty thermostat placement, Dirty flame sensor causing intermittent flame loss

How to Fix / Troubleshooting

Safety: Turn off power before working inside the furnace.

Steps:

  • Check filter and vents: Replace dirty filter and open all registers.
  • Observe LED codes: Watch the Keeprite control board LED during shutdown to see if a limit or flame fault is indicated.
  • Check thermostat location: Ensure thermostat is not near heat sources or supply registers.
  • Clean flame sensor: If codes indicate flame loss, clean the flame sensor as described in other entries.

If short cycling persists with proper airflow and thermostat location, have a technician evaluate furnace sizing and controls.

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Repair Difficulty

Medium 3/5

Required Part

High Limit Switch
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