Tempstar Short Cycling Due to Overheating or Control Issues

Furnace starts and runs for a few minutes, then shuts off and restarts frequently (short cycling).

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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

Dirty air filter, Oversized Tempstar furnace for duct system, Faulty thermostat placement (near heat source), Weak high limit switch

How to Fix / Troubleshooting

Safety: Turn off power before opening panels.

  • Step 1 – Replace filter: Install a clean filter of the correct size and MERV rating. Avoid overly restrictive filters.
  • Step 2 – Check vents: Ensure all supply and return vents are open and unobstructed.
  • Step 3 – Inspect thermostat location: Make sure the thermostat is not near a supply register, in direct sunlight, or near heat-producing appliances. Relocate if necessary.
  • Step 4 – Monitor operation: After corrections, run the furnace and see if cycles lengthen. If short cycling persists, have a technician evaluate furnace sizing, ductwork, and the Tempstar limit switch.
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Repair Difficulty

Medium 3/5

Required Part

Tempstar High Limit Switch
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