Trane Short Cycling

Furnace short cycles, turning on and off frequently without reaching temperature

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.

Possible Causes

Oversized furnace, Dirty air filter causing high limit trips, Faulty thermostat placement, Blower speed set too low

How to Fix / Troubleshooting

Steps to check:

Replace filter: Install a clean filter and ensure proper airflow.
Thermostat location: Make sure the thermostat is not near heat sources, supply registers, or in direct sunlight.
Observe LED codes: Watch the Trane control board for high limit or other fault codes during cycling.

When to call a professional: If short cycling continues, a technician should evaluate furnace sizing, blower settings, and safety switch operation.

Repair Difficulty

Medium 3/5

Required Part

High Limit Switch

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