Trane Overheating / High Limit Cycling

Furnace starts and runs but shuts off after a few minutes, then restarts after cooling

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

Restricted airflow from dirty filter, Closed registers, Undersized ductwork, Blower speed too low for heat rise

Steps to check:

Replace filter: Install a clean filter with correct airflow rating.
Open registers: Ensure all supply and return registers are open and unobstructed.
Duct inspection: Check for crushed or blocked ducts if accessible.

When to call a professional: A technician should measure temperature rise across the Trane furnace and adjust blower speed or ducting as needed.

Medium 3/5

High Limit Switch

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