Trane Insufficient Heat Output

Furnace runs but house does not reach set temperature, long run times

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

Dirty burners reducing flame, Incorrect gas pressure, Undersized furnace for home, Leaking or uninsulated ductwork

Steps to check:

Filter and airflow: Replace dirty filters and ensure all supply and return registers are open.
Burner condition: Inspect burners for rust and debris; clean with a wire brush if accessible.
Duct inspection: Check accessible ducts in attic or basement for disconnections or major leaks.

When to call a professional: Gas pressure adjustment, combustion analysis, and load calculation should be done by a licensed HVAC technician.

Medium 3/5

Burner Assembly

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