Luxaire Underfiring or Low Heat Output

Furnace runs but does not produce enough heat; home never reaches set temperature.

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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

Incorrect gas input rate, Partially blocked burners, Low manifold gas pressure, Incorrect blower speed too high

How to Fix / Troubleshooting

Safety: Gas input and pressure adjustments must be done by a licensed technician. Do not adjust gas valve screws yourself.

Homeowner checks:

  • Filter and ducts: Ensure filter is clean and all supply registers are open to allow proper airflow distribution.
  • Thermostat settings: Verify thermostat is not in setback mode or programmed to lower temperatures.
  • Check for drafts: Significant air leaks in the home can make the furnace appear undersized.

Professional tasks: A technician should verify Luxaire furnace input rate, manifold pressure, burner cleanliness, and blower speed tap settings.

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Repair Difficulty

Hard 4/5

Required Part

Gas Orifices and Burners
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