Gibson
Underfiring or Insufficient 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
Low gas pressure to Gibson furnace, Partially clogged burners, Incorrect orifice size, Blower speed set too high for heating
How to Fix / Troubleshooting
Safety first: Gas pressure and orifice sizing must be checked by a licensed technician.
User checks:
- Filter and airflow: Ensure the filter is clean and all registers are open. Poor airflow can make the system feel underpowered.
- Thermostat calibration: Compare thermostat reading with a separate thermometer to rule out thermostat error.
- Observe burner flame: Through the sight glass, check that all burners light evenly and flames are steady and mostly blue.
If the furnace still cannot maintain temperature, a technician should verify input BTU, gas pressure, and blower tap settings.
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Repair Difficulty
Medium
3/5
Required Part
Burner Assembly
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