Kelvinator
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
Dirty burners reducing flame size, Low gas pressure to Kelvinator furnace, Incorrect thermostat heat anticipator or cycle rate, Oversized duct losses or uninsulated ducts
How to Fix / Troubleshooting
Safety first: Turn OFF power and gas before removing burner components. Gas pressure adjustments require a licensed technician.
- Filter and airflow: Replace the furnace filter and ensure all supply registers are open. Poor airflow can make rooms feel cool even if the furnace is hot.
- Inspect burners: With power and gas OFF, remove the burner assembly if accessible. Clean rust and debris from burner ports with a soft brush and compressed air.
- Thermostat settings: Check that the thermostat is set to HEAT and configured for a gas furnace (not electric) with the correct cycle rate. Refer to the thermostat manual.
- Professional gas check: If the furnace runs continuously but supply air is only lukewarm, have a technician measure gas input and verify Kelvinator-rated BTU output.
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Repair Difficulty
Medium
3/5
Required Part
Main Burner Assembly
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