malfunctioning furnace in Louisville, KY

Symptoms Exhibited by a Malfunctioning Furnace

January 30, 2022

Unpredictable winter weather in Louisville, KY will make you turn to your furnace for relief. A gas furnace is the most energy-efficient type of heating system to keep your home comfortable throughout the winter season. While furnaces operate without issue most of the time, if you notice any of these symptoms, you might have a malfunctioning furnace.


Short-cycling happens when the furnace turns on for 30 seconds or less, turns off, then turns on again. This may happen due to a pilot that goes out, explains Coyne College. Another possible cause is a malfunctioning sensor, safety limit switch, or gas supply valve. If you notice that your HVAC system is short-cycling, you’ll likely need professional HVAC repairs.

Unusual Sounds

A malfunctioning furnace may make unusual or loud sounds. If you hear sudden banging, hissing, popping, grinding, or screeching sounds, turn off your furnace and call for urgent HVAC repairs. Loud humming, dinging, or pinging sounds are also signs of trouble and should be investigated by a qualified HVAC technician.

Carbon Monoxide Alerts

Every home with natural gas should have a carbon monoxide detector on each level. If the carbon monoxide alarm issues an alert, this is a sign of a malfunctioning furnace or other gas appliance. Leave your home immediately. Once you’re outdoors at a safe distance away from your home, call for emergency furnace repair services.

Poor Temperature Control

Malfunctioning furnaces do a poor job of maintaining a consistent indoor temperature. You may notice that cool or lukewarm air blows from your home’s vents. Some rooms may not have any airflow at all. If your furnace turns on and won’t turn off, this may be due to it not reaching the temperature set point on your thermostat. If your home is too cold, the furnace may need repairs.

To learn more about the symptoms of a malfunctioning furnace, take a look at KLM Heating & Cooling’s professional HVAC repairs, or reach out to us today.

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