Troubling Furnace Sounds and What They Mean | All Time HVAC

Did You Hear That? Troubling Sounds from Your Furnace & What They Mean

Our days are getting shorter, and temperatures are dropping. This means we’re reaching for the thermostat to crank up the heat. But, wait. What’s that sound?

Furnaces can make all kinds of sounds while operating, such as a pop or click when the heater turns on or whistling while the blower runs. But not all furnace sounds are normal. If you hear any of the following sounds while your furnace is heating your home, reach out to an HVAC expert for heating services in Morristown, NJ.


A bit of a popping noise is expected when the furnace fires on or changes cycles, but if this sound evolves into a banging noise, this could mean the furnace’s blowers are dirty. When this problem occurs, gas can accumulate in the furnace and cause the heat exchanger to crack. Because this is such a serious issue, it’s essential to call a heating professional as soon as possible.


Rumbling emitting from your furnace could mean the fuel is still burning in the combustion chamber even though the burners have stopped running. The fuel may continue to burn because of an issue with the pilot light, burners, or flame sensors. If the sound coming from your heating system is a rumbling noise, you will need help from an HVAC contractor because issues with one of these furnace components can increase the risk of carbon monoxide poisoning.

Grinding or Scraping

If your furnace is producing a grinding or scraping noise, it likely means the bearings on the blower motor are dry and need to be lubricated. An HVAC technician lubricates these bearings during furnace maintenance, so if you haven’t scheduled this service in a while, it’s time to do so.


Another sign that there’s an issue with the furnace’s blower motor is a squealing sound. This usually indicates a loose belt, but it may also point to a more serious problem with the blower.


Do you know that sound your washing machine makes when it becomes unbalanced? If your furnace makes a similar thumping, clunking sound, it means the blower wheel or motor is unbalanced, just like the washing machine. Because these parts of the heating system are so crucial to the proper functioning of the furnace, you should schedule repair services to fix this issue right away.


A soft humming noise while the furnace is running is normal. However, if the humming becomes loud and irritating, there may be a problem with the blower fan or capacitor. A heating technician can fix these parts for you.


As a furnace changes cycles, it will make a clicking noise, which is normal. However, if this clicking occurs throughout a single cycle, there may be a problem with the compressor or control panel.

What to Do When You Hear Unusual Furnace Sounds

It’s important to turn off your furnace when you begin to hear odd sounds emitting from the heater. Then, you’ll want to call your local HVAC company for furnace repair.

Our team of experts will come out to your home and inspect the furnace to find the source of the problem. We will quickly provide a solution to stop the irritating noise and allow you to heat your house effectively.

Contact All Time HVAC for repairs, replacement, and maintenance, including air duct cleaning, today!