Do Furnaces Make Noise? Top Troubleshooting Tips

Rima Chatterjee

Some strange sounds coming from a gas furnace can be a sign of issues. Banging, thwapping, popping, and buzzing noises are all indicators of metal parts wearing down. Scraping noises may mean a problem with the blower wheel or motor, while a dull hum or loud humming could indicate electrical component issues. Squealing can result from low airflow and clicking sounds can suggest ignition system concerns.

Do Furnaces Make Noise

If there is not enough air pressure on the heat exchanger, it can lead to cracks in the combustion chamber. This can cause damage to your home as well as pricey repairs. Ignoring these warning signs can lead to cold weather discomfort.

Estes Services’ HVAC technicians are experienced in every component of gas furnaces. We offer affordable services and repairs on all kinds of furnaces – from blocked filters to complete HVAC repair/replacement.

So, if you hear any odd noises coming from your furnace, contact us right away! Our professionals will quickly identify the issue and fix it for ensured safety.

Furnace Noises

  • Furnaces can produce various noises, some of which are normal and others that may indicate a problem.
  • Normal sounds include clicking or a low hum during start-up.
  • Unusual or loud noises should be a cause for concern and may require attention.
  • Popping or scraping noises could indicate issues with the blower wheel, motor, or lost parts.
  • Malfunctioning furnaces can pose a risk of carbon monoxide poisoning.
  • Loud banging noises during heating may be caused by delayed ignition or a cracked heat exchanger.
  • A low hum could indicate electrical problems or a faulty capacitor.
  • Insufficient airflow can result in a lack of warm air circulation.
  • It’s advisable to contact an experienced technician if you suspect any furnace issues.
  • Regular maintenance, such as changing air filters and checking for leaks, can help prevent costly repairs.
  • Proper lubrication of the blower motor and wheel, as well as inspection of electrical components, can optimize furnace performance.
  • Checking vents and air ducts for proper airflow is crucial in avoiding potential issues.

In short, understanding furnace noises will help you identify any problems and when they could lead to expensive repairs. Don’t wait until things get worse; contact an HVAC repair company at the first sign of trouble. With regular tune-ups and maintenance from Estes Services, noisy coils will be a thing of the past!

Causes of Furnace Noises

  • Common Furnace Noises:
    • Clicking: Occurs when the igniter heats up.
    • Banging: Caused by delayed ignition.
    • Low humming or thwapping: Indicative of worn bearings in the blower motor.
    • Buzzing or popping: Caused by electrical components.
    • Squealing: This can result from a dirty air filter.
    • Scraping or rattling: Caused by loose parts within the furnace.
  • Importance of Addressing Noises:
    • Neglecting furnace noises can lead to costly repairs and potential carbon monoxide poisoning.
    • If you hear peculiar sounds, it is advisable to call a professional technician.
  • Professional Inspection:
    • A technician will examine components such as the blower wheel, gas burners, heat exchangers, and more for signs of wear.
    • They will check air ducts and vents for leaks and assess the combustion chamber to prevent gas leaks or explosions.
  • Poor Air Pressure:
    • Insufficient air pressure is a common furnace problem that results in cold air instead of warmth during heating cycles.
    • Replacing fan belts or control panels often resolves this issue.
  • Potential Damage from Pets and Kids:
    • HVAC systems can be susceptible to damage from pets and children, so it is advisable to have a technician inspect them.

As an Estes Services HVAC technician, I know waiting on repairs often creates more significant problems in the end. I once inspected an old furnace making loud banging noises. After close examination, I saw screws from an interior panel had become loose over time due to the vibration from the burner assembly.

This resulted in serious damage to metal coils that needed complete teardown and replacement of most furnace components.

It’s clear from this list that many parts and scenarios can cause furnace noise. If you’re in doubt, contact a furnace technician for optimal comfort and safety this winter.

Types of Furnace Noises

Strange noises coming from your furnace? It’s time to call in an expert! Banging noise? Could be dirty burners or faulty gas flow. Humming? Blower fan or motor, air pressure issues, or loose parts. Scraping? Loose components or worn blower wheel bearings. Clicking? Air ducts expand and contract with warm air. Popping? Metal coils contract during cooling.

Don’t ignore these signs – costly repairs may be ahead if you do. Get professional help before it’s too late!

How to Fix Furnace Noises?

Furnaces can make various noises – from annoying to alarming! Most of these sounds have easy causes and simple fixes. Here’s a 4-step guide:

  1. Locate the noise source: Listen carefully and identify where it’s coming from.
  2. Common problems: Check for loose parts, dirty filters/burners, low airflow, and incorrect gas/ignition.
  3. Call a pro: If you don’t feel confident to fix it, contact an experienced technician. Complex repairs can be dangerous and costly.
  4. Regular maintenance: The best way to avoid furnace noises is to keep up with routine maintenance. Get yearly tune-ups to prevent more serious problems later.

Remember: Some noises could indicate serious issues like carbon monoxide leaks or damage to other furnace components. If hearing anything unusual or alarming, contact a pro right away.

Pro Tip: Change air filters every 1-3 months to reduce strain on the blower motor and improve comfort/efficiency in your home. Don’t ignore furnace noises – they may seem harmless, but they can lead to expensive repairs or even carbon monoxide poisoning!

Safety Concerns with Furnace Noises

Furnaces can be noisy. As a furnace technician, I’ve seen it all. While some sounds are normal, others are signs of serious issues that can lead to costly repairs.

  1. If you hear rattling, popping, humming, thwapping, or buzzing noises from your furnace, they could indicate loose screws, wear on bearings, something hitting the blower wheel, or an electrical problem.
  2. Banging noises from your furnace may indicate delayed ignition or gas flow issues, which should be addressed immediately to prevent potential explosions and serious damage.
  3. For safety, if you hear strange noises from your furnace, check for carbon monoxide leaks and be aware of symptoms like headaches and nausea occurring around the home.
  4. Prevent furnace noises by regularly replacing the air filter, clearing vents of obstructions, and adjusting the fan belt as needed.
  5. If you experience any concerns or unusual furnace noises, it is recommended to contact an HVAC technician. They can inspect and address issues such as gas burner problems, heat exchanger issues, combustion chamber leaks, and burner ignitions.

Good maintenance is key to avoiding spooky sounds and repair bills.


To keep your furnace in top condition, it’s vital. If you hear noises like scraping, banging, or popping, that’s a red flag and a pro HVAC technician is needed soon. Ignoring can lead to an explosion or pricey repairs. Over time, parts will wear out. So, regular check-ups and part changes are important to avoid damage. At Estes Services, we had a customer who had low airflow from an obstructed air filter. Our technician found a screw had gone through and damaged the fan motor. We replaced the parts and cleaned the air ducts, restoring the furnace. With these tips and regular maintenance with a professional, you can keep your heating system running for years and keep your home safe and warm during the cold winter months.

About the author

Debarghya Roy: A heating systems author, Passionate about energy efficiency and sustainability, Sharing insights and empowering readers through informative blog articles.