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Why Is My Furnace Making Loud Noises

Why Is My Furnace Making Loud Noises?

Why Is My Furnace Making Loud Noises?

Your furnace is a crucial part of your home’s HVAC system, providing warm air and helping maintain a comfortable living environment. When it’s in working condition, your furnace runs quietly, heating the air within seconds with few noticeable sounds.

But on some occasions, you’ll notice that your furnace is making loud noises, a sound that is usually indicative of something wrong. Furnaces make loud noises for a variety of reasons, ranging from minor malfunctions to major problems.

In this article, we’ll go over the different reasons why your furnace may be making loud noises and some techniques for repairing them. By analyzing the cause of the sound, you’ll be able to better diagnose and fix the issue.

Common Noises You’ll Hear from Your Furnace

When talking about a furnace making loud noises, the terms “roaring” or “rattling” often come to mind. Understanding which sound your furnace is producing, though, can help you diagnose and fix the problem easier.


Roaring is a sound indicative of air turbulence or blocked airflow, similar to the noise that air makes traveling through a vent. It usually follows an increase in temperature or inner pressure due to worn out fan belts, dust, or a lack of oil in the blower’s motor.

If you hear your furnace roaring, it could indicate that the fan is out of balance or in need of lubrication. Another potential cause could be a shift in the furnace’s blower wheel or a jammed draft inducer.


Rattling usually occurs when a part isn’t connected securely or falls inside the unit. The noise could also be caused by a worn-out bearing, motor, or fan blades. If the furnace is old, this could be normal due to the age of the unit.

In the case that a part loosens or falls inside, it’s important to inspect the filters and internal components for any debris. The debris could be blocking various parts and components, creating excess friction and eventual noisy rattles.


Another sound that often comes out of furnaces is a squealing noise. This usually occurs when the motor’s belt is loose or the fan blades need lubrication. A squeak could also develop due to an obstruction keeping the blower wheel from turning.

Sometimes, a squeal could also be due to the furnace trying to turn on. The motor needs to be lubricated and inspected for any signs of wear and tear, as this will alleviate the sound.

If you’re still experiencing a squeal after inspections and repairs, the furnace may require professional attention.


Finally, grinding could be the sound your furnace makes when it’s in need of oil. The motor should be cleaned of dust and dirt and lubricated to ensure a smooth operation. Grinding could also mean that parts have worn out with use and because of intense, repeated strain.

In this case, professional inspection, maintenance, and repair is recommended. The technician should check the bearings and other components for any damage, replacement, or realignment.

Troubleshooting Furnace Noises

Since loud noises can indicate several issues, it’s important to perform a few tests to narrow down the cause of the sound. We’ll go over some ways you can identify and repair the issue.

Inspect the Filters

The filters may be clogged up with dirt, dust, pet fur, dander, or other debris. Inspect the filter for any signs of buildup or residue, and replace the filter if needed. It’s also wise to check for any stones, dirt, or small items that could have wound up inside the filter and cause it to become blocked.

Lubricate or Replace Parts

If the motor or motor bearings are making a loud noise, this means they need to be oiled or replaced. Try to identify which component is producing the sound, and lubricate or replace it.

Inspect the Blower Wheel

A broken blower wheel can cause grinding, rattling, and squealing, as the wheel may be obstructing other parts or becoming jammed. Make sure that the fan blade is firmly secured and in place. If the wheel is loose, you’ll need to tighten the bolts or replace the wheel entirely.

Check for Gas Leaks

The loudest noise your furnace will make is one that signals a potential gas leak. If you hear a loud hissing noise, switch off the gas valve immediately, ventilate your home, and call a professional to inspect the unit.

Contact a Professional

Different furnace noises usually mean different things, ranging from minor issues to major structural problems. That’s why it’s important to contact a professional to inspect and repair your unit.

If you need help getting your furnace back to its original working condition, call a local and reliable Appliance Repair at (866) 516-1222. Our team of HVAC technicians can inspect the causes of loud noises, fix any malfunctions, and help you maintain a comfortable, proper home.

As you can see, a furnace making loud noises is a sign that something needs to be addressed, whether it’s a problem with the filters, parts, or the blower wheel. It’s also important to contact a professional if you’re unsure of what to do or when the issue is beyond your understanding.

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Why Is My Furnace Making Loud Noises?
Why Is My Furnace Making Loud Noises?
Why Is My Furnace Making Loud Noises?

Furnace Making Loud Noises

Preventive Action to Avoid Furnace Making Loud Noises

Regular Furnace Maintenance – A key preventative action to avoid furnace making loud noises is to have regular furnace maintenance. This is especially important in San Diego's climate due to its hot summer months and cold winter months. By having regular furnace maintenance, any issues with the furnace can be identified early, preventing it from making loud noises and ensuring its proper operation.

Cleaning the Furnace and Its Parts – Another important preventative action to avoid furnace making loud noises is to clean the furnace and its parts regularly. Dust and debris can build-up on the furnace, leading to inefficiencies, loud noises, and poor performance. Cleaning the furnace and its parts help to ensure proper operation, which can help prevent loud noises from occurring.

Check and Replace the Filters – Checking and replacing the filters of the furnace is another preventative action for avoiding furnace making loud noises. By taking the time to check and replace the filters, dust, debris, and any other particles can be filtered out and not clog the air or circulate around the furnace. This keeps the furnace working properly, which can help prevent loud noises from happening.

Inspect the Blower – Inspecting the blower of the furnace should also be done as a part of routine preventative action for avoiding furnace making loud noises. The blower is responsible for circulating the air throughout the home and is a key component of the furnace. By regularly inspecting it, any problems with the blower can be identified and addressed before they cause loud noises.

Check the Ignition System – The last preventative action to avoid furnace making loud noises is to check the ignition system. The ignition system is responsible for igniting the furnace and any issues with it can lead to loud noises occurring. By taking the time to check the ignition system, any problems can be identified and addressed before they lead to loud noises.

Advice on Average Cost to Repair Furnace Making Loud Noises in San Diego

If you have a furnace making loud noises in the city of San Diego, you will want the best professional advice on the average cost of repair, installation, and parts.

The minimum repair or installation cost in San Diego can start from around $90 and can go up to $1100 or more depending on the complexity of the repair and the number or replacement parts needed.

Below is a list of some of the most common parts that could need to be replaced:

  • Blower motor
  • Blower wheel
  • Pressure switch
  • Thermal relay
  • Fan relay
  • Limit switch
  • Primary control
  • Heat exchanger

Repair costs are generally priced depending on the labor costs and the materials. Labor is typically priced by the hour, with average hourly rates ranging from $30 – $100 depending on the complexity of the repair. Materials are priced according to the replacement parts that are needed, with prices varying between $30 – $400.

Bear in mind that the repair or installation price may vary depending on the brand and size of the furnace. For further advice and/or troubleshooting always seek the help of a licensed professional.

For reliable advice and help on furnace repairs in the city of San Diego, contact Local Reliable Appliance Repair at (866) 516-1222.

Dealing With Furnace Making Loud Noises

Do you have a furnace that's making loud noises? That's one of the most common issues dealing with HVAC and appliance repair. Fortunately, Reliable Appliance Repair is a local San Diego HVAC and Appliance repair family-owned local company that focuses on providing quick and reliable services.

Reliable Appliance Repair offers same-day service for appliance and HVAC repair and installations. Their highly trained technicians have at least 5 years of experience in the field and are licensed and insured. As a first-time customer, you get to enjoy a $25 discount on labor.

Reliable Appliance Repair provides customers with fair and affordable prices for all repairs and installations. You can trust that your appliances and HVAC systems are in safe hands and you won't have to worry about any issues.

As a local San Diego vendor company, Reliable Appliance Repair constantly deals with furnace making loud noises and other issues. Not only will you get a quick and efficient solution for the problem but you can rest assured that all services are the best quality possible.

If you're dealing with stubborn furnace making loud noises, don't hesitate and get in touch with Reliable Appliance Repair right away. With their same-day service and discount for first-time customers, you won't regret getting professional help. Get your appliance and HVAC repairs done without hassle, now.


Why Is My Furnace Making Loud Noises?

The most common cause of loud furnace noises is a loose part or faulty component that is coming into contact with other portions of the appliance. Common issues include worn fan belts, bearings that need lubrication, or a faulty blower motor. Loose ductwork and dirty filters also may be the cause.

Furnace Making Loud Noises

A furnace may make loud noises caused by a variety of issues. Generally, such loud and unusual sounds indicate a problem with the motor, blower, or fan. Neglected maintenance could be the underlying cause. Any loud noises coming from the furnace should be checked by a licensed HVAC technician. Unusual noises should never be ignored, as they usually signal a serious malfunction.

For any questions or concerns regarding a noisy furnace, contact Local Reliable Appliance Repair at (866) 516-1222.