Troubleshooting strange furnace noises and sounds

It’s late at night, on a cold night here in Albuquerque. Suddenly, you hear a screeching coming from your attic. Unless you have some kind of bat infestation, chances are that you’re hearing strange furnace noises and you may need heating repair.

A properly functioning furnace should not make too much noise. They’re designed to run quietly. A furnace that is making strange noises is most likely in need of repair. However, the type of sound can help determine the exact issue with the system.

In this blog post, we’ll run through some of the most common furnace sounds, and what they may signify. If you’re hearing any of these—or you’re unsure about what you’re hearing coming from your furnace—contact the pros at Wagner Mechanical. We’ll inspect your furnace and determine the exact issue.

Four strange furnace noises (and what to do when you hear them)

Albuquerque Furnace RepairHere are four common, but weird, furnace noises, and the most probable reasons for the sounds. Keep in mind that every furnace is different, so the only way to be 100% sure about the state of your furnace is to have the team at Wagner Mechanical inspect your system.

1. Scraping noises

A scrapping noise most likely means that there’s a fault in the blower wheel of the furnace. This noise will sound like metal parts rubbing together, or nails scratching  a chalkboard. Yeah, it’s not fun. You must call a furnace technician as soon as possible when you hear a scraping noise.

The blower wheel can be making the scrapping noise for different reasons. The wheel may have become loose and is making the noise by hitting the blower casing. Having a professional technician tighten the blower wheel can resolve the problem.

Sometimes, a broken blower wheel can also cause the noise. Moreover, the motor mount may have broken causing the blower assembly to hit the housing. This may also result in a scrapping noise.

2. Screeching noises

A screeching noise that comes from the furnace is most probably due to motor bearing problems. (Here’s what this sounds like)

The motor bearing issue can be solved by a technician strategically adding lubricant. This is something that you need to have Wagner Mechanical help with: your standard WD-40 is too lightweight to be used here, and we have a special lubricant that will stand up to the wear-and-tear of the furnace.

Another common cause of screeching sounds? A bad belt. You must have a technician replace the belt immediately, otherwise the blower will no longer run.

3. “Thwapping” Sound

A “thwapping” sound indicates that something is stuck in the blades of the blower. Moreover, this sound can also be heard when something is stuck inside the housing of the furnace. The sound is similar to the noise made by playing cards when they are attached to the spokes of a bicycle wheel.

You should get the unit checked by a professional technician to get the problem resolved. Not taking any action can cause strain on the motor, resulting in a major system breakdown.

4. Banging or popping noises

Banging or popping sounds are very common. Most of the time, these noises come from the air ducts. A popping sound is made when the air ducts expand and contract. While a minor popping noise is normal, a loud banging or popping noise could be a whole different story. If you hear either, call Wagner Mechanical.

When you hear strange furnace noises, call in the experts

Wagner Mechanical is your source for heating repair services in Albuquerque and Santa Fe, New Mexico. Our dedicated techs work with all makes and models, and we offer 24/7 repair services. No matter what strange furnace noises you’re hearing, give us a call today for an inspection.

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