It's not unusual for a furnace to make some noises, especially if you have an older model. You're likely to hear humming as the blower runs and some slight popping noises coming from the ducts. These noises are perfectly normal and not a cause for concern.
However, if your furnace starts making loud noises that you can hear all throughout the house, it's a clear sign that it needs attention from a professional furnace repair company. One of the biggest mistakes homeowners make is ignoring certain noises coming from their furnace. Doing so is likely to lead to furnace problems requiring extensive repairs or a complete replacement. By having your furnace serviced immediately upon hearing them, you can save big on the repair costs. Here is an overview of three furnace noises that should never be ignored:
Loud Scraping Sounds
Hearing loud scraping noises that resemble metal rubbing against metal or nails on a chalkboard are a sign that your furnace blower wheel is defective. Furnace maintenance repair professionals recommend that you immediately shut off your furnace and book an appointment with a service technician if you hear them. Ignoring these noises is likely to lead to damage to your furnace.
Scraping sounds are usually caused by one of these blower wheel troubles:
The blower wheel came apart from the motor shaft and is in contact with the casing. If the damage isn't particularly extensive, a simple tightening can be performed by a technician.
Your blower wheel is simply broken. In this case, a professional replacement is the only solution.
Your motor mount is broken and the entire blower assembly is in contact with the housing after falling off.
Strong Banging or Popping Noise Heard When the Furnace Is Powered On
There are two main reasons for these noises:
Dirt buildup on furnace burners. A lack of maintenance can result in dirt building up on the furnace burners, which delays the ignition process, causing gas to build up. This gas will eventually ignite as well, which is why you will hear a loud banging noise. If these gas explosions are allowed to continue, damage to the heat exchanger could result, which requires an expensive replacement.
Air ducts that expand and contract. Those with metal ducts are more likely to hear this kind of noise. As the blower is turned on or off, ducts will expand or contract. There are various explanations for this problem, including an air filter that has gotten clogged, closed vents, improperly sized ducts, or poor quality ducts.
High-Pitched Squealing or Whining Noise
If you hear high-pitched noises coming from your furnace, there are several possible explanations, including:
A defective blower motor that needs repair or complete replacement.
Shaft bearings that have insufficient lubrication and need oil to be applied by a service technician.
A blower belt that is frayed, loose or slipping. A service professional can make the necessary adjustments or replace the entire belt if needed.
If you hear any of these noises, it's a good idea to contact a furnace repair specialist as quickly as you can, as letting the problems go on for too long may lead to more serious issues with the internal components of your furnace.
Midpoint Cooling & Heating Can Help With Any Furnace Problem
There are many possible reasons as to why a furnace could be making unusual noises in addition to the examples shown above. If you hear any strange sounds coming from your furnace, don't hesitate to contact Midpoint Cooling & Heating so that one of our technicians can come take a look at it and make any needed repairs or adjustments.
We've been around since 1999 and pay close attention to customer satisfaction. Our honest, reliable and affordable approach to furnace repair and maintenance has made us a leading choice for HVAC services in Fort Myers, FL and the surrounding area. All of our service technicians are highly experienced and have the professional tools needed to work on any brand or model of furnace.