How to resolve bad blower motor symptoms in HVAC

Nowadays, it is common to have an HVAC system in one’s home. The main component of an HVAC system is a motor blower. In case of these motor malfunctions, we can see bad blower motor symptoms in HVAC. We can resolve Bad blower motor symptoms in HVAC at home. It depends on the depth of the issue.

This article will guide you about bad blower motor symptoms in HVAC and resolve them.

The blower motor is the main component of your HVAC system. Firstly, it blows conditioned air through your home’s vents. Secondly, it distributes the cold air produced by your air conditioner throughout your interior area. It guarantees that the temperature reaches the thermostat’s set point. It accomplishes this by rotating a fan, causing air to circulate through your home’s ducts and vents. The blower motor resistor controls the speed of the blower motor. Even a small engine may move a large amount of conditioned air.


Blocked Airflow:

If no airflow is happening from the vents, it may indicate that the blower motor has broken down to a point where it has completely stopped functioning. It means you will have to go for a replacement. But the stoppage of airflow could also occur because of a defective thermostat. Also, it can happen due to fan control issues, a bad battery, and a bad relay. The right way to identify the problem and fix it quickly is to call a qualified HVAC professional for help.

Airflow can also get blocked. We can solve this issue by contacting air duct dry fogging disinfection in Roswell.

They have the best cleaners. Moreover, they are not costly.

Unusual Increase In Energy Bills: 

In your HVAC system, the blower motor consumes maximum energy. If you find that your monthly energy bill is unusually high, it might be because of a faulty motor. An aging and problematic motor will have to work much harder to ensure proper air circulation in all the areas of your home. It will result in higher energy consumption. If your AC unit is worn out or has a one-speed blower motor, you may consider replacing it with a smart model with variable speed. This type of motor will adjust automatically to the varying cooling requirements of your home. Thereby cutting down your energy costs.

Weird Cluttering Sounds From HVAC:

The trouble with the blower motor could cause your HVAC unit to make strange sounds. A skilled HVAC technician can fix some of the problems that create strange sounds. But in other cases, the professional may also recommend you to replace the motor entirely. For instance, your blower motor may have the problem of damaged bearing or belt in this case. Your HVAC technician can repair this problem. But if the blower motor is making loud clunking or rattling sounds, it could mean more damage to the motor. Thus, necessitating a replacement.

Blower Motor Overheating:

Overheating of the blower motor can happen for a variety of reasons. Grime and dust can accumulate around the motor, causing it to overheat since it cannot vent itself. However, replacing the motor may be the best solution if the component has aged and is overheating.

There are also several benefits of mini split ducts.


There are six things you may perform to identify a furnace with a faulty blower motor:

Check That It Is Receiving Electricity.

If you don’t have the right voltage from the board, check the voltage at the outlet first. After that, check the transformer. Ensure high voltage is coming in and 24 volts flow out to the board.

Ensure the capacitor attached to it is in excellent working order. Whether you do it before or after you jump the blower motor briefly check the capacitor to determine if it satisfies manufacturer specifications. Replace it and retest if it does not.

Check That The Motor Isn’t Growing Too Hot To The Touch:

Some engines wear out and become filthy. If the blower becomes too hot, it may lock up and stop spinning. It may also continue to spin, but with an open winding within the motor, preventing the circuit from being completed.

Examine The Amp Draws:

Compare them to the information on the furnace sticker. To verify the amp rating, you may need to use a mirror or remove the motor. The OEM motor specs will be listed in the furnace’s service info handbook if you have access to it. And they differ quite a little. 4 to 12 people, depending on the size of the furnace and the type of engine used. If the amp draws are excessive, then either the motor fails and results in inconsistent functioning, or the static pressure presses back on the blower squirrel cage. It might be so significant that the motor is straining to produce the required air.

The Motor Will Not Turn On:

If the rotor that supports the fan blower wheel won’t spin or is difficult to spin, the blower motor is probably shot. Again, if the motor is receiving appropriate power and the capacitor is functioning properly, but the blower is not freely spinning, it may have seized, which is not unusual.

The Engine Is Spinning But Generating A Scraping Or Screaming Sound: 

The motor might be receiving the appropriate voltage, but it is making this horrible screaming noise. Check that the squirrel cage isn’t rubbing up against the side of the blower housing. Center the wheel within the blower housing. Re-tighten the locking nut to the rotor shaft, so it no longer slides.

Check The blower wheel’s spine. Repeated usage can detach it from its fins. It cups the air and directs it into the ducts. The air pressing against it will generate metal-on-metal friction, which will result in noise. The spine connected to the rotor shaft spins significantly faster than the separated wheel. Retest after replacing the blower wheel.

Filters And The Relevance Of Dirty Blower Motors:

I’ve seen blower wheels become so filthy that we need to clean them to start the air going again. The dust, filth, skin, and hair in the cups weigh down the wheel and pressure the motor. When it’s terrible like this (and you should notify your customer about it before you execute the blower cleaning), the clean wheel might become so light that the motor burns out since it’s been used to spinning a greater weight all along.

You may clean everything and have it running again. But you will need to be called out two weeks later due to malfunctioning of the blower because it spun out.

Your insurance company would not have had to pay for a new blower motor if you had covered all of your bases by communicating effectively with the consumer. It may appear dodgy if you didn’t—just something to consider.


I hope this blog article has provided you with some helpful tips to utilize in the field. One of the more difficult aspects of diagnosing a furnace is identifying a malfunctioning blower motor. However, if you know when it should switch on in the sequence of operation, you may proceed by verifying the items stated in this post.

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