How to Know If Furnace Blower Motor Is Bad

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If you’ve owned a furnace for a while, you may have noticed some performance concerns. Mainly if you haven’t performed routine maintenance in a time, you may see specific tell-tale indicators. Even if there are no symptoms at the moment, you should monitor your furnace’s motor. Both direct drive and belt drive motors are prone to amortization and difficulties over time, which is why routine inspections are necessary.
What, therefore, should you be looking for?

bad motor

How can I determine if my furnace’s blower motor is defective?

There are five primary indicators of a failing furnace blower motor to look for:

Vents have insufficient airflow: Weak airflow can indicate other issues, such as worn-out air filters, but motor troubles are also possible. Vents are entirely jammed. It, too, can be caused by other problems but is a standard indicator of a malfunctioning blower motor.
Strange noises. Screeching and squealing sounds typically indicate that the motor’s bearings are worn, or the belt is damaged. On the other hand, clanking and slamming noises frequently suggest loose components. Thunderous bangs may indicate that something has become disconnected or broken.

A hefty utility bill: The blower motor is the component of your HVAC system that consumes the bulk of its energy, so when it becomes old, faulty, or ineffective.

Overheating: Numerous issues might cause your motor to overheat, and each one must be handled immediately. Ideally, your routine check-up will catch the condition before it deteriorates to the point of overheating, but if it does, you’ll need to act quickly.

What Causes a Blower Motor in a Furnace to Fail?

In a word, oblivion: We’re not judgmental; HVAC maintenance is inconvenient and easy to overlook, especially if you’re a young homeowner. However, missing routine maintenance checks, failing to replace air filters, and disregarding the HVAC system’s early airflow, noise, and energy-efficiency indicators can be hazardous to the motor. Additionally, other problematic components such as a damaged capacitor, loose wires, transformer failures, failed valves, and thermostat control issues, among others, can increase the motor’s workload. How to know if furnace blower is bad

Is it Safe to Use a Furnace that Has a Defective Blower Motor?

Certainly not. A defective motor can result in a variety of complications — it can create electrical problems and blown fuses, and the overheating can even spark a fire. Suppose you’ve neglected the maintenance requirements of your HVAC system and its blower motor for an extended period to the point that the engine has been damaged. In that case, it’s essential to contact a professional immediately. Which is the best furnace repair near me?

Signs of a Bad Blower Motor Resistor

The blower motor resistor guarantees that your blower motor fan does not run continuously at maximum speed how to determine if your blower motor resistor is defective. When you sit behind the wheel of your vehicle, you expect the temperature controls to operate following the manufacturer’s specifications. What happens, then, when the system does not blow as much air as you require? A faulty heater blower motor resistor could cause the problem in rare circumstances.

Additionally, we present the replacement cost, which will help you assess whether the item is worth repairing. Let’s begin by discussing the warning indicators to look for:

The most common sign of a defective blower motor resistor is that the blower motor operates at only one or two speeds. Additionally, it can cause the blower motor to shut down altogether, resulting in no air escaping from the vents.

Symptoms of a Faulty Blower Motor Resistor

Blower Motor Has Only One Speed. One of the most prevalent signs of a blower motor resistor problem is when the fan becomes stuck in one setting. Because the blower motor resistor controls the fan speed, and inability to change it may indicate a problem.

If the resistor fails or the circuit is shorted, the blower motor may become stuck at a certain speed. While you can continue to use the air conditioner or heater at its current rate, you’ll want to repair it to restore full performance. Malfunctioning HVAC components can also cause this symptom. You may wish to check the motor and fan switch connections to ensure they are not faulty.

Various Airflow Settings Are Ineffective

On the other hand, you may notice that the fan operates in a limited number of settings. The blower motor resistor is not required when the system is turned off. It holds even when the blower motor is set to maximum speed. On the other hand, the different settings need the resistor to regulate the flow. A faulty blower motor switch may also cause this situation. As a result, you may want additional diagnoses to ascertain which component is at fault.

No Air Coming From the Vents

When the resistor fails, you may be unable to force air out of the vents. The blower motor resistor regulates the power supplied to the blower motor in the system. When it fails, it has the potential to shut down the engine completely. You’re left with a heater or air conditioner that has no heat or cool air through the vents.

The blower motor resistor is an electrical component of the HVAC system. It regulates the speed of the blower motor’s fan. When you alter the fan speed on your vehicle’s instrument cluster, the resistor controls the speed at which the blower motor works.