5 signs of a bad furnace inductor motor and troubleshooting - Alpha Mechanical (2023)

When thecool seasonfinally arrives in sacramento, california, we retirewarm clothesand go to the thermostat to change it from cold to hot. We have started to raise the temperature from what it has been until now to something that will keep us comfortable as we move through the colder months.

However, at this particular moment, you realize that when you turn on the oven, you hear, smell, and feel what you expected! You may be having problems with your oven, but at this point you have no idea what it is, how bad it is, and what it will take to get it working again. When it comes to your heating system not turning on, you could be looking for a few reasons: it could be a BLOCKED SMOKE GAS, a DEFECTIVE PRESSURE SWITCH, or theOVEN INDUCTOR MOTORwas wrong!

In this article, we will seize the time.asolve furnace inductor motor problemsyprovide reasonable solutions or recommendationsfor you to consider. we willbriefly discuss the function of furnace inductor motorsysolve problems that can arise when it does not work correctly. we will toohelp you decideif the problem issomething you can diagnoseyourself or you will have tocall a technicianto get your oven working again.

what is heFunctionof
furnace inductor motor in an HVAC system?

Before you can get the comfort of warm airflow into your home, there are sequences of events that must occur between you setting the thermometer to your desired temperature and the vents blowing warm air. There are six main steps in the furnace operation sequence, they areThermostat→ Furnace inductor motor →oven pressure switch→ Ignitor → Gas valve → Flame sensor → Fan motor.

Today we want to focus on the furnace inductor motor and its importance in HVAC systems. Once you've selected your desired heat level, the inductor motor is the first thing you should listen to.The purpose of an inductor motor is to push combustion gases through your exhaust pipes out of your home.It is basically a motor driven fan responsible for removing any smoke or poisonous gases left in the exhaust pipes from the previous operation. When this fan works as it should, you can be sure that your oven will work more efficiently and safely.

self worthkiln draft inductor motor
maintenance and replacement

When it comes to preventing heat from running through the house, onearmature engineit's not something homeowners think about right away. To keep homeowners safe and comfortable when using the heating systems in their homes, furnace manufacturers build their products with various safety devices and sensors. Another way of seeing thearmature engineand soworks as a security featurewhich creates a negative pressure or draft that purges the heat exchanger of any poisonous gases, i.e. combustion by-products including carbon monoxide, out of your home through the furnace or furnace vent chimney.

If this is not maintained properly, you will experienceNO HOT indoors, your oven will start to smell like gas, or every time the fan is turned on it will make all sorts of weird noises. In many cases, there is only one way to troubleshoot a non-working furnace inductor motor and that is to replace the unit.

Heating by blowing cold air? Give us a call for a quick repair of your furnace!

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how to know if
Is a furnace inductor motor bad?

Set the thermostat to warm and see if the inductor motor turns on and you're experiencing something other than what you expect from the furnace, then it's time to try the following diagnostic techniques to get to the bottom of the problem:

  • Do you hear a rattling or rattling noise right after the heating cycle starts?
  • Or while the oven is on, do you hear hissing, loud buzzing or squeaking?
  • Does the oven turn on and off suddenly?
  • Oven burners just won't light?
  • When you open the oven you seeflashing led lightsshowing an error code sign?

These are the 5 reasons why your oven inductor motor is not working as it should:

1. Filter or ventilation block

When general heater maintenance is not done, it can affect not only the efficiency of the unit, but also the heater unit itself. Be sure to clear the vents of any blockages and replace the filters regularly. We can help you with some of that if you sign up for ourservice membership plan.

2. No energy coming out of the capacitor

Some motors have a capacitor that turns the motor on and regulates the voltage while it is running. If it's a bad capacitor, a new one should get it working again.

3. Unit age

A furnace inductor motor lasts an average of 15 years. Annual maintenance is the best way to extend the life of the furnace inductor.

4. Worn inner bearings

One of the reasons the motor shaft seizes is that the bearings in the motor can seize and prevent the motor from turning. This can happen due to the age of the equipment or excessive wear and tear, especially when the system is not taken care of as it should, resulting in the engine overheating.

5. Broken fan blades or loose, rusty, or unbalanced motor wheel

If you hear a rattling, knocking, chattering, knocking, shaking, wobble noise, it means that something inside the motor or fan blade is faulty and needs to be replaced. If the actual engine flywheel or squirrel cage cannot turn when you try to turn it by hand, it means that the engine balls need to be replaced.

Oven in its last stage? Call us for a quality furnace replacement!

tell me more

when to performfurnace inductor motor
troubleshooting and when to call a professional?

You will want to learn more about the furnace inductor and understand its role in the HVAC system before trying to troubleshoot the problem yourself. In addition to what you've learned in this blog, there's a lot of great material online to give you a feel for the basics. Manufacturers have gotten very good at providing customers with quality oven products. They have built many failsafe elements into their systems to help customers experience convenience and security.

Furnace inductor motor does not work as it should

Here are typical steps the system will take to notify you that something is wrong with the drive:

If the inductor motor does not turn on when it should, the oven will recognize this and turn off. The system will wait a while and try again. It will attempt to start about 4 times, after which the control board will stop sending voltage to the inductor motor, basically preventing it from attempting any more starts.

If you need help with a diagnosis in"why your oven's inductor motor doesn't turn on as it should"Or do you want a replacement? We can go out and test and replace the new inductor motor.

Hire Alpha Mechanicfor you
next furnace repair or replacement project!

Alpha Mechanical has been in business for many years in the Sacramento area. We are committed to providing exceptional service to our customers.We never seek to sell unnecessary equipment or defraud our customers financially when it comes to their HVAC units.Our technicians know how to test inductor motors in the furnace and how to replace them if they are broken.

Usoffer coupons and financingfor your convenience through associated banks. We take the time to communicate to our customers the problem with their oven and guide them to optimal and reasonable solutions at a competitive price.

final thoughts

By now you are aware of part of the important role that the furnace inductor motor plays in the comfort and safety of your home. We talked about it when"The induction motor of the oven does not work"As it should be, it is due to several contributing factors such as the age of the unit, problems with the power supply, other sensor failures, airway blockages or a simple failure of the motor and fan internals.

As always, we are here to help!We understand that these things fail at the worst time of year. Just when we try to get comfortable and escape the cold outside, we feel cold inside the house.Alpha Mechanical specializes in HVAC systemsand we've seen it all.

contact us916.848.5980 and we'll get your heating system working again.

Common questions

Common questions

What are the symptoms of bad inductor motor?

The most common signs of a faulty furnace inductor motor are knocking noises that result from dirt or grime accumulating around the fan shaft. You may also hear rattling or clicking noises, now these are the symptoms ofBAD draft inductor motor.

Alpha Mechanical HVAC Company provides excellent customer service in the Sacramento area when it comes to furnace repair or replacement.

How can I tell if my oven induction motor is overheating?

You might be thinking,“Why is my furnace inductor motor hot?”Well these engines are designed to run at high temperatures as they have to remove smoke and other harmful gases. Then the new ones are equipped with the ability to shut down before catching fire.

However, the most common reason for the furnace inductor motor to overheat is that there is a failure in the fan blades or bearings and this is preventing the fan from working as it should.

Why do I hear the noise of the oven inductor motor when turning on?

Here is an importantFurnace Inductor Motor Troubleshooting Tip:Pay attention to the sound of the unit. If you hear a grinding noise, then you need to replace the furnace inductor motor because something is probably broken inside.


How do you know if your furnace inducer motor is bad? ›

Tapping noises are one of the most common signs of a bad inducer motor. These noises may be the result of dirt or soot collecting around the fan shaft. They might also come from the bearing in the motor clicking together. Vibrating noises are another sign of a bad inducer motor.

How do you test a bad inducer motor? ›

To determine an inducer motor's failure, we need to verify the proper voltage is being sent to it. If the motor has proper voltage, the capacitor tests good and is not turning on, the motor is bad. If it's making a lot of noise, the homeowner should know the part is working but is on borrowed time.

What causes furnace inducer motor to fail? ›

Most inducer motors failures are simply attributed to the older age of the furnace. In most cases, the internal bearings wear out and since the unit is a sealed unit, there is no way to repair the original motor. Instead the unit is simply replaced with a new one.

When should a draft inducer motor be replaced? ›

When a draft inducer motor stops working, the entire gas furnace will cease operation, so it's important that you replace it as soon as possible. A loud whining noise is characteristic of a failing draft inducer motor, as the bearings inside are wearing out.

How long do furnace inducer motors last? ›

Furnace inducer motors can have a life expectancy of 12-15 years. A replacement furnace inducer motor can cost around $800.

What happens if inducer motor is bad? ›

A failing inducer motor may create a noise shortly after a heating cycle begins. This could be a tapping noise, or a humming or whirring sound. If the unit will turn on but the blower motor is not turning on, there are a couple of ways to check if the draft inducer motor has gone bad.

How much does it cost to replace an inducer motor on a furnace? ›

A replacement draft inducer motor will cost between $500 and $700. These motors are specific to manufacturers, so it can be harder to find the exact model needed. Technicians may not have the specific model on hand during emergency repair jobs at odd hours. Repairs cost less, with prices ranging from $250-$450.

How do you test an electric furnace motor? ›

To test a blower motor with a multimeter, first set the multimeter to the "resistance" or "ohms" setting. Then, touch the probes of the multimeter to the terminals on the blower motor. If the resistance reading is infinite, that means there is an open circuit and the blower motor is defective.

What does an induction motor do on a furnace? ›

The inducer motor turns on and draws combustion air into the furnace. This helps to make sure the gas is burning efficiently.

Does a furnace inducer motor have a capacitor? ›

A furnace capacitor helps regulate power input to the motors located in your furnace. These motors can include blower motors and, in some cases, inducer motors. Visually, a furnace capacitor is a small component that you may see mounted on the blower fan compartment in some furnaces.

Do furnace inducer motors make noise? ›

Noisy Draft Inducer

A draft inducer (or vent blower) is the most common problem on a gas furnace or boiler to cause a noticeable noise. It's the first sequence of events upon a call for heat, and it runs through most of the heating cycle.

What are the signs of a bad capacitor? ›

Here are some common symptoms of a bad AC capacitor.
  • AC Not Blowing Cold Air. An air conditioner that doesn't blow cold air is one of the first signs of a problem many homeowners notice. ...
  • High and Rising Energy Bills. ...
  • Humming Noise. ...
  • Old HVAC System. ...
  • AC Turns Off On Its Own. ...
  • AC Doesn't Turn On Immediately. ...
  • AC Won't Turn On.
May 16, 2018

What happens when a furnace capacitor goes bad? ›

A faulty capacitor might cause the furnace to become too hot internally, tripping a safety switch. If that happens, expect the furnace to shut down temporarily. If the blower runs slowly or becomes hotter than expected, it's letting you know the capacitor is not holding its charge.

What happens when a pressure switch fails on a furnace? ›

If the pressure switch doesn't activate, the furnace will then shut down, wait a bit, and try again. If the pressure switch doesn't close after 3 to 5 tries, the control board will stop sending voltage to the inducer motor, essentially locking it out from attempting it anymore.

How do you lubricate a furnace inducer motor? ›

Furnace Maintenance

If the motor has oil ports, it should be lubricated annually. Apply two or three drops of 10-weight nondetergent motor oil (not all-purpose oil) to each port. Do not overlubricate. If the blower shaft has oil ports, it, too, should be lubricated annually, following the same procedure.

What safety protects a furnace if the inducer motor fails? ›

A furnace pressure switch is an automatic safety feature located near the motor. It shuts the furnace down if it senses negative pressure created by the draft inducer motor. This protects your home from dangerous backdrafting, which is when exhaust fumes are reintroduced into the system.

What is the most reliable furnace brand? ›

The 5 best furnaces of 2022
  • Trane furnaces. The Better Business Bureau has given Trane a B rating and its customers have reviewed how truly efficient this furnace is. ...
  • Lennox furnaces. ...
  • Goodman furnaces. ...
  • Rheem furnaces. ...
  • Bryant furnaces.
Dec 19, 2022

How often do furnace motors need to be replaced? ›

Even though the manufacturer states their blower motor will last two decades, we advise all clients to expect a 10-20-year life span due to age, use, and proactive maintenance.

Should I replace my 25 year old furnace? ›

The answer depends on a number of factors, but most furnaces will work reliably for about 15 to 20 years. With proper maintenance, some can last as long as 30 years. But eventually, no matter how well you care for it, your furnace will reach the end of its lifespan and you'll need to replace it.

How do I know if my draft inducer is bad? ›

If your inducer motor goes bad, you'll typically be able to tell by the noise. Right after your furnace turns on for a new heating cycle, it could cause a tapping, buzzing or humming noise. However, if the inducer motor completely goes bad, your furnace will just shut off and stop working.

How much does it cost to replace inducer motor on Lennox furnace? ›

Lennox Inducer Motor Replacement Cost

The average cost of a Lennox inducer motor replacement is between $800-$1800.

Why is my inducer motor not closing pressure switch? ›

If the pressure switch does not close, do a visual inspection of the inducer assembly paying close attention to the hose between inducer motor and pressure switch. Look for gaps around the inducer assembly; the gasket or high temperature silicone must make a complete seal.

How much is a capacitor for furnace blower motor? ›

Additional Parts

Other blower mechanical parts and the cost to replace them include the following: Blower capacitor: $150 to $450 (including labor)

How much does it cost to replace a capacitor on a furnace? ›

The cost is determined by the brand, model, and whether the machine is single- or dual-run. A capacitor replacement costs roughly $170 on average, while some AC capacitors can cost up to $400.

How do you troubleshoot an electric furnace? ›

5 Electric furnace troubleshooting tips
  1. Check the electric furnace switch. Go and confirm that the electric furnace switch is turned on. ...
  2. Check the circuit breaker. ...
  3. Check for blown fuses. ...
  4. Adjust your thermostat. ...
  5. Clean the filters and air ducts. ...
  6. Faulty fan or blower. ...
  7. Check for loose AC parts. ...
  8. Belt issues.
Sep 14, 2020

How do you know if it's the blower motor or resistor? ›

Here are some common signs that your vehicle's blower motor resistor is bad:
  1. Loss of HVAC fan control (total or certain speeds)
  2. The fan only works on its highest speed setting.
  3. No air coming from vents.
  4. Intermittent or inconsistent fan speed.
Jan 30, 2022

What are the important characteristics of induction furnace? ›

The induction furnace is an electrical furnace in which the heat is applied by induction heating of metal. It is divided into two types: coreless induction furnace and channel induction furnace. The capacities of Induction furnace from less than one kilogram to more than one hundred tons.

Where is the inducer motor on a furnace? ›

A draft inducer is a fan that's located inside of your furnace near the heat exchanger. When your furnace begins a heating cycle, the draft inducer is one of the first devices that turns on. In fact, the draft inducer starts up 30-60 seconds before the burners are lit and continues to run throughout each heating cycle.

What are the two types of induction furnace? ›

There are two main types of induction furnace: coreless and channel.

Do induction motors have start capacitors? ›

Motor start and run capacitors are used in single-phase AC induction motors. Such motors are used whenever a single-phase power supply is more practical than a three-phase power supply, such as in domestic appliances.

Why does an induction motor need a capacitor? ›

Purpose of Motor Capacitors

A motor capacitor is an electrical storage unit that stores and releases energy to increase the current to one or more copper windings of a single-phase motor to create this extra boost and increase the motor torque.

Why is my furnace making a whirring noise? ›

But if you hear a loud humming or buzzing sound coming from your furnace, it usually means your furnace has an electrical problem. The most common electrical issues that cause a humming or buzzing sound include: A failing blower motor capacitor. An aging or unlubricated blower motor.

Why is my furnace making a high-pitched noise when I start it? ›

Whistling Noises

The blower may sometimes develop low airflow issues. Low airflow may cause the blower to strain to draw in enough air to be heated, resulting in whistling. If your furnace starts making a high-pitched whistling sound, consider changing your air filter or opening all vents to resolve the issue.

How do you troubleshoot a HVAC capacitor? ›

An HVACR capacitor can be tested after turning the power off, disconnecting the wiring, and bleeding off any leftover voltage before testing. This can be done with a multimeter on the uF or MFD setting. On a run capacitor, most of the voltage will drain off from the capacitor during the off cycle of the motor.

What is the average cost to replace an inducer motor on a furnace? ›

A replacement draft inducer motor will cost between $500 and $700. These motors are specific to manufacturers, so it can be harder to find the exact model needed. Technicians may not have the specific model on hand during emergency repair jobs at odd hours. Repairs cost less, with prices ranging from $250-$450.

How much does an inducer motor cost for a furnace? ›

The cost range to replace a draft inducer motor in your furnace is between $245 to $1,065, depending on whether the parts and/or labor are covered by the furnace manufacturers warranty or not.

Can you lubricate furnace inducer motor? ›

Furnace Maintenance

If the motor has oil ports, it should be lubricated annually. Apply two or three drops of 10-weight nondetergent motor oil (not all-purpose oil) to each port. Do not overlubricate. If the blower shaft has oil ports, it, too, should be lubricated annually, following the same procedure.

Why is my furnace making a vibrating noise? ›

Another noise that indicates furnace repair is a loud vibrating or thumping noise. Again, you should call a professional to get your heating system checked if you hear this noise. The noise is usually caused when the motor becomes out of balance. The vibrating noise may also occur due to an unbalanced blower wheel.

Why is my furnace making a high pitched noise when I start it? ›

Whistling Noises

The blower may sometimes develop low airflow issues. Low airflow may cause the blower to strain to draw in enough air to be heated, resulting in whistling. If your furnace starts making a high-pitched whistling sound, consider changing your air filter or opening all vents to resolve the issue.

Why is my furnace so loud when it kicks on? ›

It's normal for loud banging sounds to originate from ducts as the furnace starts up – it's just the sound of the metal ductwork expanding and popping. This is sometimes called oil canning.


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