Can You Bypass Inducer Motor On Furnace? A Complete Guide


When it comes to bypassing the inducer motor on a furnace, it’s not recommended. The inducer motor is an important part of the furnace’s function and bypassing it can cause issues such as carbon monoxide leaks, inefficiency, and safety concerns.

However, if there are specific reasons why bypassing the inducer motor is necessary, there are steps to take.

Step 1: Turn off the power supply to the furnace.

Step 2: Locate the pressure switch and remove the two wires connected to it.

Step 3: Connect those two wires together using a jumper wire.

Step 4: Turn the power supply back on.

Step 5: The furnace should heat up. If it doesn’t, there may be other issues.

Step 6: Contact an experienced HVAC professional to accurately diagnose and fix any issue without causing further damage or harm.

It’s essential to note that bypassing the inducer fan usually goes against local or national building codes and requirements. You may think you save money, but proper troubleshooting and repair can cost around $400-$500, while replacing them altogether costs $700-$800.

In case you encounter any issues with your furnace pressure switch, always seek expert assistance. Otherwise, you could end up with increased electrical consumption and higher chances of parts failure, as well as possible danger.

Only licensed HVAC technicians or certified HVAC tradesmen should work on furnace inducer fan motor assembly. Otherwise, you could end up with an upfront fee and future consequences in terms of safety and warranty. With a bad inducer motor, your furnace may sound like a zoo.

Can You Bypass Inducer Motor On Furnace

Image of inducer motor in a furnace

Signs of a Bad Inducer Motor

To identify signs of a bad inducer motor, you need to check whether the draft inducer motor is working. Understanding the function of this part and the potential problems it can cause is crucial in troubleshooting furnace issues. 

In this section, we will introduce you to the draft inducer motor, which regulates air pressure in the furnace. We will then discuss the problems that can arise when the draft inducer motor malfunctions so that you can quickly diagnose and fix the issue.

Draft Inducer Motor: What it Is and What it Does

A draft inducer motor is a must-have component in your furnace. It is responsible for releasing dangerous gases from the home. It creates negative pressure inside the furnace, keeping you safe from carbon monoxide and other toxins. It also helps to keep combustion efficiency at its peak by controlling air intake.

Troubles with the draft inducer motor will cause issues with your heating system. This could be reduced airflow, strange noises or no heat at all. Warning signs include excessive vibration or shaking when running and sounds like rattling, grinding or clicking. If left unchecked, it could lead to complete motor failure, requiring costly repairs.

It’s essential to keep the motor well-maintained and serviced. This will help reduce energy usage while providing efficient heating for your home.

Many homeowners don’t pay attention to this part until they face winter weather problems with the heating system. To avoid future issues, get your HVAC system checked by a professional technician who knows how important regular maintenance is.

Remember that when it comes to draft inducer motors, problems are something you don’t want to catch.

Problems with Draft Inducer Motor

Draft inducer motors are key elements in heating systems. If they don’t work right, it can have a major impact on the furnace, reducing its effectiveness and even leading to harm. Signs of a poor inducer motor include strange noises, vibrations and no heat. 

Other signs might be tripped circuit breakers or it won’t start. If you spot any of these problems, get your draft inducer motor inspected by an expert.

If you don’t act fast, things can get worse. A broken motor can cause the furnace to overheat or get blocked with debris. That leads to further difficulties that are costly and hard to fix. Homeowners must address any problems with their draft inducer motors as soon as possible for their safety and to keep their heating system running well.

In some cases, a bad draft inducer motor has had tragic consequences. In 2017, an incorrectly installed draft inducer motor caused a carbon monoxide leak that killed two Massachusetts residents and hurt many others. This shows how important it is to take care of your heating system and deal with any issues without delay. By staying alert for warning signs and servicing your equipment regularly, you can avoid dangerous situations and save money from repairs in the future.

Checking Inducer Motor Assembly

To check the inducer motor assembly on your furnace, you need to use a multimeter to test motor resistance and inspect the motor bearings. Checking these aspects will give you a clearer idea of the issue with your furnace’s inducer motor, helping you determine if the motor is causing the problem

In this section, we’ll walk you through how to use a multimeter to check motor resistance and how to check motor bearings, two essential techniques for diagnosing inducer motor issues.

How to Use a Multimeter to Check Motor Resistance

The Inducer Motor Assembly is an important piece of HVAC systems. Inspect it regularly to keep your system running smoothly. Use a multimeter to measure the motor’s resistance. 

Here are 5 steps:

  1. Power off – Disconnect the power before testing.
  2. Set the multimeter – Set up the multimeter to measure resistance (ohms).
  3. Touch the probes – Place the leads on each terminal of the motor. Make sure to push the probes firmly onto metal surfaces, not insulating material.
  4. Note readings – Read and jot down the values.
  5. Compare readings – Compare the readings with the manufacturer’s specs. Typically, motors should have a range between 30-90 ohms.

Safety first. Be careful when dealing with electricals. Don’t touch live wires or terminals with bare hands.

Check your assembly if something is off, it can lead to higher electricity bills, quick damage to components, or worse. So, inspect it now and save yourself some trouble later.

How to Check Motor Bearings

Checking motor bearings is key to the longevity and efficiency of your inducer motor assembly

Here’s how to do it:

  1. Turn off the power – Always cut off all electrical power related to the motor before the inspection. This is a safety measure.
  2. Remove cover – Once power is disconnected, take the cover off.
  3. Look for debris – Check both ends of the motor shaft for debris or discoloration. These can signal wear or damage.
  4. Test bearing clearance – Move the shaft gently. If there are clearances, the bearings need tightening or replacing.
  5. Listen out – With the motor off but energized, listen for strange sounds.
  6. Grease/oil – If necessary, grease or oil the bearings as instructed.

Regular maintenance is vital for induction motors. Pay attention to any shifts in vibration patterns as they may indicate bearing failure.

My friend didn’t inspect her motor regularly. The result? An expensive repair after only two years of use due to misalignment between bearings and motor shafts. Don’t be complacent with your inspections, regular checks can save you time and money.

Reasons Why Inducer Motor Won’t Start

To troubleshoot the reason behind a faulty inducer motor not starting, understanding the common culprits is necessary. Three sub-sections that can clarify the issue are a faulty control board, a faulty pressure switch, and thermostat issues. Delving into each area can help you understand the root cause of the problem and enable you to fix it effectively, either on your own or with the help of a professional HVAC technician.

Can You Bypass Inducer Motor On Furnace

Faulty Control Board

A malfunctioning control board may be the cause of your inducer motor not starting. It could have faulty connections or a broken part stopping it from talking to other furnace components.

To fix the board, switch off the furnace power for a few minutes then turn it back on. If that doesn’t work, take a look at the board for any obvious signs of damage or loose connections. You must identify and replace any broken parts before restarting the furnace.

You may also want to consider hiring an HVAC technician. They can troubleshoot and make repairs that you may not be able to do. Plus, they can help keep your furnace running in good condition. Don’t risk more damage to your furnace, get professional help for complex repairs.

Faulty Pressure Switch

Got a “Faulty Pressure Switch”? Don’t let it leave you in the cold this winter season. Check the wiring for any loose or damaged connections. Make sure all hoses are connected and not clogged. Use a multimeter to test if the circuit is working properly. If you find any issues, replace it right away.

Ignore it and you may have to pay big bucks for repairs. So, keep your furnace’s pressure switch in top shape. Regular checks and maintenance will ensure it’s working safely and efficiently. 

Plus, you’ll probably save on energy bills and costly repairs in the long run. So don’t delay, get couples therapy with a professional technician if your thermostat’s playing the silent treatment!

Thermostat Issues

When the furnace inducer motor won’t start, it might be because of the thermostat. It’s the thermostat’s job to tell the furnace when to turn on and off. If the thermostat isn’t working right, it won’t give the furnace the message, which then stops the inducer motor.

To fix this, make sure your thermostat is set to “heat” and the temperature’s higher than the room. Also, check if any wires or connections from the thermostat to the furnace are loose. To be sure, get a professional technician to take a look.

Older thermostat models aren’t as good as modern “smart” ones. Consider getting a smart thermostat for better performance.

Pro Tip: Have a maintenance check-up with a professional once a year to keep your furnace running smoothly.

Can You Bypass the Pressure Switch for Troubleshooting?

To troubleshoot issues with your furnace’s pressure switch, you may be tempted to bypass it. However, this can be dangerous and may cause more problems down the line. Instead, there are specific steps you can take to properly solve pressure switch problems without resorting to bypassing it. 

In this section, we will explore why bypassing the pressure switch is never a good idea and then guide you on how to solve pressure switch problems in a safe and appropriate manner.

Why Bypassing Pressure Switch is Never a Good Idea

Bypassing a pressure switch may seem like an easy fix, but it’s not a good option. Cutting off the switch can create a safety hazard and damage the system. It’s a safety measure to control airflow and stop overheating or underperformance.

When the pressure switch overrides, something is wrong with the HVAC system. Bypassing it overlooks the problem and can lead to bad consequences. Plus, there’s the risk of fire or explosion if there’s no vent limit switch.

Instead of bypassing, hire an expert. They can identify any underlying problems and offer solutions. They can examine airflows, refrigerant levels, fans’ operation, and power supply.

Get routine maintenance checks bi-annually (or more often). This can prevent blowouts and keep the system running all year round. So, don’t attempt to bypass pressure switch problems, follow the steps and stay safe.

How to Solve Pressure Switch Problems in the Proper Way

Need help fixing your pressure switch issues? Take a look at this step-by-step guide!

  1. Turn off and disconnect your HVAC unit from its power source.
  2. Find the pressure switch and inspect it for any damage or debris.
  3. Check the contact points on the switch when running.
  4. If the switch is damaged or clogged, clean or replace as needed.
  5. Reconnect the HVAC unit to its power source and turn it on to see if the issue is solved.
  6. If not, consult a professional technician for further diagnosis and repair.

Remember that various factors can cause pressure switch issues. Clogged airflow or electrical problems may be the culprit.

For instance, one homeowner experienced their heating system turning on and off randomly. After consulting with an expert, it was the clogged air filter causing airflow issues. Replacing the filter fixed the system.

If your HVAC unit behaves oddly, don’t wait, seek professional help to prevent further damage.

Repairing Inducer Motor

To repair your furnace’s inducer motor, you need to know how to replace it and when to contact an HVAC technician for help. Whether you’re dealing with a bad inducer motor or an issue with the furnace control board, you may need to replace the motor to fix the problem

How to Replace Inducer Motor

Inducer motors are essential for HVAC systems! Replacing one can be tricky, but it can be done with the right steps. 

Here’s a 4-step guide to help you:

  1. Turn off power: Before starting, make sure the power is off to avoid accidents.
  2. Remove old motor: Detach the inducer assembly and loosen any clamps. Remove the old motor from the assembly.
  3. Install new motor: Place the new motor in the same position. Secure it with screws or bolts. Put back into the furnace.
  4. Reassemble and test: Reset all connections. Turn on and run a heating cycle for at least half an hour. Check the function and adjust if needed. Close access cover.

Remember that Each HVAC model may have different requirements. Consult your manufacturer or manual first.

Fun Fact: Did you know that the Induced Draft Fan is also known as ID Fan? It creates negative air pressure in facilities or industries, and the fan blades are axial, forward-curved, or backward-curved. This ensures minimal noise while spinning, keeping workers safe from hearing damage. Who needs an HVAC technician when you can just throw a snowball at your broken furnace and hope for the best?

Contacting HVAC Technician for Help

When your HVAC system’s inducer motor is not working, it’s essential to reach out to an expert technician. They possess the skill and knowledge to detect and repair the issue quickly. Trying to fix it on your own with no previous training can cause further destruction and expensive repairs.

The technician will go through a bunch of tests to find the root of the problem. This usually involves inspecting the clogged or dirty filters, blocked vents or flues, and defective sensors. Additionally, they will examine the wiring connections and replace any worn-out parts if necessary.

Bear in mind, the cost of repairs is based on the amount of damage done to the unit. Clarifying the repair or replacement costs before starting the repairs is important.

John recently experienced a strange noise from his furnace’s inducer motor. He wisely called a specialist who found that the bearings had an issue. The technician fixed the problem by replacing old parts at an affordable cost. Ignoring this sign could have caused more destruction to the system, leading to more costly replacements.

Doing DIY repairs may seem attractive, but it is best to leave complex HVAC maintenance tasks such as fixing an inducer motor to professionals. They provide efficient solutions at a reasonable price. If your inducer motor fails again, remind yourself, it’s them, not you.


Inducer motors on furnaces are vital. They help control the draft inducer. This preserves furnace efficiency and stops carbon monoxide from building up. If the inducer motor has problems, like bad bearings or a switch issue, you can bypass it, till a technician comes to check it. You can use a multimeter to measure resistance and carefully link wires. This may start the furnace without the inducer motor. Be careful though this is only a short-term fix. You must get an HVAC service professional for safety and long-term use.