Why the Draft Inducer Fan Keeps Cycling?

A draft inducer fan is an important component of a gas furnace that helps to ventilate the unit and provide proper airflow. However, it is not uncommon for the draft inducer fan to experience problems, such as constantly cycling on and off.

This can be a frustrating issue for homeowners as it can affect the furnace’s efficiency and potentially cause safety concerns. It is important to understand the possible causes of this issue and take steps to troubleshoot and fix it in order to ensure the proper functioning of the furnace.

Draft Inducer Fan Keeps Cycling

It is recommended to check the voltage being supplied to the inducer motor and verify that it is coming from the control board.

If the parts on the control board are accessible, you can look for a relay that may be turning on and off. It is also a good idea to check the thermostat and its wiring to rule that out as a possible cause.

If the issue is not with the thermostat or control board, it could be a problem with the inducer motor itself or possibly the draft hood. It may be necessary to consult a professional to properly diagnose and fix the issue.

Possible Causes of the Issue

There are several possible causes for a draft inducer fan cycling on and off constantly.

Malfunction in the Control Board

One possible cause is a malfunction in the control board. The control board is responsible for controlling the various functions of the furnace, including the draft inducer fan.

If there is a problem with the control board, it can cause the draft inducer fan to turn on and off unexpectedly.

Issue With the Thermostat Wiring

Another possible cause is an issue with the thermostat wiring. If the thermostat wiring is damaged or not properly connected, it can cause the draft inducer fan to turn on and off improperly.

A problem with the inducer motor itself could also be the cause of the issue. The inducer motor is responsible for turning the draft inducer fan, and if it is not functioning properly, it can cause the fan to turn on and off constantly.

Issue With the Draft Hood

Finally, there could be an issue with the draft hood, which is the opening at the base of the furnace that allows the draft inducer fan to ventilate the unit. If the draft hood is blocked or damaged, it can affect the proper functioning of the draft inducer fan.

Steps to Troubleshoot the Issue

To troubleshoot the issue of a draft inducer fan cycling on and off constantly, there are a few steps that can be taken.

• First, it is recommended to check the voltage being supplied to the inducer motor. This can be done using a voltage meter to ensure that the proper voltage is being supplied to the motor.
• Next, you can inspect the control board and look for any faulty relays. The control board is responsible for controlling the various functions of the furnace, including the draft inducer fan. If there is a problem with the control board or any of its relays, it can cause the draft inducer fan to turn on and off unexpectedly.
• It is also a good idea to check the thermostat and its wiring. If the thermostat wiring is damaged or not properly connected, it can cause the draft inducer fan to turn on and off improperly.
• In addition, you can test the inducer motor for proper function. The inducer motor is responsible for turning the draft inducer fan, and if it is not functioning properly, it can cause the fan to turn on and off constantly.
• Finally, you should check the draft hood for any blockages or damage. The draft hood is the opening at the base of the furnace that allows the draft inducer fan to ventilate the unit. If the draft hood is blocked or damaged, it can affect the proper functioning of the draft inducer fan.

How to Fix Draft Inducer Fan Keeps Cycling?

Here are a few additional tips that may be helpful if you are experiencing an issue with your draft inducer fan cycling on and off constantly:

Check for Debris or Blockages in the Furnace

If the draft inducer fan is experiencing issues, it is possible that debris or blockages in the furnace could be causing the problem. Check the inside of the furnace for any debris or blockages that may be affecting the airflow.

Check the Furnace Filter

A dirty or clogged furnace filter can restrict airflow and cause the draft inducer fan to work harder, potentially leading to problems. Make sure to check the furnace filter regularly and replace it if necessary.

Check the Air Ducts

If the air ducts in your home are damaged or blocked, it can affect the proper functioning of the draft inducer fan. Make sure to check the air ducts for any visible damage or blockages that may be causing problems.

Check for Drafts

If your home is experiencing drafts, it can affect the performance of the draft inducer fan. Make sure to check for drafts around windows and doors, and take steps to seal any gaps or cracks to improve the efficiency of your furnace.

Check the Furnace Age

If your furnace is older, it may be more prone to experiencing issues with the draft inducer fan. Consider replacing an older furnace with a newer, more efficient model to improve performance and reduce the risk of issues.

When to Call a Professional

If you are experiencing an issue with your draft inducer fan cycling on and off constantly, it is important to address the problem as soon as possible to ensure the proper functioning of your furnace. However, there are certain circumstances in which it may be necessary to call a professional for assistance.

If you are unable to resolve the issue through the above troubleshooting steps, it may be necessary to call a professional for further assistance. A trained technician will have the knowledge and expertise to properly diagnose and fix the issue.

If the problem persists after attempting the above troubleshooting steps, it is a good idea to call a professional for help. Continuing to use a furnace with a malfunctioning draft inducer fan can cause further issues and potentially be a safety hazard.

Finally, if you are not comfortable attempting the troubleshooting steps yourself, it is recommended to call a professional for assistance. While it is important to take an active role in maintaining your furnace, it is also important to prioritize your own safety and well-being. A trained technician will have the necessary knowledge, tools, and equipment to safely and effectively diagnose and fix the issue.

Conclusion

In conclusion, a constantly cycling draft inducer fan can be a frustrating and potentially hazardous issue for homeowners. It is important to understand the possible causes of this issue, such as a malfunctioning control board, thermostat wiring issue, problem with the inducer motor, or issue with the draft hood.

By following the steps to troubleshoot the issue, such as checking the voltage being supplied to the inducer motor, inspecting the control board, checking the thermostat and its wiring, testing the inducer motor, and checking the draft hood, you can often resolve the issue and ensure the proper functioning of your furnace.

However, if the issue persists or you are not comfortable attempting the troubleshooting yourself, it is recommended to call a professional for assistance. Properly functioning furnace components are essential for the safety and efficiency of your home heating system.