A technician inspects components of a commercial exhaust system.

Exhaust Hood Not Working? Here’s What To Do Next

Troubleshoot and fix non-functioning exhaust hood systems with simple checks before reaching out to certified experts from NAKS, Inc.


In a bustling commercial kitchen, the exhaust hood system plays a critical role in maintaining a safe and clean environment. However, unexpected issues can arise, leading to a non-functioning exhaust hood just when you need it the most. A malfunctioning hood system can disrupt your kitchen’s smooth operation and pose risks to staff and customers alike. In this comprehensive guide, we’ll explore simple steps to troubleshoot common problems and ensure your exhaust hood is up and running efficiently. For expert solutions, trust NAKS, Inc., renowned for offering top-quality exhaust hood systems and accessories tailored to meet your kitchen’s needs.

Steps to Troubleshoot Your Commercial Exhaust Hood System

  • Check the On/Off Switch:

The first step in troubleshooting your exhaust hood system is to verify the on/off switch. Sometimes during routine cleaning or kitchen activities, the switch might have been accidentally turned off. Ensure that the switch is in the correct position, allowing the hood system to function properly. This is the easiest fix on our list and we hope it works, but if not, don’t despair – keep reading for more tips!

  • Verify the Circuit Breaker:

If the on/off switch is set to the correct position and the hood is still not working, the next step is to inspect the circuit breaker box. The circuit breaker protects electrical circuits from overload and short circuits. A tripped breaker can cause the hood system to stop working. Locate the circuit breaker box, typically found in the kitchen area or another part of the building, and check that all switches are properly turned on.

  • Examine Fan Belts:

If the circuit breaker is not the issue, it’s time to look at the mechanical aspects of the hood system. Begin by inspecting the fan belts. Fan belts are critical components that transfer power from the motor to the exhaust fan, allowing it to function effectively. Fan belts are often located on the roof of the restaurant, outside of the hood system itself. Check to see if the fan belts are seated correctly and turning properly. Misaligned belts can prevent the system from starting, resulting in a non-functioning exhaust hood.

  • Roof Service Switch:

While up on the roof checking the fan belts, keep an eye out for a roof service switch, if your restaurant has one. This switch is designed to turn off the hood systems temporarily, and it’s essential to ensure that it is turned on during normal kitchen operations. If this switch is turned off, it can deactivate the exhaust hood system, leading to its non-functionality.

  • Clean Grease Filters:

Another potential cause of a non-functioning exhaust hood is clogged grease filters. Grease filters are essential components that capture and remove grease-laden vapors from the air, preventing grease buildup in the ducts and potential fire hazards. Over time, these filters can become clogged with grease and debris, reducing the system’s efficiency. Check the hood’s grease filters to see if there are any blockages. If clogged, clean or replace the filters to restore the proper airflow and ensure the hood system’s optimal functionality.

When to Seek Professional Help for Your Commerical Exhaust System

After performing the simple checks mentioned above, if your exhaust hood system is still not working, it’s time to call in the experts. Diagnosing and repairing complex issues with the exhaust hood requires specialized knowledge and expertise. Rely on certified and licensed exhaust hood repair or cleaning companies to ensure the correct handling of any repairs or maintenance.


A non-functioning exhaust hood system can disrupt the smooth operation of your commercial kitchen, causing inconveniences and potential safety hazards. By following the simple troubleshooting steps mentioned above, you can identify and fix common issues, restoring your exhaust hood’s functionality. However, for complex problems, always rely on certified experts to ensure proper diagnosis and repair.

As your trusted partner, NAKS, Inc. offers top-quality exhaust hood systems and accessories, delivering efficient solutions to keep your kitchen running smoothly. For any inquiries about exhaust hood purchases or related services, reach out to our experts via phone at 1.800.854.3267 or through our live chat system. Ensure a clean, safe, and efficient kitchen environment with NAKS, Inc.’s dependable solutions.