--- title: Intelli-Hood 3 Faults description: Is an Intelli-Hood 3 (IH3) system installed in your commercial kitchen? Learn how to diagnose and resolve common IH3 system faults. image: https://blog.melinkcorp.com/hubfs/Blog%203%20IH3.png --- - [Services](https://melinkcorp.com/services/) - - - [Services Overview](https://melinkcorp.com/services/) - [Building Commissioning](https://melinkcorp.com/services/building-commissioning/) - [Test, Adjust & Balance](https://melinkcorp.com/services/test-adjust-and-balance/) - [Test, Adjust & Balance FAQs](https://melinkcorp.com/services/test-adjust-balance-faqs/) - - #### Why we do what we do “We’ll build a 7 figure new store and we’ll fight with the A/C or negative air pressure for months or years, all because the equipment was never set up properly, causing problems that extend for the life of the building. Your reports allow us to know everything is set the way it should be from the beginning.” *Director of Facilities for a national restaurant chain* - [Kitchen Hood Controls](https://melinkcorp.com/kitchen-hood-controls/) - - - [Intelli-Hood Overview](https://melinkcorp.com/kitchen-hood-controls/) - [Intelli-Hood FAQs](https://melinkcorp.com/kitchen-hood-controls/intelli-hood-faqs/) - [Intelli-Hood Resources](https://melinkcorp.com/kitchen-hood-controls/intelli-hood-resources/) - - #### Why we do what we do > “Our engineering department worked with the engineers from each of our hotel brands and fully evaluated Intelli-Hood. Everyone is convinced that this is one of our most cost-effective paths to sustainability.” > > *SVP Operations New Development at Leading Global Hotel Chain* [tel:15139657300](tel:15139657300) - [Services](https://melinkcorp.com/services/) - [Building Commissioning](https://melinkcorp.com/services/building-commissioning/) - [Test, Adjust & Balance](https://melinkcorp.com/services/test-adjust-and-balance/) - [Test, Adjust & Balance FAQs](https://melinkcorp.com/services/test-adjust-balance-faqs/) - [Kitchen Hood Controls](https://melinkcorp.com/kitchen-hood-controls/) - [Intelli-Hood Resources](https://melinkcorp.com/kitchen-hood-controls/intelli-hood-resources/) - [Intelli-Hood FAQs](https://melinkcorp.com/kitchen-hood-controls/intelli-hood-faqs/) [About](https://melinkcorp.com/about/) - [Green Buildings](https://melinkcorp.com/about/melink-green-buildings/) - [Careers](https://melinkcorp.com/about/careers/) - [Contact](https://melinkcorp.com/contact/) # Green Link Sharing our expertise to help you succeed ![](https://blog.melinkcorp.com/hubfs/big-Krista%20Rose.jpg) [Krista Rose](https://blog.melinkcorp.com/blog/author/krose) 2/17/20 8:00 AM [DCKV](https://blog.melinkcorp.com/blog/topic/dckv) - [Tweet](https://twitter.com/share) Is an Intelli-Hood 3 (IH3) system installed in your commercial kitchen? In this post, we will cover common IH3 system faults. #### **Clearing IH3 Optic Faults** [Optics need to be cleaned periodically](https://melinkcorp.com/blog/intelli-hood-cleaning). Melink recommends cleaning your Intelli-Hood 3 optic sensors a few times each month. If there is a large amount of buildup on the lens or a simple obstruction in the hood, the touchpad will show an optic fault.  - The [touchpad](https://melinkcorp.com/blog/intelli-hood-touchpad-operation) will show which hood has the optic fault. - Verify there are no obstructions in the hoods. - Verify that the optics are aligned. You can do this by navigating to “Status” under the Menu, then “Hood Controllers.” Select the appropriate hood controller using the “Next” button, and you’ll be able to check the voltage displayed as actual signal versus calibrated signal (ex. 1.32v/1.67v). - If the touchpad displays “Calibrating” or a low signal (0.02v/1.84v), the hardware is working properly but may have an obstruction causing the signal to be too low. - Many optic faults can be prevented through routine hood cleaning and system maintenance. - Verify that the [cables are also connected](https://melinkcorp.com/blog/intelli-hood-wiring) tight on the hood controller. If your fault says “Emitter Missing” or “Receiver Missing,” it is indicating a possible bad connection or failed component. Check the connector at each optic sensor for a loose plug or, less commonly, corrosion on the terminals.   #### **Clearing IH3 Temperature Faults** Temperature sensors installed in the hood monitor the temperature of the exhaust air.  The Intelli-Hood 3 system can be programmed to turn on and off automatically by hood temperature.  Signs of a temperature fault include fans running at 100% and the touchpad stating that a “Temp Fault” is occurring. Therefore, it is important to understand that a temperature fault could turn your system on or off at inappropriate times. In most cases, the fault will simply cause the fan to run 100%, which will allow cooking to continue but prevents you from saving energy. If you experience an Intelli-Hood 3 temp fault… - Make sure that the sensors are clean. It is not always necessary to clean the temperature sensor unless there is a large amounts of grease or build up. - Check the connections that go from the temperature probe to the controllers. Also, verify that the number of temp sensors match the number of temp sensors programmed. Under the Menu, select “Status (1)” followed by “Hood Controllers (3).” Then select “Enter.” If a temperature sensor is not connected properly or isn’t working, then it will show as “Missing.” - Check for any damaged components. - On the hood controller, there are different ports that can be used to connect the cables for temperature sensors. Swapping those may help to get rid of the fault.   If your Intelli-Hood 3 system is still experiencing issues, we encourage you to check our other [reference documents](https://melinkcorp.com/intellihood/intelli-hood-resources).   Access Intelli-Hood [reference materials](https://melinkcorp.com/intellihood/intelli-hood-resources), [FAQs](https://melinkcorp.com/faqs), and [how-to videos](https://www.youtube.com/playlist?list=PLh0dcw1wLBW47-gQwbvwA3T_PUXQL4czs). For advanced troubleshooting, contact Melink Technical Support (available 24 hours a day, 7 days a week) via [web request](https://melinkcorp.com/intellihood/intelli-hood-resources) or by calling 877-477-4190. ![Krista Rose](https://blog.melinkcorp.com/hubfs/big-Krista%20Rose.jpg) #### About [Krista Rose](https://blog.melinkcorp.com/blog/author/krose) As Melink's Marketing Communications Specialist, Krista Rose works to build brand awareness and share Melink's mission. ## Most Popular Blog Posts ### Recent Posts ### VIEW BLOG POSTS BY TOPIC - [HVAC Test & Balance (50)](https://blog.melinkcorp.com/blog/tag/hvac-test-balance) - [DCKV (49)](https://blog.melinkcorp.com/blog/tag/dckv) - [Employee Owned (35)](https://blog.melinkcorp.com/blog/tag/employee-owned) - [Energy Efficiency (27)](https://blog.melinkcorp.com/blog/tag/energy-efficiency) - [Building Health (21)](https://blog.melinkcorp.com/blog/tag/building-health) - [Climate Change (13)](https://blog.melinkcorp.com/blog/tag/climate-change) - [Construction (10)](https://blog.melinkcorp.com/blog/tag/construction) - [Commissioning (8)](https://blog.melinkcorp.com/blog/tag/commissioning) - [Green (8)](https://blog.melinkcorp.com/blog/tag/green) - [Renewable Energy (6)](https://blog.melinkcorp.com/blog/tag/renewable-energy) - [Corp (5)](https://blog.melinkcorp.com/blog/tag/corp) - [Zero-Energy Building (5)](https://blog.melinkcorp.com/blog/tag/zero-energy-building) - [Electric Vehicle (4)](https://blog.melinkcorp.com/blog/tag/electric-vehicle) - [Solar PV (3)](https://blog.melinkcorp.com/blog/tag/solar-pv) - [HQ2 (2)](https://blog.melinkcorp.com/blog/tag/hq2) - [Geothermal (1)](https://blog.melinkcorp.com/blog/tag/geothermal) See all ## Most Recent Blog Posts ### Recent Posts ### Subscribe to Email Updates ## CONTACT US **Global Headquarters:** Melink Campus 5140 River Valley Road Milford, OH 45150 USA 513-965-7300 © Copyright 2025, Melink Corporation. All Rights Reserved. - [About Us](https://melinkcorp.com/about/) - [Privacy Policy](https://melinkcorp.com/privacy-policy/) - [Terms & Conditions](https://melinkcorp.com/terms-conditions/) [LinkedIn (opens in new window)](https://www.linkedin.com/company/melink-corporation) [YouTube (opens in new window)](https://www.youtube.com/channel/UCsa6oLcgZPSwAY4R1_NurRA) [Twitter (opens in new window)](https://twitter.com/MelinkCorp) [Facebook (opens in new window)](https://www.facebook.com/MelinkCorp)