--- title: "Intelli-Hood 2 Fault Codes: “My System Fault Is Not in the Manual.”" description: Having trouble interpreting Intelli-Hood 2 fault codes? Learn about specific fault codes for the Melink IH2 system and how to diagnose. image: https://blog.melinkcorp.com/hubfs/Blog%203%20IH2.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) In this post, we will dive into specific fault codes for the Melink Intelli-Hood 2 (IH2) system… Over the years, Melink Corp has designed and implemented three Intelli-Hood® systems: IH1, IH2 and IH3. Each system has its own specific configurations. While all work on the same basic principles, they DO NOT have the same parts or interfaces. Not sure what system is in your kitchen? [Click here](https://melinkcorp.com/blog/how-to-identify-intelli-hood-systems).   #### Intelli-Hood 2 Faults The IH2 reference guide does not list every possible fault. Instead, it includes a code guide, which can be confusing to interpret, especially if the system has multiple hoods. Please note that everyday kitchen staff should not be expected to understand these faults; the intention is for a contractor or electrician to be handling fault issues.   #### **Intelli-Hood 2 Fault Code Guide** This code guide should be used for diagnosing IH2 fault codes: **F =** Fault **1, 2, 3 or 4 =** Identifies the hood number, i.e. H-2 means Hood 2 **h-1-e = **100% **H or h = **Temperature fault **H = **Sensor fault code relating to high temperature or open circuit/high resistance **h=** Sensor fault code relating to low temperature or low resistance **U =** VFD fault *Note:* *U faults will normally be followed by another code. If you don’t have a second code, the system is not recognizing the VFD, i.e. no power is going to it.* **O = **Optic fault **o on bottom of display =** Low optic signal **o on top of display = **High optic signal or saturation **F-PH =** Phone line *Note: Either the phone line connected to it is no longer there or the modem itself is bad.*   #### More Information Read the following for more information about fault codes: [Temperature and Optic Sensor Faults](https://melinkcorp.com/blog/intelli-hood-fault-codes-optic-temperature-faults) [VFD Faults](https://melinkcorp.com/blog/intelli-hood-vfd) For full code troubleshooting details, consult your [IH2 troubleshooting guide](https://melinkcorp.com/docs/resources/Intelli-Hood-2-Troubleshooting-Guide.pdf).   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)