--- title: Leister UNIROOF AT Warning and Error Messages description: Find the error codes and definitions for the Leister UNIROOF AT. Hy-Tech is an authorized Leister Sales and Service Center. --- Search our inventory of drains, drain parts, safety and roofing equipment, and accessories. [Shop Now](https://hy-techroof.com/products/). - [ About ](https://www.hy-techroof.com/about-hy-tech/) - [ Contact ](https://www.hy-techroof.com/contact-hy-tech/) - - [![Hy-Tech Roof Products](https://resources.hy-techroof.com/hubfs/Logos/Hy-Tech%20Logo_rgb_maroon_480.png) ](https://www.hy-techroof.com) [**](https://www.hy-techroof.com/login.php) [**](https://www.hy-techroof.com/cart.php) ** ** [![Hy-Tech Roof Products](https://resources.hy-techroof.com/hubfs/Logos/Hy-Tech%20Logo_rgb_maroon_480.png) ](https://www.hy-techroof.com) [**](https://www.hy-techroof.com/cart.php) - - # Leister UNIROOF AT Warning and Error Messages [Leister UNIROOF AT](https://hy-techroof.com/leister-uniroof-at) warning and error messages are displayed on a case-by-case basis in the **Status display (40) **or in the** Work display (41)**. ![UNIROOF_AT_Warnings_Error_Msgs_1](https://resources.hy-techroof.com/hs-fs/hubfs/UNIROOF_AT_Warnings_Error_Msgs_1.png?width=258&name=UNIROOF_AT_Warnings_Error_Msgs_1.png) **If there is a warning, you can still continue to work largely without restrictions.**** ** In contrast to the warning message, **it is not possible to continue working once an err****or message has appeared. **The heating is switched off automatically and the drive is blocked. The display of the corresponding error codes will appear in the **Work display (41). **![UNIROOF_AT_Warnings_Error_Msgs_2](https://resources.hy-techroof.com/hs-fs/hubfs/UNIROOF_AT_Warnings_Error_Msgs_2.png?width=194&name=UNIROOF_AT_Warnings_Error_Msgs_2.png) Concrete information regarding the type of error or the warning can be called up at any time, including via the Settings menu under Show Warnings. Following are the definitions of the different warning and error displays that may appear.  | **Message Type** | **Display** | **Error Code** | **Description and Measures** | | --- | --- | --- | --- | | Warning |  ![UNIROOF_AT_Warnings_1](https://resources.hy-techroof.com/hs-fs/hubfs/UNIROOF_AT_Warnings_1.png?width=96&name=UNIROOF_AT_Warnings_1.png)   | - | Example of the Warning symbol in the **Status display (33),** and the text that will appear in the work display after calling up the Show Warnings menu | | Error |  ![UNIROOF_AT_Warnings_0001](https://resources.hy-techroof.com/hs-fs/hubfs/UNIROOF_AT_Warnings_0001.png?width=96&name=UNIROOF_AT_Warnings_0001.png)   | 0001 | Error: Overtemperature Solution: Allow the device to cool down. | |  ![UNIROOF_AT_Warning_0020](https://resources.hy-techroof.com/hs-fs/hubfs/UNIROOF_AT_Warning_0020.png?width=96&name=UNIROOF_AT_Warning_0020.png)   | 0020 | Error: Heating element defective  Solution: Replace heating element. | | | Errors that require a Leister Service Center | ![UNIROOF_AT_Warning_0004](https://resources.hy-techroof.com/hs-fs/hubfs/UNIROOF_AT_Warning_0004.png?width=96&name=UNIROOF_AT_Warning_0004.png)  | 0002 | Undervoltage/overvoltage | | 0004 | Hardware error | | | | 0008 | Thermocouple is defective | | | | 0100 | Blower is faulty | | | | 0200 | Communication module error | | | | 0400 | Drive error | | | If you are still experiencing issues with your UNIROOF AT Warning and Error messages, contact your [Hy-Tech Product Service Center](https://resources.hy-techroof.com/hy-tech-products-service-centers), an authorized Leister Service Center.     - [Drains](https://www.hy-techroof.com/products/drains/) - [Zurn](https://www.hy-techroof.com/manufacturers/zurn/) - [Smith](https://www.hy-techroof.com/manufacturers/j-r-smith/) - [Josam](https://www.hy-techroof.com/manufacturers/josam/) - [Wade](https://www.hy-techroof.com/manufacturers/wade/) - [Marathon](https://www.hy-techroof.com/manufacturers/marathon/) - [Olympic](https://www.hy-techroof.com/manufacturers/olympic/) - [Equipment](https://www.hy-techroof.com/products/equipment) - [Garlock](https://www.hy-techroof.com/manufacturers/garlock/) - [Leister](https://www.hy-techroof.com/manufacturers/leister/) - [All Seasons / Grizzly](https://www.hy-techroof.com/manufacturers/all-seasons-equipment/) - [Hennes-Johnson](https://www.hy-techroof.com/manufacturers/hennes-johnson/) - [Gator](https://www.hy-techroof.com/manufacturers/gator-roofing-equipment/) - [Roofmaster](https://www.hy-techroof.com/manufacturers/roofmaster-products-company/) - [Safety](https://www.hy-techroof.com/products/safety) - [Leading Edge](https://www.hy-techroof.com/manufacturers/leading-edge-safety/) - [Tie Down Manufacturing Ingenuity](https://www.hy-techroof.com/manufacturers/tie-down-manufacturing-ingenuity/) - [Malta Dynamics](https://www.hy-techroof.com/manufacturers/malta-dynamics/) - [Resources](https://resources.hy-techroof.com) - [Account](https://www.hy-techroof.com/login.php) - [The Drain Wizard](https://resources.hy-techroof.com/ask-the-drain-wizard) - [FAQ](https://resources.hy-techroof.com/faq) - [Blog](https://resources.hy-techroof.com/blog) - [Roof Drain Specs](https://resources.hy-techroof.com/roof-drain-specs-and-diagrams) - [Video Library](https://resources.hy-techroof.com/video-library) - [About](https://www.hy-techroof.com/about-hy-tech/) - [Contact Us](https://www.hy-techroof.com/contact-hy-tech/) - [About Hy-Tech](https://www.hy-techroof.com/about-hy-tech/) - [Service and Repairs](https://www.hy-techroof.com/service-and-repairs/) [800-635-0384](tel:8006350384) **Hy-Tech Products **10035 Broadview Road, Broadview Heights, OH 44147 [info@hy-techroof.com](mailto:info@hy-techroof.com) [800-635-0384](tel:8006350384) **Hy-Tech Products **10035 Broadview Road, Broadview Heights, OH 44147 [info@hy-techroof.com](mailto:info@hy-techroof.com) © 2026 Hy-Tech Products, Inc. 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