--- title: Troubleshoot a Card Reader description: Follow these steps to reconnect or otherwise troubleshoot a malfunctioning card reader. --- [Skip to content](https://support.getunion.com/knowledge/troubleshoot-a-card-reader#main-content) English Show submenu for translations [Still need help?](https://support.getunion.com/knowledge/kb-tickets/new?hsLang=en) [Customer portal](https://support.getunion.com/getting-started?hsLang=en) ![union app icon.png\]](https://support.getunion.com/hs-fs/hubfs/union%20app%20icon.png?height=40&name=union%20app%20icon.png) - [Default HubSpot Blog](https://9012127.hs-sites.com/blog) Open main navigation Close main navigation - [Default HubSpot Blog](https://9012127.hs-sites.com/blog) - English Show submenu for translations - [Still need help?](https://support.getunion.com/knowledge/kb-tickets/new) - [Customer portal](https://support.getunion.com/getting-started) Always ready to support you - There are no suggestions because the search field is empty. 1. [Union Support](https://support.getunion.com/knowledge?hsLang=en) 2. [Hardware](https://support.getunion.com/knowledge/hardware?hsLang=en) 3. [Card Readers](https://support.getunion.com/knowledge/hardware?hsLang=en#card-readers) # Troubleshoot a Card Reader ## Follow these steps to reconnect or otherwise troubleshoot a malfunctioning card reader. First, determine which card reader you have from the pictures below. - If **eDynamo**, continue to the**[Troubleshoot an eDynamo Card Reader](https://support.getunion.com/knowledge/troubleshoot-a-card-reader#eDynamo)** section. ![eDynamo](https://support.getunion.com/hs-fs/hubfs/image-png-Jan-23-2024-05-49-00-4159-AM.png?width=179&height=136&name=image-png-Jan-23-2024-05-49-00-4159-AM.png) - If **iDynamo6**, continue to the **[Troubleshoot an iDynamo6 Card Reader](https://support.getunion.com/knowledge/troubleshoot-a-card-reader#iDynamo6)** section. ![iDynamo6](https://support.getunion.com/hs-fs/hubfs/image-png-Jan-23-2024-05-50-49-8626-AM.png?width=181&height=134&name=image-png-Jan-23-2024-05-50-49-8626-AM.png) ### Troubleshoot an eDynamo Card Reader 1. Check the indicator light on the card reader.  ![](https://support.getunion.com/hs-fs/hubfs/image-png-Jan-23-2024-07-56-56-2946-AM.png?width=174&height=128&name=image-png-Jan-23-2024-07-56-56-2946-AM.png) - If **the color is green** (solid or blinking): Continue to Step 2. - If **the color is anything else**: Stop troubleshooting and contact Support. - If **the light is out**: Stop troubleshooting and contact Support. 1. On your POS terminal, close the Union POS application and open iPad Settings. 2. From the left menu, select “Bluetooth”. 3. Write down the card reader's serial number (e.g., **eDynamo-######**) as displayed on the Bluetooth screen. ***\> Note:** You will need this information later.* 4. Scroll down the left menu and select “Union”. 5. On the Union screen, verify that “Card Reader Model (iPad only)” has the “eDynamo” option selected. 6. Verify that the toggle switch next to “Enable Card Reader Pairing (eDynamo)” is switched on and colored green. 7. Hold down the small button on the left hand side of eDynamo until light flashes blue to enable pairing. 8. Close iPad Settings and reopen the Union POS app. ***⇒ Result:** When reopening the Union POS app, a popup will display.* 9. Select the card reader by its serial number, noted in Step 2. 10. At the prompt, swipe a test card to complete the pairing process. - If **the pairing is successful**: A “Pairing was successful” message will display. - If **the pairing was not successful**: Stop troubleshooting and contact Support. --- ### Troubleshoot an iDynamo Card Reader 1. Check the indicator light on the card reader. ![](https://support.getunion.com/hs-fs/hubfs/image-png-Mar-30-2024-02-22-06-1839-AM.png?width=223&height=150&name=image-png-Mar-30-2024-02-22-06-1839-AM.png) - If the **color is green** (solid or blinking): Continue to Step 2. - If the **color is anything else**: Stop troubleshooting and contact Support. - If the **light is out**: Stop troubleshooting and contact Support. 2. On your POS terminal, close the Union POS app. 3. Open iPad Settings. 4. Scroll down the left menu and select "Union" 5. On the Union screen, verify that “Card Reader Model” has the “iDynamo” option selected. 6. From the left menu, select “General”. 7. Scroll down the page on the right to select "Shut Down". 8. With the iPad powered off, unplug its power source from either the back of the iPad or the power outlet. 9. Wait for the iPad to completely shut down. 10. Plug the power source back in. ***⇒ Note:** Plugging the power source back in should automatically turn on the iPad terminal.* - [Portal](https://support.getunion.com/knowledge/portal?hsLang=en#main-content) - [Menu](https://support.getunion.com/knowledge/portal?hsLang=en#menu) - [Reports](https://support.getunion.com/knowledge/portal?hsLang=en#reports) - [Permissions](https://support.getunion.com/knowledge/portal?hsLang=en#permissions) - [Hardware](https://support.getunion.com/knowledge/hardware?hsLang=en#main-content) - [Printer](https://support.getunion.com/knowledge/hardware?hsLang=en#printer) - [Terminal](https://support.getunion.com/knowledge/hardware?hsLang=en#terminal) - [Card Readers](https://support.getunion.com/knowledge/hardware?hsLang=en#card-readers) - [Hardware Process](https://support.getunion.com/knowledge/hardware?hsLang=en#hardware-process) - [Network](https://support.getunion.com/knowledge/hardware?hsLang=en#network) - [POS](https://support.getunion.com/knowledge/pos?hsLang=en#main-content) - [Offline Mode](https://support.getunion.com/knowledge/pos?hsLang=en#offline-mode) - [Permissions](https://support.getunion.com/knowledge/pos?hsLang=en#permissions) - [Tab Management](https://support.getunion.com/knowledge/pos?hsLang=en#tab-management) - [Process](https://support.getunion.com/knowledge/pos?hsLang=en#process) - [Integration](https://support.getunion.com/knowledge/integration?hsLang=en#main-content) - [Partners](https://support.getunion.com/knowledge/integration?hsLang=en#partners) - [Network](https://support.getunion.com/knowledge/network?hsLang=en) - [Process](https://support.getunion.com/knowledge/process?hsLang=en#main-content) - [Processing](https://support.getunion.com/knowledge/process?hsLang=en#processing) - [Support](https://support.getunion.com/knowledge/support?hsLang=en#main-content) - [Menu](https://support.getunion.com/knowledge/support?hsLang=en#menu) - [POS](https://support.getunion.com/knowledge/support?hsLang=en#pos) - [Processing](https://support.getunion.com/knowledge/support?hsLang=en#processing) - [Reports/Reporting](https://support.getunion.com/knowledge/support?hsLang=en#reports-reporting) - [parts.getunion.com](https://support.getunion.com/knowledge/parts-getunion-com?hsLang=en) - [Payment Processing](https://support.getunion.com/knowledge/payment-processing?hsLang=en) - [Default HubSpot Blog](https://9012127.hs-sites.com/blog) [![Chill listening crop-3](https://support.getunion.com/hs-fs/hubfs/Union%20Logo.png?width=72&height=24&name=Union%20Logo.png "Chill listening crop-3")](https://getunion.com/) Copyright © 2026, Union