Kyocera Error F24B — What It Means & How to Fix It
By Ryan Green · Updated August 2026 · Independent guide · PrinterCare USA LLC (not affiliated with any printer manufacturer)
The F24B error code on Kyocera multifunction printers signals that the main controller board has detected an internal communication or processing fault. This error is frustrating because your machine may appear to power on normally, yet refuse to print, copy, or scan until the issue is resolved. Unlike paper jams or toner warnings, controller errors require either a targeted reset procedure or firmware intervention, and the steps differ based on your specific Kyocera model.
You are not alone in experiencing this issue. Many businesses and home offices encounter F24B errors after unexpected power losses, failed firmware updates, or prolonged operation in dusty environments. The good news is that most F24B errors can be cleared without replacing expensive components, and this guide will walk you through the exact steps that our technicians use in the field.
How to fix it — step by step
- Perform a Complete Power Cycle. Unplug the printer from the electrical outlet and wait for exactly two minutes before reconnecting it. This allows the controller's volatile memory to fully discharge and clears temporary faults that sometimes trigger false error codes. After plugging the unit back in, allow it to boot completely, which typically takes sixty to ninety seconds, before attempting any operations.
- Check All Internal Connections. Open the printer's front access panel and visually inspect the ribbon cables connecting the main controller board to the imaging unit, fuser assembly, and scanner module. Look for any cables that are loose, crimped, or partially disconnected. Gently reseat each cable by firmly pressing it into its connector until you hear or feel a click, then close the panel and power the device back on.
- Clear the Printer's Error Log. Navigate to the printer's menu using the front touchscreen or control panel and look for settings related to System or Maintenance. In this section, you should find an option to Clear Error Log or Reset Error Memory. Select this option and confirm the action. This step removes cached fault codes and allows the printer to perform fresh diagnostics on its next boot cycle.
- Access the Service Menu for Controller Reset. Locate the menu button on your printer's control panel and press it repeatedly until you reach a screen labeled Service Mode or Engineering Mode. You may need to enter a technician code, which is typically 1 1 7 for most Kyocera desktop models, though some require the machine serial number. Once inside, navigate to Controller Reset or System Reset and follow the on-screen prompts to reinitialize the main controller board.
- Perform a Firmware Refresh Without Full Update. If the controller reset alone does not clear the F24B error, you may need to reflash the printer's firmware. From the Service Menu, locate the Firmware or System Software option and select Verify Firmware Integrity or Refresh Firmware. The printer will compare its current firmware files against its backup and repair any corrupted sections without requiring a full reinstall or an external USB drive.
- Test Printer Functions Systematically. Once the error clears, test each major function one at a time: send a test print job from your computer, attempt a color and black-and-white copy using the copier glass, and run a scan to your email or USB drive. This systematic approach helps you confirm that the controller has fully recovered and that all interconnected subsystems are communicating properly.
- Update Network and USB Drivers on Your Computer. Sometimes the F24B error is triggered by communication failures between the printer and the connected computer rather than internal controller faults. Download the latest printer drivers for Windows 11 or macOS from the Kyocera support website, uninstall your current drivers completely, and install the new version. Restart your computer after installation to ensure all driver files are properly loaded.
- Contact Remote Support for Persistent Issues. If the F24B error returns after you have completed all reset procedures, the controller board itself may have a hardware fault. Many qualified repair technicians now offer remote diagnostic services for forty-nine dollars, during which they can access your printer's logs and run additional tests via network connection. This remote option often identifies whether you need an on-site visit or a controller board replacement.
Still stuck? A technician can fix it remotely today.
Independent remote support — you watch every step, and you pay the flat $49 only after your printer is working. $0 if we can't fix it.
Frequently asked questions
Does the F24B error mean my controller board is permanently broken?
Not necessarily. While F24B does indicate a controller fault, the majority of cases are caused by corrupted firmware, loose internal cables, or temporary communication errors that respond to resets. Only if the error persists after a complete power cycle, cable inspection, and service menu reset should you consider that the board itself may require replacement.
Can I still print or copy if the F24B error is showing?
In most cases, no. The F24B error locks the printer's main operations as a safety measure because the controller cannot verify that all subsystems are functioning safely. Attempting to force a print job when this error is active may result in poor output quality or further controller confusion. Clear the error first using the methods in this guide before resuming normal operations.
What should I do if the F24B error appears immediately after I update the firmware?
A failed or interrupted firmware update is a common cause of controller errors. Unplug the printer immediately and wait two minutes, then plug it back in to allow it to attempt an automatic recovery. If this does not work, access the Service Menu and select Recover Firmware or Restore from Backup. If your printer offers a rollback option, use it to return to the previous known-good firmware version.
Is the F24B error related to paper jams or low toner?
No, the F24B error is entirely separate from consumables and physical obstructions. If you are seeing F24B on the display, it is a controller or firmware issue, not a maintenance issue. However, you should still clear any paper jams or replace empty toner cartridges while you are troubleshooting, since these may prevent proper testing of your print functions after the F24B is resolved.