1. Overview
This instruction manual provides essential information for the proper installation, operation, and maintenance of your Mighty Mule R4211 Replacement Control Board. This board is designed to replace existing control boards in compatible Mighty Mule and GTO automatic gate openers, ensuring continued reliable performance.
2. Compatibility
The R4211 control board is specifically designed for compatibility with the following Mighty Mule and GTO automatic gate opener models:
- Mighty Mule FM500/502
- Mighty Mule MM560/562
- Mighty Mule MM600/660
Important Note: This control board is not compatible with the following models:
- Mighty Mule FM200
- Mighty Mule MM260
- Mighty Mule FM350/352
- Mighty Mule MM360
All Mighty Mule accessories are designed to work seamlessly with the R4211 control board.
3. Key Features
- Durable and flexible replacement for original circuit boards.
- Supports both single and dual gate installations.
- Compatible with all Mighty Mule accessories.
- Handles push-to-open and pull-to-open gate configurations.
- Flexible power input options: direct power from a solar panel or an AC transformer.
4. Installation
Safety First: Before beginning any installation or replacement, ensure that all power to the gate opener system is disconnected. This includes both AC power and battery power. Failure to do so can result in serious injury or damage to the equipment.
4.1. Replacing the Control Board
The R4211 control board is designed as a direct replacement. Note that while older models may have featured a blue board, the current replacement board is typically green or red. The functionality remains consistent.

Figure 1: Example of an older blue Mighty Mule control board.

Figure 2: The Mighty Mule R4211 replacement control board (green version).
- Access the Control Box: Open the gate opener's control box to expose the existing control board.
- Document Connections: Before disconnecting any wires, take clear photographs or make detailed diagrams of all wire connections to the old board. Pay close attention to the labels for power input, control outputs, and control inputs.
- Disconnect Wires: Carefully disconnect all wires from the old control board.
- Remove Old Board: Unscrew or unclip the old control board from its mounting points.
- Install New Board: Mount the new R4211 control board in the same location.
- Reconnect Wires: Using your photographs or diagrams, carefully reconnect all wires to the corresponding terminals on the new R4211 board. Ensure all connections are secure.
- Verify Connections: Double-check all wiring against your documentation to prevent misconnections.
- Close Control Box: Securely close the control box.
- Restore Power: Reconnect battery power, then AC power.
4.2. Initial Setup and Programming
After installation, refer to your specific gate opener model's manual for instructions on programming remote controls, setting limits, and adjusting other operational parameters. The R4211 board supports these functions as per your gate opener's design.
5. Operating Instructions
The R4211 control board facilitates the operation of your automatic gate opener. Once installed and programmed, the gate opener will function according to its original design and your programmed settings.
- Single Gate Operation: For single gate setups, the board controls one gate arm.
- Dual Gate Operation: For dual gate setups, the board coordinates the movement of two gate arms.
- Push-to-Open / Pull-to-Open: The board supports both gate opening directions, configurable during the initial setup of your gate opener system.
- Power Source: The system can be powered directly from a solar panel or an AC transformer, depending on your gate opener model and installation.
Refer to your gate opener's primary user manual for detailed instructions on using remote controls, keypads, and other accessories with the system.
6. Maintenance
The R4211 control board is designed for durability and requires minimal maintenance. However, periodic checks of the overall gate opener system are recommended to ensure longevity and optimal performance.
- Visual Inspection: Periodically inspect the control board for any signs of damage, corrosion, or loose connections.
- Cleanliness: Keep the control box interior clean and free from dust, insects, and moisture.
- Wiring Integrity: Ensure all wiring connections remain tight and free from fraying or damage.
- Power Supply: Verify that the power supply (battery, solar panel, or AC transformer) is functioning correctly and providing stable power.
For detailed maintenance procedures for your entire gate opener system, consult your gate opener's specific user manual.
7. Troubleshooting
If your gate opener system experiences issues after replacing the control board, consider the following troubleshooting steps:
- No Power: Check all power connections, including the battery and AC transformer. Ensure the fuse on the control board is intact.
- Gate Not Responding: Verify that all wires are correctly connected to the R4211 board according to your documentation. Re-check programming of remotes and limits.
- Intermittent Operation: Inspect for loose wiring or environmental factors affecting sensors or remote signals.
- Gate Opens Partially: Re-verify the limit settings for your gate opener.
For more complex issues, it is recommended to consult the comprehensive troubleshooting guide in your gate opener's main manual or contact Mighty Mule technical support.
8. Specifications
| Model Number | R4211 |
| Part Number | 3636830 |
| Compatibility | Mighty Mule FM500/502, MM560/562, MM600/660 |
| Gate Type Support | Single and Dual Gate Installations |
| Power Input Options | Solar Panel or AC Transformer |
| Manufacturer | Mighty Mule |
| Item Package Quantity | 1 |
9. Warranty & Support
The Mighty Mule R4211 Replacement Control Board is backed by a 12-month limited warranty from the date of purchase. This warranty covers defects in materials and workmanship under normal use.
For warranty claims, technical assistance, or further support, please contact Mighty Mule customer service or visit the official Mighty Mule website.
Online Support: For additional resources and support, visit the Mighty Mule Store.





