Mighty Mule FM502 R4211 Circuit Board
The R5211 / R4211 control board is the main electronic control board used in compatible Mighty Mule, GTO and Linear swing gate opener systems. It coordinates the operator arm, receiver input, accessory terminals, auto-close timing, obstruction response and charging-related functions inside the control box. On FM500 and FM502 style systems, a board problem can show up as a dead operator, erratic movement, relay clicking, no transmitter response, blown fuses, inconsistent limits, or no power to accessories. Because these symptoms can also come from a weak battery, failed transformer, shorted accessory, damaged actuator cable, lightning surge or water inside the control box, the board should be diagnosed before replacement. The R4211 and R5211 numbers are often found together in replacement board listings, but the correct board depends on the printed part number, board generation, connector layout and operator model.
Compatible With
- Mighty Mule FM500 and FM502 swing gate operators when matched to the approved R4211/R5211 style replacement control board.
- Mighty Mule MM560, MM562, MM600 and MM660 model references are commonly listed for the current R4211 replacement control board.
- GTO / Linear PRO-SW2500, PRO-SW3000, PRO-SW4000 and selected XL series references appear in related R5211/R4211 board listings, but must be verified by board number and operator generation.
- Commonly associated with PCB3040 green replacement control board references in some parts listings.
- Not all XL, XLS, red-board, green-board and monitored-safety generations are interchangeable. Verify the original board number, connector layout and safety-device requirements.
Features & Specifications
| Manufacturer | Linear / GTO / Mighty Mule |
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| Product Type | Replacement gate opener control board |
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| Part Number | R5211 / R4211 related board reference |
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| Related Board Reference | PCB3040 in some listings |
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| Application | Single and compatible swing gate operator control box repair |
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| Compatible Operator Type | Select Mighty Mule, GTO and Linear swing gate operators |
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| Safety Monitoring | Depends on operator generation and board version |
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| Notes | Confirm board label, connector layout, color/generation and operator model before ordering |
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Also Known As / Related Part Numbers
- R5211
- R4211
- R5211/R4211
- PCB3040
- GTO R5211
- GTO R4211
- Mighty Mule R4211
- Mighty Mule FM500 control board
- Mighty Mule FM502 control board
- Linear PRO replacement control board
Technician Note
Always photograph the existing board and wire locations before removing anything. If the old board was damaged by lightning, water, insects, or a shorted accessory, installing a new board without correcting the source of failure can damage the replacement.
Before Ordering Checklist
- Read the printed board number from the existing circuit board.
- Confirm whether the operator is FM500, FM502, MM560, MM562, MM600, MM660 or a GTO/Linear PRO model.
- Compare connector layout, receiver wiring, accessory terminals and board color/generation.
- Inspect battery, transformer, fuses, actuator cable and accessories before blaming the board.
- Confirm any monitored safety device requirements before returning the gate to service.
Important Ordering Warnings
- The uploaded row names say R4211 while the mfgid says R5211. Treat these as related board references and verify the actual stocked board label.
- XL and XLS generation boards may not be interchangeable. Do not rely only on similar model names.
Professional Advisory
Control board replacement should be done with the gate secured and power disconnected. Do not bypass safety circuits or ignore monitored safety requirements. If the board failed from lightning, water intrusion, insect damage, or shorted accessory wiring, correct the cause before installing the replacement board.
Product Questions & Answers
Is R5211 the same as R4211?
R5211 and R4211 are commonly searched together and appear in related replacement board listings, but the exact board label, color and operator generation should be confirmed before ordering.
Which Mighty Mule models use this replacement control board?
The current Mighty Mule R4211 replacement board is listed for FM500/502, MM560/562 and MM600/660 models. Other GTO/Linear XL model references should be verified by board number and parts diagram.
What symptoms can point to a failed control board?
No motor output, dead accessory terminals, relay clicking with no gate movement, surge damage, water damage, erratic limits or repeated fuse issues can point to board trouble, but batteries, wiring and accessories should be checked first.
Will a new board need programming?
Yes. Limit, transmitter, auto-close and accessory settings may need to be reset after board replacement, depending on the operator and board version.
Can a board be replaced if safety devices are missing?
Do not bypass required safety devices. If the operator requires monitored photo eyes or other protection, the safety system must be installed and working correctly.
