Marantec 116421 Control Box for Synergy 200 Series, Replaced by 197963
The Marantec 116421 control box is the main electronic control assembly for the Synergy 200 Series opener family. It coordinates the opener motor, travel logic, wall station, remote input, light functions, and safety circuits. When this part fails, the opener may not respond, may show fault behavior, may lose accessory communication, or may have burned or damaged terminal areas after a surge or wiring fault.
This is a critical fitment part. The 116421 number is commonly associated with Synergy 260, Synergy 270, and Synergy 280 models, and several listings note that it has been replaced by or cross-referenced with 197963. Before ordering, compare the original board/control box label, connector locations, and opener model. Similar Synergy 300 and Synergy Solo control boxes are not interchangeable just because they are from the same manufacturer.
Compatible With
- Marantec Synergy 260 garage door operators
- Marantec Synergy 270 garage door operators
- Marantec Synergy 280 garage door operators
- Select Marantec Synergy 200 Series operator heads that originally used control box 116421
- Applications where 197963 is confirmed as the correct replacement for 116421 by supplier or Marantec documentation
- Not intended for Synergy 360, 370, 380, Synergy Solo, M-Line, Q-Line, or EOS operators unless the parts diagram confirms the part number
Features and Specifications
| Manufacturer | Marantec |
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| Product Type | Control box / logic control assembly |
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| Part Number | 116421 |
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| Related Replacement Reference | 197963 where confirmed |
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| Application | Control electronics for select Synergy 200 Series operators |
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| Compatible Operator Type | Residential Marantec garage door openers |
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| Common Models | Synergy 260, Synergy 270, Synergy 280 |
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| Safety Monitoring | Works with the opener safety circuits as designed for the operator |
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| Programming Notes | May require setup, travel/force checks, remote/accessory reprogramming, and safety testing after replacement |
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Also Known As / Related Part Numbers
- 116421
- MAR-116421
- Marantec 116421
- 116421 control box
- Synergy 200 control box
- Synergy 260 control box
- Synergy 270 control box
- Synergy 280 control box
- 197963
- Marantec 197963
- Related but different: 116422 Synergy 300 control box, 122943 Synergy Solo control box
Technician Note
Control box replacement should follow diagnosis. A bad wall station, shorted accessory wire, miswired photo eye, failed transformer, or surge-damaged terminal can mimic a bad control box.
Before Ordering Checklist
- Confirm the opener model is Synergy 260, 270, or 280
- Match the original control box number 116421 or confirmed replacement 197963
- Compare connector layout and terminal markings
- Inspect transformer output, safety sensor wiring, and accessory wiring before installing the new box
- Plan to perform setup checks and safety testing after replacement
Professional Advisory
Control box service involves internal opener wiring and safety circuits. Use a qualified garage door technician when diagnosis is unclear, when wiring is damaged, or when the opener will not pass safety reversal testing after repair.
Important Ordering Warnings
- 116421 has a replacement/cross-reference concern with 197963. Confirm current availability and replacement status before upload or ordering.
- Do not use a Synergy 300 or Synergy Solo control box as a substitute for a Synergy 200 Series control box.
Product Questions and Answers
Which openers use the Marantec 116421 control box?
The 116421 control box is commonly used on Marantec Synergy 260, Synergy 270, and Synergy 280 garage door openers.
What is the 197963 number related to?
197963 is commonly referenced as a replacement or related part number for the 116421 control box. Confirm the replacement by supplier data or the Marantec parts diagram before ordering.
What symptoms may indicate a bad control box?
Symptoms may include no response, intermittent operation, burned terminals, accessory communication issues, or logic faults after power and wiring have been checked.
Will replacing the control box require programming?
Yes, setup checks may be needed. Remote programming, travel/force settings, wall control operation, and safety sensor function should be verified after replacement.
Can this control box be used to bypass safety sensors?
No. Required safety devices must remain connected and working. Do not bypass photo eyes or other safety circuits.
