12
Marantec
Thermal Overload or Overuse Protection
Display shows “12”; opener stops mid‑travel and will not respond until power is cycled.
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Safety Warning
This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.
If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.
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Possible Causes
Excessive consecutive cycles causing motor overheating, Door binding causing high current draw, Faulty thermal sensor on motor or board, Poor ventilation around opener head
How to Fix / Troubleshooting
Safety first: Do not continue to cycle an overheated motor; allow it to cool to prevent permanent damage.
- Allow cool‑down: Leave the opener powered but unused for 20–30 minutes to allow the motor and control board to cool.
- Check door mechanics: Disconnect the opener and move the door by hand. If it is stiff or noisy, correct mechanical issues (lubricate, align tracks, replace bad rollers) to reduce load.
- Reduce cycling: Avoid using the opener for rapid, repeated cycles (e.g., testing dozens of times in a row). Marantec residential units are rated for a limited number of cycles per hour.
- If code appears with light use: The thermal sensor or motor windings may be failing. Replace the motor assembly or complete opener head.
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Repair Difficulty
Medium
3/5
Required Part
Marantec Motor Assembly
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