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Hormann Incorrect Limit Position / Overtravel Detection

Display shows “d”, door reverses at top or bottom limit

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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

Limits set beyond mechanical stops, Door hitting physical stop before limit, Slipping drive causing miscounted travel, Encoder offset

How to Fix / Troubleshooting

Safety first: Disconnect power. Support the door if limits are incorrect to avoid sudden movement.

Step-by-step:

  • Inspect mechanical stops: Ensure the door has proper end stops and that nothing is blocking full open or full close.
  • Check drive coupling: Verify that the operator carriage is firmly attached to the door arm and that the arm is not loose on the door.
  • Reset limits: Follow the Hormann procedure to delete and re‑set the open and close limits. Do not set limits so that the operator tries to push the door beyond its physical stops.
  • Relearn force: Run a full cycle to allow the operator to adapt force limits.
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Repair Difficulty

Medium 3/5

Required Part

Travel Limit Settings (no part) or Carriage/Arm Assembly
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