Hormann Motor Weak / Mechanical Drag

Door moves very slowly or struggles, operator hums loudly

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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

Aging motor capacitor (on AC motors), Dry or seized door rollers, Misaligned tracks, Failing motor windings

How to Fix / Troubleshooting

Safety first: Disconnect power. Do not continue to run a struggling motor; it can overheat.

Step-by-step:

  • Manual test: Disengage the operator and move the door by hand. If it is heavy or jerky, service the door hardware (rollers, hinges, tracks) and have springs adjusted by a professional.
  • Inspect capacitor (if fitted): Many Hormann AC operators use a start/run capacitor mounted near the motor. Look for bulging or leaking. Replace with an identical value and voltage rating.
  • Check rail and carriage: Ensure the rail is straight and the carriage slides freely.
  • Retest: If the door hardware is smooth and a new capacitor does not help, the motor is likely failing and should be replaced.
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Repair Difficulty

Hard 4/5

Required Part

Motor Start/Run Capacitor or Motor Unit
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