Hormann
Drive Disconnection / Gear Failure
Operator runs but door does not move (motor spins freely)
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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
Stripped drive gear inside operator, Broken sprocket on chain drive, Loose drive pulley on motor shaft
How to Fix / Troubleshooting
Safety first: Disconnect power. Support the door; do not rely on the operator to hold it.
Step-by-step:
- Check carriage and chain/belt: Confirm that the chain/belt is moving when the motor runs. If the chain/belt moves but the carriage does not, the carriage is faulty.
- Open operator housing: Inspect the internal gears and sprockets. Look for plastic shavings or broken teeth.
- Replace damaged parts: Depending on the model, you may replace a gear kit, sprocket, or the entire motor/gearbox assembly.
- Reassemble and test: After replacement, re‑set travel limits and test operation.
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Repair Difficulty
Hard
4/5
Required Part
Internal Drive Gear / Sprocket Assembly or Carriage
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