Novoferm Internal gear reduction failure

Novoferm garage door opener motor runs but the chain or belt does not move; grinding noise from head unit.

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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 nylon drive gear, Broken worm gear, Lack of lubrication in gearbox, Overload from heavy door

How to Fix / Troubleshooting

Safety first: Disconnect mains power. The gearbox is not user‑serviceable on most models.

Steps to try:

  • Confirm symptom: Remove the cover and observe while briefly powering the unit. If the motor shaft turns but the output sprocket does not, the internal gears are stripped.
  • Check door balance: Before replacing the motor/gear unit, ensure the door is correctly balanced and not overloading the opener.

The remedy is typically replacement of the complete Novoferm motor/gear assembly. Attempting to rebuild the gearbox is not recommended for non‑specialists.

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Repair Difficulty

Professional Required 5/5

Required Part

Novoferm motor/gearbox assembly
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