Henderson Travel Calibration Lost or Obstruction

Garage door opener runs but door moves only a few centimeters then stops.

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.

Possible Causes

Lost travel limits, Faulty limit encoder, Binding door, Slipping drive sprocket

Safety first: Keep the opening clear while recalibrating travel.

Steps:

Manual door check: Disconnect the opener and move the door by hand to ensure it moves freely.
Reprogram limits: Follow the Henderson procedure to reset open and close limits from scratch.
Inspect encoder and sprocket: Check the limit encoder and drive sprocket for damage or looseness. Replace the Henderson limit encoder assembly or tighten sprocket as needed.

Medium 3/5

Henderson Limit Encoder Assembly

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