Fixed Wires Sensor on LiftMaster Commercial Opener

When a commercial garage door stops responding correctly or shuts down unexpectedly, one of the most common causes is a damaged or loose sensor wire. Today, our team repaired a faulty wire connection on a LiftMaster commercial garage door opener, restoring full, safe operation for the business.

Call today for a free over-the-phone estimate (720) 999-5723.

What Was Going On?

Commercial LiftMaster openers rely on a network of wires and sensors to monitor door movement, detect obstructions, and ensure the motor runs safely. When a wire becomes loose, frayed, or disconnected:

  • The opener may only move a few inches

  • The door may reverse for no clear reason

  • Safety sensors stop communicating

  • The operator shuts down to protect the motor

That’s exactly what happened on this job — the door would not complete a full cycle due to faulty wiring in the sensor system.

What We Fixed

Our tech located the damaged wire connection inside the operator housing. After testing voltage and continuity, we:

  • Identified the failing sensor wire

  • Cut out the damaged section

  • Installed new, secure wiring connections

  • Ensured proper routing so the wire won’t pinch or rub

  • Tested the opener through multiple full open/close cycles

Once repaired, the LiftMaster opener responded instantly and returned to smooth, reliable operation.

See our complete list of garage door repair services. 

Why This Repair Matters

Commercial doors are heavy, cycle often, and depend on reliable sensors to keep employees and equipment safe. Faulty wiring is one of the quickest problems to address—but also one of the most disruptive if ignored.

Fixing the wire restored:

  • Correct door travel

  • Full safety sensor function

  • Smoother motor performance

  • Reduced wear on commercial hardware

Commercial Garage Door Not Working?

If your LiftMaster opener is stopping, reversing, or showing sensor errors, give Harmony Garage Door Repair Denver a call. We provide fast, same-day commercial diagnostics and repairs that keep your business running smoothly.

See our list of Denver services areas.