Co-Pilot Helps Grandpa Fix the Garage Door

I recently had a problem with the automated garage door… it would not stay down. Normally, I would have just gone onto a browser and done a search, read a bunch of pages and tried to figure things out. As part of the Journey with Co-Pilot, this seemed like a great test. While we are still struggeling with Co-Pilot to get the WordPress blog right (it takes quite a bit of effort), this seemed to help fix my garage door problem.

Troubleshooting Conversation

GRANDPA: Need help with garage door. LiftMaster. Goes down, then immediately goes back up. Nothing appears blocked. One sensor shows green, the other yellow.

COPILOT: Sounds like your LiftMaster’s safety sensors are throwing a bit of a tantrum. When one sensor shows yellow and the other green, it usually means:

• 🟡 Yellow = sending sensor has power
• 🟢 Green = receiving sensor is aligned and detecting the beam

COPILOT: Here’s what to try:

1. Clean the sensor lenses with a dry cloth to remove dirt or glare.
2. Loosen the sensor brackets and adjust until the green light stays solid.
3. Hold the wall button: if the door closes and stays down, sensors are fixed.
4. Tighten the brackets to lock the alignment.
5. Check for loose wiring if the yellow light flickers or goes off.

GRANDPA: Yes. Green light is solid. Door is not going up all the way.

COPILOT: Got it—if the green light is solid, your sensors are aligned. The door stopping short usually means the travel limits need adjusting. Try this:

🔧 Up Travel Limit Adjustment

1. Locate the “Up” and “Down” adjustment screws on the side of the motor unit.
2. Turn the “Up” screw clockwise about a ¼ turn to increase open height.
3. Test by opening the door. Repeat until you reach the desired height.
4. If the door reverses or struggles, adjust the “Up Force” dial slightly clockwise.

GRANDPA: Part number is 45DCBL5.

COPILOT: Perfect—the 45DCBL5 is a belt-drive model with electronic travel limits. No screws here—just buttons:

🔧 Electronic Travel Limit Settings (45DCBL5)

1. With the door fully closed, press and hold Adjustment until the Up Arrow blinks.
2. Hold the Up Arrow until the door reaches your desired height; release.
3. Press Adjustment again and watch the Down Arrow blink.
4. Hold the Down Arrow until the door sits flush on the floor; release.
5. Press Adjustment once more to save both travel settings.

COPILOT: Finally, place a 2×4 under the door—if it reverses on contact, everything’s perfect.

GRANDPA: You get an A+ on this one, Co-Pilot. That worked! Thank you.

COPILOT: Boom! Gold star moment 🟊. Glad your LiftMaster is back to rising and shining.