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LiftMaster 8550 Support Question

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Question posted by BONNIECA92 on November 17th, 2021

Garage Door Opens After Shutting.

My Lift master 8550 inside keypad is Inside wall pad is model #880LM. outside keypad Model # is 877MAX. I find my garage door opened after closing. This has been going on for over a week. How do I fix this? Someone was pressing buttons on the inside keypad. Can you send me a manual for this unit so I can download it to my computer and make a copy. Thanks.Regards,Bonnie Lewis

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Answer #1: Posted by SonuKumar on November 18th, 2021 9:32 AM

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SonuKumar

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Why is my garage door opening after I close it?

Your garage door is programmed to travel a certain distance before it closes. If it closes before that distance has been traveled, it thinks something is wrong - and it reopens to help prevent any damage or safety risk. ... In cases like this, your "travel down" setting simply needs to be adjusted to the new distance.

https://www.youtube.com/watch?v=oujXp2w2WeA

https://www.youtube.com/watch?v=oujXp2w2WeA&t=115

https://www.youtube.com/watch?v=oujXp2w2WeA&t=199

https://www.youtube.com/watch?v=oujXp2w2WeA&t=212

https://www.youtube.com/watch?v=oujXp2w2WeA&t=323

https://www.youtube.com/watch?v=oujXp2w2WeA&t=347

https://www.clopaydoor.com/residential/buyingguide/residential-faq/why-does-my-garage-door-reverse-as-soon-as-it-hits-the-floor

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Answer #2: Posted by itasklive on November 18th, 2021 9:31 AM

itasklive

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The LiftMaster 8550 is a popular garage door opener. The LiftMaster 8550 has an automatic reversing system, which means that it can detect if something is in the way and then reverse the garage door opening motion. If the sensors are not working properly, then the garage door will open after shutting.

To fix this problem, check to see if the sensors are functioning properly by using your hand to cover them up while you close the garage door.

Related LiftMaster 8550 Manual Pages

8550 Manual - Page 1

... read this manual and the enclosed safety materials carefully! ■ Fasten the manual near the garage door after installation. ■ The door WILL NOT CLOSE unless the Protector System® is ONLY compatible with sectional doors. Belt Drive Garage Door Opener Model 8550 FOR RESIDENTIAL USE ONLY Write down the following information for installation instructions. . www.liftmaster.com...

8550 Manual - Page 2

The hazard may not work properly. 5. Read them . Check the Door 1. If balanced, it . An unbalanced garage door may be installed above the center of the door. Lift the door halfway up. Release the door. If your garage door and/or the garage door opener if you do not comply with the instructions and warnings contained in this Signal Word on the following...

8550 Manual - Page 3

... may look different. Pulley and bracket C. Header bracket B. Sprocket cover and screws K. Straight door arm A B CF G D E F. GARAGE DOOR OPENER ASSEMBLY A. Trolley G. Safety labels and literature H L M J N O I . Belt L. Depending on the garage door opener model purchased. Overview/Carton Inventory NOTE: Accessories will be included with white and white/black...

8550 Manual - Page 4

.... HARDWARE Mounted in the top of sprocket while garage door opener. Assembly 1 Attach the rail to the garage door opener NOTE: ONLY use ONLY those bolts/fasteners mounted in the garage door opener H1 (3) Hex Screw #8x3/8" (Packed with the sprocket cover) 4 Cut the tape from the garage door opener. Place the garage door opener on the packing material to prevent H1 To avoid...

8550 Manual - Page 6

... be enabled ONLY when operating a sectional door. Door MUST reverse on a one -piece or swinging garage doors. NOTE: If you are installing the garage door opener on .contact with vehicles to -Close functionality if operating either one -piece door, visit www.liftmaster.com for installation instructions. 6 Install garage door opener only on inside of the door. 10. To be caught in...

8550 Manual - Page 7

.... 1.3 Open your door to the highest point of travel clearance for installation instructions. 1.1 Close the door and mark the inside vertical centerline of Garage Door 2x4 OPTIONAL CEILING MOUNT FOR HEADER BRACKET Structural Supports Level (Optional) Sectional door with curved track 7 Draw an intersecting horizontal line on a one -piece or swinging garage doors. Header Wall 2" (5 cm...

8550 Manual - Page 9

... outer trolley. If the ladder is raised, pull the trolley release arm down to garage door, rest garage door opener rail on 2x4 placed on top section of door. 4.1 Remove the packing material and lift the garage door opener onto a ladder. NOTE: A 2x4 is ideal for the garage door opener. The trolley can remain disconnected until instructed. Insert the clevis pin (H5) through...

8550 Manual - Page 10

... the garage door opener To avoid possible SERIOUS INJURY from each side of the garage door opener to the support bracket. 5.3 Cut both pieces of the hanging bracket to required lengths. (not provided) H4 Finished Ceiling H4 Unfinished Ceiling 5.4 Attach the end of each hanging bracket to 5.5 Attach the garage door opener to the 5.6 Remove the 2x4 and manually close...

8550 Manual - Page 11

... (1.83 m) above the top of all vehicles to disengage trolley ONLY when garage door is clear of the emergency release rope through the hole in an open door falling rapidly and/or unexpectedly. • NEVER use emergency release handle unless garage doorway is CLOSED. or or To prevent possible OVERHEATING of the emergency release rope through...

8550 Manual - Page 13

... will re-engage automatically when the garage door opener is hanging down too far, you may cut 6 inches (15 cm) from the curved door arm. the door) about 2" (5 cm). Attach with the ring fastener (H11). CORRECT Straight Door Arm (Groove facing out) Curved Door Arm INCORRECT Straight Door Arm Curved Door Arm 9.1 Close the door. Select two aligned holes (as far...

8550 Manual - Page 17

... installing the safety reversing sensors check the following: • Sensors are installed inside the garage, one on the sensor LEDs will move in the down until the garage door opener has completed 5 cycles upon power up. above floor The sleep mode shuts the garage door opener down direction. above floor Invisible Light Beam Protection Area 17 Safety Reversing Sensor...

8550 Manual - Page 21

... electric shock, your local code, refer to the 7/8" hole. 1.7B Run wires through the 7/8" hole in the garage door opener into a grounded outlet. 1.2A DO NOT run garage door opener at this time. Be sure the opener is required by your garage door opener has a grounding type plug with a third grounding pin. To avoid installation difficulties, do not activate the...

8550 Manual - Page 22

... will flash ten times. Power 2 Ensure the Safety Reversing Sensors are aligned The door will not close . Amber LED If the receiving sensor is power to the garage door opener. Make sure the sensor wire is closing, the door will reverse and the garage door opener lights will glow steadily if they are aligned and installed and aligned correctly. IF...

8550 Manual - Page 25

..., persons (particularly small children) could be SERIOUSLY INJURED or KILLED by a closing garage door. • Safety reversal system MUST be tested. When the door reverses upon contact with the board. If the garage door opener closes the door when the safety reversing sensor is misaligned or obstructed). The garage door opener will flash 10 times. If the test continues to the fact...

8550 Manual - Page 28

.... Garage door MUST reverse on contact with garage door control push buttons or remote controls. 3. ALL repairs to door travel. 4. The door could result in an open or closed . 5. DO NOT enable the Timer-to garage door opener BEFORE making ANY repairs or removing covers. 14. NO ONE SHOULD CROSS THE PATH OF THE MOVING DOOR. NO ONE SHOULD GO UNDER A STOPPED, PARTIALLY OPENED DOOR...

8550 Manual - Page 29

... door is closed and the garage door opener is compatible with up to 40 remote controls. When the door is in ; The garage door opener will turn off and whenever the garage door opener lights turn on when someone enters through a wall-mounted door control, remote control, wireless keyless entry or MyQ™ accessory. The lights will not go into the sleep mode until the door...

8550 Manual - Page 30

... entry should be installed in the event of time, then shut off . Door Control USING THE DOOR CONTROL SYNCHRONIZE THE DOOR CONTROL To synchronize the door control to the garage door opener, press the push bar until the garage door opener activates (it will not control the lights when the door is in motion. AUTOMATIC LIGHT Motion Sensor Factory default is activated...

8550 Manual - Page 34

... 212°F (100°C) or incinerate. Adjust if necessary (refer to Adjustment section). The garage door opener does not require additional lubrication. EVERY YEAR • Oil door rollers, bearings and hinges. To replace the batteries, remove the two screws and open or closed if possible. 2 Pull down . Repeat the safety reverse test. Insert replacement batteries positive...

8550 Manual - Page 36

... the sensors apparent reason while temporarily obstructed from your door is closing , secure rails or re-install the sensor brackets to the wall or floor, refer to set to ensure the garage door opener is binding or sticking, contact a trained door systems technician. touching the floor 4-4 4 FLASHES 4 FLASHES My door reverses for binding or obstructions. My remote control...

8550 Manual - Page 39

...The Garage Door Opener Surge Protector is designed to 4 MyQ™ compatible garage door openers and close the door and a lock feature for up to protect LiftMaster® garage door openers against damage from lightning and power surges. Includes visor clip. 881LM SECURITY+®2.0 Keyless Entry: For use outside of the home to enable access to monitor and control garage door openers and...