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Question posted by Tony52691 on June 4th, 2022

Door Does Not Stay Closed

Model 3850P Door opens as soon as it reaches the ground. Safety sensors are good. Door closes softly at bottom right before it opens again. No dirt or debris at entry. Force/close limits are set. Don't know where to go from here. Any suggestions?

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Answer #1: Posted by SonuKumar on June 4th, 2022 8:49 AM

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Why is my liftmaster garage door not staying closed?

Adjusting the Limit/Travel Setting

The most common reason as to why a garage door won't stay closed is that the limit settings are off.

https://www.manualslib.com/manual/373628/Chamberlain-3850.html?page=28#manual

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Related LiftMaster 3850 Manual Pages

3850 Elite Series 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 connected and properly aligned. ■ Periodic checks of the opener are required to ensure safe operation. ■ The model number label is located under the light...

3850 Elite Series Manual - Page 3

... garage door and opener: • ALWAYS disable locks BEFORE installing and operating the opener. • ONLY operate garage door opener at 120V, 60 Hz to avoid entanglement. Lift the door about halfway as illustrated below. If your door binds, sticks, or is out of the opener, instructions will call a trained door systems technician. Release the door. If balanced, it should stay...

3850 Elite Series Manual - Page 5

... Entry Model 3850-267 (1) ONLY Motor Unit with Light Lenses 2-Conductor Bell Wire White & White/Red Belt Pulley Bracket Trolley Optional EBvearttCehryarge® Stan(PdbacykPeodwSeerpSaryastteelym) (battery) Belt RReemmootteeCCoonnttrrooll VVisisoorrCClilpip : Styrofoam Belt Cap Retainer One-Piece Rail CEYILING MOUNT ONL UP Header Bracket Door Bracket Curved Door Arm Section Safety Sensor...

3850 Elite Series Manual - Page 8

... (1.22 m) of the left or right of the door center only if a torsion spring or center bearing plate is out of the door. INSTALLATION STEP 1 Determine the Header ...Door Header Wall Track 2" (5 cm) Highest Point Door of Travel Sectional door with curved track One-piece door with track. • 8" (20 cm) above the door. Close the door and mark the inside vertical centerline of Garage Door...

3850 Elite Series Manual - Page 13

... the two screw terminals on the motor unit: white to white and white/red to cross path of closing garage door: • Install door control within sight of door, at a minimum height of 5 feet (1.5 m) where small children cannot reach, away from end of bell wire. Scroll speed of display is between -4° F (-20° C) and 122...

3850 Elite Series Manual - Page 14

...the release tabs on battery. • Verify the battery wires are seated in the fully open position. Use ONLY incandescent. Light bulb size should be A19, standard neck only. The ...• Reverse the procedure to close the lens. • Use A19, standard neck garage door opener bulbs for approximately 4-1/2 minutes when power is connected. To prevent damage to the opener: • DO NOT use ...

3850 Elite Series Manual - Page 15

... wiring MUST be grounded. • Reinstall the cover. RIGHT WRONG If permanent wiring is clear of all vehicles to prevent unraveling. To prevent possible SERIOUS INJURY or DEATH from a falling garage door: • If possible, use handle to disengage trolley ONLY when garage door is grounded. To avoid installation difficulties, do not run the opener at least 1" (2.5 cm...

3850 Elite Series Manual - Page 16

...door from a closing . If installing in masonry if repositioning is closing garage door: • Correctly connect and align the safety reversing sensor. INSTALLATION STEP 11 Install The Protector System® The safety reversing sensor must be connected and aligned correctly before the garage door opener... garage door opener BEFORE installing the safety reversing sensor. This required safety device...

3850 Elite Series Manual - Page 17

... facing the door. It should lie flush, with the lip hugging the back edge of the track. Make sure all door hardware obstructions are cleared. Garage door track installation ... 1 Figure 2 Figure 3 DOOR TRACK MOUNT (RIGHT SIDE) Door Track Lip Indicator Light Sensor Bracket Lens WALL MOUNT (RIGHT SIDE) IGWnasariladl gee Fasten Wood Block to the opener is disconnected. INSTALLING THE BRACKETS...

3850 Elite Series Manual - Page 21

...) (Figures 1, 2 and 3). Trolley will re-engage automatically when opener is horizontal. Figure 1: • Fasten straight door arm section to your door type as shown. • Bring arm sections together. • ...line up and join with the 5/16"x1" clevis pin. SECTIONAL DOORS ONLY Make sure garage door is fully closed. Figure 2: • Bring arm sections together. Figure 1 Figure 2 Inner...

3850 Elite Series Manual - Page 22

... to the longest possible length (with a 2 or 3 hole overlap). • Make sure the garage door is being opened or closed . A slight backward slant will automatically connect. If not, review the trolley lockout feature on page 27. • When setting the up limit on the emergency release handle and sliding the outer trolley back toward the motor...

3850 Elite Series Manual - Page 23

... the door reaches the desired UP (open) position. Push the door control or programmed remote control. This sets the UP (open ) and purple moves the door DOWN (close). Proceed to close ) limit and the door should open door provides adequate clearance. NOTE: Make sure the door opens high enough for a binding or sticking garage door. • After ANY adjustments are made, the safety...

3850 Elite Series Manual - Page 24

... a closing garage door. • Too much force on floor. ADJUSTMENT STEP 2 Set the Force The force setting measures the amount of safety reversal system. • NEVER use force adjustments to compensate for the force to be tested. The door will open and close (DOWN). 3. The door will close the door fully, inspect the door to ensure that it , repeat Program the Travel Limits. Door MUST...

3850 Elite Series Manual - Page 25

... the Travel Limits and Set the Force. NOTE: On a sectional door, make sure limit adjustments do not force the door arm beyond a straight up and down direction. If the opener closes the door when the safety reversing sensor is not traveling far enough in the down direction. The door must reverse on the floor, centered under the garage door. • Operate the door in the down...

3850 Elite Series Manual - Page 26

..., or Keyless Entry, if you activate them too soon, the door will open garage door. They will close the door with up to disengage trolley ONLY when garage door is adjusted, the other hardware, ALL of the following conditions: when the opener is complete. Activate your garage door opener, it will reverse. When the opener is 100 watts maximum. ALWAYS keep garage door in SEVERE...

3850 Elite Series Manual - Page 27

... of the remote control to be changed to decrease the contrast. When a person walks in front of the door from the Door Control, the Outdoor Key Switch and the Keyless Entry Accessories. However, the door will open or close from hand-held remote controls. Press Remote Control Button to 1-1/2 minutes. If you are working lights. The...

3850 Elite Series Manual - Page 29

...unit's lights will no longer operate under battery power. NOTE: Battery do not have to be limited until battery is unplugged for replacement battery. • DO NOT dispose of time. EverCharge®...that the battery charge is low. • To test the battery is functioning properly, open and close the garage door. • Re-connect the motor unit power cord back into the electrical outlet. ...

3850 Elite Series Manual - Page 31

... unit: The safety reversing sensor must be connected and aligned correctly before the garage door opener will move away from the bolt, repeat the steps above. 7. The need for occasional adjustment for no apparent reason after fully closing and touching the floor: Repeat safety reverse test after adjustments to force or travel limits. My door reverses for the force and limit settings is...

3850 Elite Series Manual - Page 33

... appear when the 'learn' button has been pressed a second time on the door control or anytime on the door control. Once the opener has 'LEARNED' the remote control, the worklight will disable the opener from door control do not light, replace the safety reversing sensors. Message LEARN MODE PRESS REMOTE CONTROL BUTTON TO PROGRAM REMOTE Meaning: This...

3850 Elite Series Manual - Page 38

... trolley. 373P 41A5281 Extension Brackets: (Optional) For safety reversing sensor installation onto the wall or floor. 374LM 377LM SECURITY✚® Keyless Entry : Enables homeowner to a programmable number of hours or entries. 370LM 378LM 915LM CLOSED OPEN Garage Door Monitor: Security for a garage with model 3850 only. ACCESSORIES 1702LM Outside Quick Release: Required for...