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LiftMaster 3850 Support Question

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Question posted by wlopez100 on March 24th, 2021

My Door In Close Position Start To Close Intead Of Openning De Door. It Change T

The direction of the belt changed by itself. The unit was operating pertfectly. Liftmaster 3850PI turned power on and offI reprogramed the belt openning and close position with the black and red button. But the problem persist. The change continue in the wrong direction.

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Request from miguel11fontan on August 25th, 2021 9:52 AM
Can you please elaborate how you were able to fix this issue?

I am having the same exact problem and the video in th eslution did not help.

Thank you!

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Answer #1: Posted by techyagent on March 25th, 2021 4:33 AM

This answer was accepted by the poster of the original question.

techyagent

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Please check this video tutorial

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Related LiftMaster 3850 Manual Pages

3850 Elite Series Manual - Page 1

... 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 lens on...

3850 Elite Series Manual - Page 8

...garage door. 2. Close the door and mark the inside vertical centerline of Garage Door 2x4 OPTIONAL CEILING MOUNT FOR HEADER BRACKET Structural Supports Level (optional) Installation procedures vary according to garage door... 2" (5 cm) Track Highest Point of Travel Door Header Wall Track 2" (5 cm) Highest Point Door of the door. Open your garage, use lag screws (not provided) to securely...

3850 Elite Series Manual - Page 13

... operate or play with door control push buttons or remote controls. • Activate door ONLY when it can be connected to protrude above wall surface. • Position bottom of the door control is slower at this time. If installing into gang box) as follows: • Install bottom screw, allowing 1/8" (3 mm) to each garage door opener. CAUTION: Continuous exposure of closing garage door...

3850 Elite Series Manual - Page 14

...turn OFF. • Reverse the procedure to close the lens. • Use A19, standard neck garage door opener bulbs for approximately 4-1/2 minutes when power is unplugged. • Using a Phillips head screwdriver, remove the battery cover on the motor unit. • Partially insert battery into motor unit with terminals facing out. • Connect the red (+) and black...fully open position. To...

3850 Elite Series Manual - Page 15

... plug will only fit into the outlet you could result in an open or closed. and the ground wire to avoid entanglement. Secure with an overhand knot at least 1" (2.5 cm) from a falling garage door: • If possible, use emergency release handle unless garage doorway is grounded. Ensure that the rope and handle clear the tops...

3850 Elite Series Manual - Page 16

... in the down direction. above garage floor. If an obstruction breaks the light beam while the door is closing garage door: • Correctly connect and align the safety reversing sensor. The units must be disabled. • Install the safety reversing sensor so beam is necessary to the garage door opener BEFORE installing the safety reversing sensor. Be sure power is necessary...

3850 Elite Series Manual - Page 18

...Red White Grey Quick-Connect Terminals If the receiving eye indicator light is already open...door is required. • Loosen the sending eye wing nut and readjust, aiming directly at opener connections. • Incorrect wiring between sensors and opener. • A broken wire. 2. See page 16. Separate white and white/black... power to grey (Figure 6). The opener lights will not close....

3850 Elite Series Manual - Page 21

...; If holes in curved arm are above holes in the same way, using the 5/16"x1-1/4" clevis pin. SECTIONAL DOORS ONLY Make sure garage door is operated. Slide the outer trolley back (away from the door) about 6" (15 cm) from the inner trolley. Figure 2: • Bring arm sections together. Find two pairs of holes that...

3850 Elite Series Manual - Page 22

... 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. NOTE: Adjusting the limits on the following page, the door should not have a "backward" slant when fully open position. ALL ONE-PIECE DOORS 1. Figure 4 Door Bracket Clevis Pin 5/16"x1-1/4" Ring Fastener Straight Arm Bolts 5/16...

3850 Elite Series Manual - Page 23

... door will stop the door. Adjust the position of the door by a closing the door (Figure 3). 4. Black moves the door UP (open ) position. Door MUST reverse on contact with proper operation of garage door travel limits will interfere with 1-1/2" (3.8 cm) high object (or 2x4 laid flat) on the door, you may toggle the door back and forth using the black and purple buttons. Push the door...

3850 Elite Series Manual - Page 24

... or programmed remote control. If the garage door opener cannot open and close the door. 1. Door MUST reverse on contact with proper operation of force required to compensate for the force to be set properly. Figure 1 n n LED Black Button Purple Button Figure 2 Push Purple button twice to ensure that it is balanced properly and is not stopping exactly where you would like...

3850 Elite Series Manual - Page 25

... the Safety Reversal System TEST • With the door fully open the door. • Place the opener carton in the down direction. Door MUST reverse on contact with 1-1/2" high (3.8 cm) object (or 2x4 laid flat) on the floor, centered under the garage door. • Operate the door in the path of the opener. The garage door opener will flash. IMPORTANT SAFETY CHECK: Test the...

3850 Elite Series Manual - Page 26

... DEATH: 1. Garage door MUST reverse on contact with the opener lights on, then press and hold the light button for 10 seconds until completely closed , it will reverse. 3. See Programming. If obstructed while closing , the door will close . They will turn on the floor. Your opener will open. 2. If fully open position, it will operate with the door control...

3850 Elite Series Manual - Page 27

... Entry Accessories. LIGHT Light feature Press the Light button to turn it detects a Language Degrees (F/C) LOCK person entering the garage. (PROG) Learn Feature The door control is activated. 27 Press again to be changed to the unit. LOCK Lock feature Designed to prevent operation of the remote control to turn the opener light on the LCD display. To activate...

3850 Elite Series Manual - Page 28

... The remote control will turn on 10 consecutive times without opening the door. 1. Press and hold the Light button on a non-metallic surface. To replace the batteries, remove the two screws and open the remote control housing. Replace the batteries with after pressing a button same type 3V2016 coin cells. 28 With the door closed, press and hold the...

3850 Elite Series Manual - Page 29

...unit is operating on battery power and 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 ...and battery power BEFORE performing ANY service or maintenance. • Use ONLY LiftMaster part number 485LM for disposal instructions. Battery may be fully charged to operate the motor unit. To ...

3850 Elite Series Manual - Page 30

... down on the next UP or DOWN operation, either manually or by using the door control or remote. If it is unbalanced or binding, call a trained door systems technician. • Check to pull door open door falling rapidly and/or unexpectedly. • NEVER use emergency release handle unless garage doorway is CLOSED. Make any necessary adjustments (see pages...

3850 Elite Series Manual - Page 31

... unit: The safety reversing sensor must be connected and aligned correctly before the garage door opener will not turn off of any binding problems. • Refer to 5 turns. The trolley should travel towards the door and stop bolt. • Release the door from the opener by pulling the Emergency Release Rope. • Manually bring the door to a closed position. • Loosen the belt...

3850 Elite Series Manual - Page 32

...Located On Motor Unit "Learn" Button LED or Diagnostic LED "Learn" Button Installed Safety Reversing Sensor Your garage door opener is programmed with jumper wire. Symptom: The door doesn't activate from motor unit. If motor unit activates, replace door control. • If motor unit does not activate, disconnect door control wires from the door control. • Inspect door control/wires...

3850 Elite Series Manual - Page 35

... the existing PIN is already mounted outside the garage. 1. To Add, Reprogram or Change a Keyless Entry PIN NOTE: Your new Keyless Entry must be programmed to operate your personal entry PIN (not the last temporary PIN), then press and hold the ✽ button. USING THE "LEARN" BUTTON USING THE DOOR CONTROL LOCK LIGHT 1. Press the new 4-digit...