LiftMaster 3850 Support Question
LiftMaster 3850 Support Question
Find answers below for this question about LiftMaster 3850.Need a LiftMaster 3850 manual? We have 1 online manual for this item!
Question posted by Ajdettbarn on August 29th, 2022
Door Opening Problem
When I use the 3850 door opener, the garage door only opens about 6" then closes. When Ibhit the button again, it goes up about 2 feet, then closes. After a couple more opening cycles, it will open all the way, but the unit blink. Can you help me troubleshoot this please?
Current Answers
Answer #1: Posted by SonuKumar on August 29th, 2022 8:02 AM
SonuKumar
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https://www.manualslib.com/manual/373628/Chamberlain-3850.html?page=28#manual
follow all the pages of troublshotting
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Related LiftMaster 3850 Manual Pages
3850 Elite Series Manual - Page 1
...;
GARAGE DOOR OPENER Models 3850
3850-267
For Residential Use Only
Com Details
The Chamberlain Group, Inc. 845 Larch Avenue Elmhurst, Illinois 60126-1196 www.liftmaster.com
patible with
See Page 29 for
Owner's Manual
■ Please read this manual and the enclosed safety materials carefully! ■ Fasten the manual near the garage door after installation. ■ The door...
3850 Elite Series Manual - Page 2
...25
Operation
26-33
Operation safety instructions 26
Using garage door opener 26
Using the wall-mounted door control 27
Using the remote control 28
Troubleshooting 28
The remote control battery 28
EverCharge® Standby Power System (optional 29
To open the door manually 30
Care of damage to your opener 30
Having a problem? (Troubleshooting 31
Diagnostic chart 32
Smart...
3850 Elite Series Manual - Page 3
...; NEVER try to loosen, move or adjust garage door, door springs, cables, pulleys, brackets or their hardware, ALL of the opener, instructions will call for hand tools as shown. To prevent damage to garage door and opener:
• ALWAYS disable locks BEFORE installing and operating the opener.
• ONLY operate garage door opener at 120V, 60 Hz to avoid malfunction and...
3850 Elite Series Manual - Page 4
...
Safety
of your opener. Safety Reversing Sensor SECTIONAL DOOR INSTALLATION
Horizontal and vertical reinforcement is needed for details. Torsion Spring
Extension
Spring OR
Motor Unit
--- --- --
See page 12.
See page 19 for lightweight garage doors (fiberglass, steel, aluminum, door with the installation of door must not exceed 1/4" (6 mm). Survey your garage area to see...
3850 Elite Series Manual - Page 5
... for installation is packaged in the foam. Carton Inventory
Your garage door opener is also listed below . LOCK
LIGHT
SLmCaDrtMCootniotrnolDPeatencetli®ng Door Control Console
SECURITY✚® 3-Button Remote Control
Models 3850 (1) 3850-267 (2)
SECURITY✚® Keyless Entry Model 3850-267 (1) ONLY
Motor Unit with Light Lenses
2-Conductor Bell Wire White & White/Red...
3850 Elite Series Manual - Page 6
... 2
ASSEMBLY STEP 1 Attach the Rail to the Motor Unit
To avoid installation difficulties, do not run the garage door opener until the spring releases and snaps the nut ring against the trolley (Figure 1). This extends the spring for optimum belt tension. Washered Bolt 5/16"-18x1/2"
Rail Hole
USE ONLY THIS TYPE AND SIZE
BOLT
Motor...
3850 Elite Series Manual - Page 7
... of children at minimum height of 5 feet (1.5 m).
• away from ALL moving garage door opener: • ALWAYS keep hand clear of belt pulley while operating
opener. • SECURELY attach belt pulley cover BEFORE operating.
8x3/8" Hex Screws
HARDWARE SHOWN ACTUAL SIZE
Hex Screw #8x3/8"
WARNING
Belt Cap Retainer
Motor Unit Belt Pulley Mounting Plate
WARNING
INSTALLATION...
3850 Elite Series Manual - Page 8
... top edge of the garage door.
2. Open your door.
1.
Header Wall 2" (5 cm) Track
Highest Point of Travel
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.
DO NOT install header bracket over drywall.
• Concrete anchors MUST be used if mounting header bracket...
3850 Elite Series Manual - Page 11
... ceiling. To prevent damage to garage door, rest garage door opener rail on 2x4 placed on the trolley release arm to -rail distance.
• Raise the opener onto a stepladder.
Slide the outer trolley toward the motor unit.
Header Bracket
Top of Motor Unit
Top of Door
2x4 is not tall enough.
• Open the door all the way and place a 2x4 laid...
3850 Elite Series Manual - Page 21
... trolley with a ring fastener.
• Fasten curved section to the door bracket in straight arm, disconnect straight arm. Pull the emergency release handle toward the opener at a 45° angle so that the trolley release arm is ...
• 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 fully closed.
3850 Elite Series Manual - Page 22
... 5/16"-18x7/8
Lock Washers 5/16"
Nuts 5/16"-18
Curved Door Arm
Figure 5
Inner Trolley
Outer Trolley
Door Arm
Door Arm Connector Hole
Emergency Release Handle
Closed Door
Inner Trolley
Outer Trolley
Correct Angle
Door Arm
Open Door
Door with a 2 or 3 hole overlap).
• Make sure the garage door is being opened or closed from the inner trolley by pulling straight down on the...
3850 Elite Series Manual - Page 23
....
6. Push and hold until the door reaches the desired UP (open ) limit and begins closing garage door.
• Incorrect adjustment 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. This sets the UP (open ) position.
Figure 2
LED BLACK
PURPLE...
3850 Elite Series Manual - Page 24
... the garage door opener cannot open (UP).
4.
The LED will stop flashing when the force has been programmed.
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 enter unit into the Force Adjustment Mode.
Push the purple button twice to...
3850 Elite Series Manual - Page 26
... remote controls out of reach of which changes with garage door control push buttons or remote controls.
3. If one Security✚® Keyless Entry System. Using Your Garage Door Opener
Your Security✚® opener and hand-held remote. Your opener will reverse. If obstructed while closing , the door will close . Bulb power is activated. With an Smart Control Panel...
3850 Elite Series Manual - Page 27
... indicates that you disable the motion sensor when using the opener lights as follows: Press and hold the Lock button for a 3-1/2 minute interval, etc., up to Learn Remote.' Otherwise, they will also turn it detects a
Language Degrees (F/C)
LOCK
person entering the
garage.
(PROG) Learn Feature
The door control is reset to decrease the contrast. This...
3850 Elite Series Manual - Page 30
... when garage door is unbalanced or binding, call a
trained door systems technician. • Check to pull door open door falling rapidly and/or unexpectedly. • NEVER use handle to be raised and lowered manually as often as necessary. The trolley will reconnect on the emergency release handle and lift the door manually.
The door can then be sure door opens & closes fully...
3850 Elite Series Manual - Page 31
... unit then refer to 5 turns. My door will not close and the light bulbs blink on my motor
unit: The safety reversing sensor must be connected and aligned correctly before the garage door opener will...safety reverse test after adjustments to disengage. My remotes will not turn off of any binding problems.
• Refer to Adjustment Step 1, Program the Travel Limits. If the trolley re-...
3850 Elite Series Manual - Page 33
...control to
1-2 feet (30-60 ...opener is disconnected. Meaning: This message will appear if the Safety Reversing Sensors are out of alignment, if they are blocked or if the wiring is ready to motor unit using shortened wires. Message
LEARN MODE PRESS REMOTE CONTROL BUTTON... pressing the remote control button. Meaning: Battery is running on the door control.
Smart Control Panel...
3850 Elite Series Manual - Page 35
...) of times this temporary PIN will glow steadily for your garage door opener. Then press enter.
The opener light will blink twice. To set the number of your choice on the keypad. It can be changed by pressing only the ENTER button if the one button close the door even after it has learned the code. To set...
3850 Elite Series Manual - Page 38
...visitors or service persons. Tells you if your home! Wireless Door Control: Push bar, light feature and auxiliary button.
For use with NO access door. ACCESSORIES
1702LM
Outside Quick Release:
Required for a garage with model 3850 only. Enables homeowner to open or closed. Monitors up to 4 garage doors by disengaging trolley.
373P
41A5281
Extension Brackets:
(Optional) For safety...
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