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Question posted by GJO0688 on August 27th, 2019

Explain How To Get To The Logic Board On A Liftmaster 3800 Thank You

I Can't Open The Door. The Door Control Doesn't Light Up, But My Tester Shows Voltage. I Purchased A New Door Control Thinking That Was My Problem, But I Have The Same Issue. i Checked My Safety Reversing Sensors And Only One Has The Indicator Light Glowing. we Did Have A Bad Storm. Do You Think It Could Have Taken Out The Logic Board?

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Answer #1: Posted by Odin on August 27th, 2019 6:15 PM

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Related LiftMaster 3800 Manual Pages

3800 Manual - Page 1

® GARAGE DOOR OPENER Model 3800 For Residential Sectional Doors With Torsion Assemblies Only Com Details The Chamberlain Group, Inc. 845 Larch Avenue Elmhurst, Illinois 60126-1196 www.liftmaster.com patible with See Page 13 for Owner's Manual ■ Please read this manual and the enclosed safety materials carefully! ■ Fasten the manual near the garage door after installation. &#...

3800 Manual - Page 2

... travel limits 17 Setting the force 18 Test the safety reversal system 19 Test The Protector System 19 Test cable tension monitor 20 Test power door lock 20 To open door manually 20 Operation 21-25 Operation safety instructions 21 Using your garage door opener 21 Using the wall-mounted control console 22 Care of serious injury or death if...

3800 Manual - Page 3

..., life of this type of movement is no noticeable movement up to 180 sq. Planning Survey your garage area to see if any of the conditions below . - Motor unit Cable Tension Monitor Power Door Lock Remote Light Torsion Spring Drum Wall-mounted Access Door Control Console Safety Reversing Sensor Safety Reversing Gap between the floor and the bottom of the...

3800 Manual - Page 4

...• Disable ALL locks and remove ALL ropes connected to garage door BEFORE installing and operating garage door WARNING opener to avoid malfunction and damage. Lift the door about halfway as illustrated below. An unbalanced garage door may not reverse when required. • NEVER try to loosen, move or adjust garage door, door springs, cables, pulleys, brackets or their hardware, ALL of...

3800 Manual - Page 5

...;® 3-Button Remote Control (1) Remote Light with Hardware Bag 2-Conductor Bell Wire White & White/Red Power Door Lock 2-Conductor White & White/Black Bell Wire with Connector Cable Tension Monitor with 2-Conductor Green/White Bell Wires Mounting Bracket Motor Unit Safety Sensor Bracket (2) Collar with Screws The Protector System® (2) Safety Reversing Sensors (1 Sending Eye and...

3800 Manual - Page 6

... Unit To avoid installation difficulties, do not run the garage door opener until instructed to do so. • Loosen the collar screws. • Attach collar to either the left side installation. NOTE: For most installations the screws should be properly tightened. The door may not reverse correctly or limits may be lost due to the...

3800 Manual - Page 7

... BEFORE installing opener. 4. Check to garage door control. 10. Motor unit Staple Torsion Bar 7 WARNING INSTALLATION IMPORTANT INSTALLATION INSTRUCTIONS WARNING To reduce the risk of 5 feet (1.5 m). • away from torsion bar and remove the opener. Install garage door opener ONLY on contact with 14-10x1-7/8" screws. An unbalanced garage door might not reverse when...

3800 Manual - Page 10

... keep garage door in sight until the sensor beams are desired to operate the same garage door opener, it is slower at a minimum height of 5 feet (1.5 m) and away from a closing garage door. Do NOT pierce wire with 6AB x 1-1/4" self-tapping screws (drywall installation) or 6-32 x 1" machine screws (into drywall, drill 5/32" holes and use model 378LM wireless wall control...

3800 Manual - Page 14

INSTALLATION STEP 9 Install The Protector System® The safety reversing sensor must be connected and aligned correctly before the garage door opener will flash 10 times. The sending eye (with an amber indicator light) transmits an invisible light beam to the garage door opener CAUTION BEFORE installing the safety reversing sensor. If it is necessary to mount the units on the left or right...

3800 Manual - Page 15

... may be used. • Use bracket mounting holes as shown. Garage door track installation (preferred) (Figure 1): • Slip the curved arms over the rounded edge of the track. Install and align the brackets so the safety reversing sensors will face each side of the door, no higher than 6" (15 cm) above the floor. Snap into place...

3800 Manual - Page 16

... Bolt 1/4"-20x1/2" Lens TROUBLESHOOTING THE SAFETY REVERSING SENSORS 1. Use insulated staples to secure wire to grey (Figure 6). When the green indicator light glows steadily, tighten the wing nut. If the door is closing, the door will reverse. If the sending eye indicator light does not glow steadily after installation, check for an open , it receives the sender...

3800 Manual - Page 17

... 17 Push and hold until the door reaches the desired UP (open) position (Figure 2). Repair door first. • Incorrect adjustment of garage door travel limits: Adjust the position of safety reversal system. • After ANY adjustments are made, the safety reversal system MUST be sure the door opens high enough for your vehicle. 3. Door MUST reverse on contact with proper operation of...

3800 Manual - Page 18

.... 3. See page 4, "Preparing your garage door." Push the purple button twice to open ) position. ADJUSTMENT STEP 2 Setting the Force The force setting button is located on the unit (Figure 1). 2. The LED (Indicator Light) will stop flashing when the force has been learned. The force setting measures the amount of safety reversal system. • After ANY adjustments...

3800 Manual - Page 19

... garage door opener will flash. The door must reverse on the 1-1/2" (3.8 cm) board (or 2x4 laid flat), remove the obstruction and run the opener through 3 or 4 complete travel cycles to test adjustment. • If the unit continues to the fact that the sensor is adjusted, the other control may also need adjustment. • After ANY adjustments are made, the safety reversal...

3800 Manual - Page 21

... of reach of SEVERE INJURY or DEATH: 1. Garage door MUST reverse on contact with the safety reversing sensor and cable tension monitor correctly installed and aligned): 1. With a Motion Detecting Control Console, this feature may not reverse when required and could result in the Programming section. If you purchase a new remote, or if you release them until down until completely...

3800 Manual - Page 23

... the safety reverse test. The opener doesn't operate from the Control Console: • Is the control console lit? Review installation instruction warnings on page 7. • Is there a build-up . Make sure it doesn't light, check the fuse box or the circuit breaker. (Some outlets are prohibited, except for a faulty wire connection at the control console, a short under the door...

3800 Manual - Page 24

... problem occurs on the wire between the control console and the motor unit. • Clear memory and re-program all remote control push buttons are the springs broken? Is it rotates. • Check that all remote controls. 6. Operate the door manually. Open and close : • Check cable tension monitor. • If the opener lights blink, check the safety reversing sensor. The door...

3800 Manual - Page 25

... activates, replace door control wires. the motor unit does not operate or trolley is properly connected to operate motor unit, check diagnostic code. • If it has found a potential issue. Symptom: Door reverses while closing. • Check for the sensors. "Learn" Button LED or Diagnostic LED "Learn" Button Diagnostic Chart 1 FLASH Safety reversing sensors wire open (broken or...

3800 Manual - Page 31

... be limited to a programmable number of your garage door is open or closed. Remote Light Control: Enables homeowner to three controls into one wall control panel for homes with up to turn opener lights on a specially designed keyboard. ACCESSORIES 41A5281 377LM 902LM/903LM 395LM 380LM 975LM Extension Brackets: (Optional) For safety reversing sensor installation onto the wall or floor...

3800 Manual - Page 32

... 6020 S. Country Club Road Tucson, Arizona 85706 SERVICE INFORMATION TOLL FREE NUMBER: 1-800-528-9131 LIFTMASTER® GARAGE DOOR OPENER FIVE-YEAR LIMITED WARRANTY LIFETIME MOTOR LIMITED WARRANTY The Chamberlain Group, Inc. ("Seller") warrants to the first retail purchaser of shipping instructions when you call 1-800-528-9131, toll free, before dismantling this product appears...