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Question posted by mpotestio on December 17th, 2017

Closing Issues

I am having problems with my garage Door only closing half way. The opener opens the door to the correct height, but when I want to close the door to set the "down limit" the opener stops the Door half way and I have to use the manual Door release to close the door. Help p

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Answer #1: Posted by Odin on December 17th, 2017 8:27 AM

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Odin

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Consider fault #7 at https://www.manualslib.com/manual/26875/Chamberlain-Liftmaster-SecurityPlus-3900pld.html?page=23 and fault #13 at https://www.manualslib.com/manual/26875/Chamberlain-Liftmaster-SecurityPlus-3900pld.html?page=24. (To find the other manual sections referenced, use the search box at the top.) If the problem persists (or if you require further explanation), you'll have to obtain a walk-through from LiftMaster: use the contact information here--https://www.contacthelp.com/liftmaster/customer-service.

Hope this is useful. Please don't forget to click the Accept This Answer button if you do accept it. My aim is to provide reliable helpful answers, not just a lot of them. See https://www.helpowl.com/profile/Odin.

Related LiftMaster 3900 Manual Pages

3900PLD Manual - Page 1

... Model 3900PLD For Light Duty Commercial Use Install On Sectional Doors With Torsion Assemblies Only The Chamberlain Group, Inc. 845 Larch ... read this manual and the enclosed safety materials carefully! ■ Fasten the manual near the door after installation. ■ The door WILL NOT CLOSE unless The Protector System® and cable tension monitor are connected and properly aligned. ■...

3900PLD Manual - Page 2

...limits 17 Set the force 18 Test the safety reversal system 19 Test The Protector System 19 Test cable tension monitor 20 To open door manually 20 Operation 21-25 Operation safety instructions 21 Using your door... you to the possibility of damage to the possibility of your garage door and/or the garage door operator if you see this manual. When you do not comply with the cautionary...

3900PLD Manual - Page 3

... be used on left and right. This operator is compatible with: • Doors that there is important that use a torsion bar, springs and a door no ...no access door to the garage, as you proceed with an external emergency release mechanism. • Any gap between floor Sensor and bottom of door must ... needed to 18' (5.4 m) wide. • Doors up and down or left or right side of the ...

3900PLD Manual - Page 7

...Use a staple to secure the antenna wire to do so. 7. NEVER connect door operator to power source until pilot holes align with 14-10x1-7/8" screws. INSTALLATION STEP 1 Position the Operator NOTE: For additional mounting options see accessories page. 1. Drill 3/16" pilot holes at minimum height... torsion bar and remove the operator. Close the door completely. 2. Ensure that attach to ...

3900PLD Manual - Page 8

...NOTE: If it is fully closed. 1. Weak or broken springs or unbalanced door could result in an open door falling rapidly and/or unexpectedly. • NEVER use emergency release handle to prevent ... HARDWARE SHOWN ACTUAL SIZE Lock Screw 1/4-20 x 1/2" (2) Staples 8 Use insulated staples to the outside of the garage door track with an overhand knot. NOTE: Lock must be mounted within 10...

3900PLD Manual - Page 9

... completely when slack is not important) (Figure 3). Use insulated staples to operator. Figure 1 Operator Torsion Bar Drum Cable 2"-6" (5 cm15 cm) Cable Tension Monitor 1/8"-1/4" (3 mm-6 mm) Cable Tension Monitor Roller With Door Closed Preferred Orientation Figure 2 Wall Drum Cable Figure 3 3/4" Min. (18 mm Min.) WHT/GRN WHT/GRN Cable Tension Monitor 7/16" (11mm) Strip...

3900PLD Manual - Page 14

... down direction. The units must be installed inside the garage 14 Safety Reversing Sensor 6" (15 cm) max. If it is necessary...open position, and the operator lights will flash 10 times. above floor Either can be installed on the wall, the brackets must be securely fastened to the door operator BEFORE installing the safety reversing sensor. Be sure power is closing door: • Correctly...

3900PLD Manual - Page 16

... closing, the door will not close. If the door is required. • Loosen the sending eye wing nut and readjust, aiming directly at operator connections. • Incorrect wiring between safety reversing sensors and operator. • A broken wire. 2. Safety ReSvenrssionrg Sensor 16 Safety Reversing Sensor Sensor Invisible Light Beam Protection Area Use wing nuts to fasten...

3900PLD Manual - Page 17

... on floor. Proceed to be sure fully open ) limit and begins closing door. • NEVER learn forces or limits when door is binding or sticking. Setting the DOWN position: 5. Push the door control or programmed remote control. Black moves the door UP (open ) position. Purple Button Setting the UP position: 1. NOTE: Make sure the door opens high enough for your vehicle. 3. Repair...

3900PLD Manual - Page 18

... Button Figure 2 Push Purple button twice to open and close the door (DOWN). The door will stop flashing when the force has been programmed. The LED will close the door fully, inspect the door to enter into Force Adjustment Mode BLACK PURPLE Figure 3 18 If the garage door opener cannot open (UP). 4. If the door is not sticking or binding. The LED will...

3900PLD Manual - Page 19

... to open , place a 1-1/2" (3.8 cm) board (or a 2x4 laid flat) on the 1-1/2" (3.8 cm) board (or 2x4 laid flat), remove the obstruction and run the operator through 3 or 4 complete travel limits) is obstructed, do not operate the door. Without a properly installed safety reversal system, persons (particularly small children) could be SERIOUSLY INJURED or KILLED by a closing door. Door...

3900PLD Manual - Page 20

... INJURY or DEATH from a falling door: • If possible, use emergency release handle unless doorway is closed if possible. The door should be opened manually. • Return the door to the closed position. • Pull the emergency handle a second time. • Reconnect the door to disengage door ONLY when door is CLOSED. To reconnect the door to the operator, pull down the...

3900PLD Manual - Page 21

... the safety reversing sensor correctly installed and aligned) 1. NEVER use emergency release handle to door operator BEFORE making ANY repairs or removing covers. 13. An improperly balanced door may not reverse when required and could result in SEVERE INJURY or DEATH. 11. SAVE THESE INSTRUCTIONS. If obstructed while opening , the door will close . If the obstruction interrupts...

3900PLD Manual - Page 22

... reverse test. Once a Year • Oil door rollers, bearings and hinges. CARE OF YOUR OPERATOR MAINTENANCE SCHEDULE Once a Month • Manually operate door. The operator does not require additional lubrication. Do not grease the door tracks. 22 If it is unbalanced or binding, call a trained door systems technician. • Check to be sure door opens & closes fully.

3900PLD Manual - Page 23

...8226; See Adjustment Step 2. Close the door and use the emergency release handle to a metal door, foil backed insulation, or metal siding. 5. If this solves the problem, the single button control station is faulty (replace), or there is unbalanced or binding, call a trained door systems technician. 11. The door reverses for reference). 2. Open and close : • Check cable tension...

3900PLD Manual - Page 24

Having a Problem? (Continued) 12. Door loses limits. • Collar not tightened securely. The operator moves when the door is in operation: • Some minor movement is mounted at a right angle to disconnect the door. If not, move the position of the mounting bracket. 24 The operator won't operate due to power failure: • Use the emergency release...

3900PLD Manual - Page 25

... failure. Installed Safety Reversing Sensor Your garage door operator is overheated. Symptom: LED is properly connected to motor unit using shortened wires. Try to wall and does not move. If the sensor indicator lights do not glow steady. • Inspect sensor wires for a short (staple in wire), correct wiring polarity (black/white wires reversed...

3900PLD Manual - Page 26

The owner of the copyright in the receiver of the door operator, which provides security against code-theft devices, will be closed . To Add or Program a Hand-held Remote Control (Not Provided) Below are now erased. All previous codes are instructions for up to pry open the case as shown. To reduce risk of...

3900PLD Manual - Page 27

... (Not Provided) NOTE: The optional Keyless Entry must be programmed to close the door even after it may authorize access by pressing the new PIN, then ...motor unit lights will blink three times. To set a temporary PIN You may be used to operate your garage door operator. The door should move. USING THE "LEARN" BUTTON 1. To change an existing... no longer open the door.

3900PLD Manual - Page 30

... System: Provides backup power to the model 3900 door operator. This temporary password can add a ...opened once closed. 30 Also can be mounted below the torsion bar in their home with their door operator remote or from anywhere in the case where the torsion bar is not round or the normal mounting area is obstructed. Alternate Mounting Kit: This kit allows the operator to be limited...