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LiftMaster LA400 Support Question

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Question posted by emadxnick on July 31st, 2021

Gate Opener Stuck On Stop.

Old liftmaster gate opener LA4000 have power but stop light is on and can't get it to work?Diagnostic lights blinks every one second.Any idea

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Answer #1: Posted by SonuKumar on August 1st, 2021 9:54 AM

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SonuKumar

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How do you reset a gate sensor?

Disconnect all power, wait 15 seconds, then reconnect power (reboot). If issue continues, replace main control board." Depending on the display number indicated, the solution prescribed will vary.

https://www.youtube.com/watch?v=r7kI0WtkwUQ

https://www.youtube.com/watch?v=UKZ4VFr3bcQ+9

What do you do if your automatic gate won't open?

You should check and replace the batteries and try again. If the problem is not solved, then replacing the remote is the only solution. Automatic gates operate by using sensors that trigger motion. However, your gate will fail to open if the sensors are blocked.

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Related LiftMaster LA400 Manual Pages

LA400 Manual - Page 2

...-Open) Attach Brackets to Gate Operator Determine Mounting Location Measuring and Marking for the Gate Bracket Position Gate Operator on Gate Test Gate Travel Secure Post Bracket to Gate Post Secure Gate Bracket to Gate Warning Sign Placement Standard Control Box Large Metal Control Box (XLM) WIRING Connect the Gate Operator (Gate 1) to the Control Box Set the Bipart Delay (Model LA400...

LA400 Manual - Page 3

... the open and close directions of the gate within the operator. COMMERCIAL/GENERAL ACCESS VEHICULAR GATE OPERATOR II A vehicular gate operator (or system) intended for use on a single-family residence (UL325 Class I - SAFETY ACCESSORY SELECTION All UL325 compliant LiftMaster gate operators will accept external entrapment protection devices to four single family dwellings, or a garage or...

LA400 Manual - Page 4

...gate or barrier. 12. Locate the gate such that transmits radio frequency (RF) signals to the gate operator for the construction and the usage class of application. The Stop... the gate and adjacent structures when opening . b. Pedestrians must be properly installed and work freely in the open into account the possible hazards associated with a separate access opening and closing...

LA400 Manual - Page 5

... (1.83 m) 3.1.5 All gates shall be designed with sufficient lateral stability to the designed fully open position or the 1.2 Gates shall be designed, constructed ...Gate Construction. Exceptions. 3.2.2 Positive stops shall be required to limit travel to ASTM F2200 for panel types. 1.5 An existing gate latch shall be disabled when a manually operated gate is retrofitted with a powered gate...

LA400 Manual - Page 8

...• Plug-in Transformer (1) LA400-S (SECOND GATE OPERATOR ARM) • Motor ...Power Consumption: Battery Charger Supply: Maximum Gate Width: Maximum Gate Weight: Protection Class: Travel Speed: Rated Operating Time: Temperature: Main Supply (Control) Dedicated Circuit: Absorbed Power...except for a 90° opening 4 Minutes -20° C to + 50° C -4° F to -Open Bracket (1) • Hex...

LA400 Manual - Page 13

... is not assembled correctly you will require. 1 LEFT-HAND GATE RIGHT-HAND GATE 12 NOTE: If the Pull-to-Open bracket is now in manual mode. SEE ACCESSORIES) The Push-to-Open bracket can be assembled to work on a Left-Hand or a Right-Hand gate. 1 Review the gate types and select the type of installation you will...

LA400 Manual - Page 21

...5 feet (1.5 m) of the control box for best radio reception. 1 Open the control box. The control box door may be mounted to a post with #12 copper wire to one of ...OPEN EDGE/ PHOTO OPEN PHOTO CLOSE PHOTO ACCESSORY POWER 12 V BR GR WH YL BL RD GATE 2 FORCE GATE 2 ON OFF AUTO OPEN LOW BATT OFF MAX SINGLE BUTTON TIMER TO CLOSE OPEN CONTROL INPUTS SINGLE BUTTON OFF MAX RESET STOP...

LA400 Manual - Page 22

... ACCESSORY POWER 12 V BR GR WH YL BL RD GATE 2 LEARN XMITTER ON OFF LOCK / BIPA RT DELAY CLOSE EDGE OPEN EDGE/ PHOTO OPEN PHOTO SET OPEN LIMIT GATE 1 CLOSE PHOTO SET CLOSE LIMIT LEARN LIMITS FORCE GATE 2 ON OFF AUTO OPEN LOW BATT OFF MAX SINGLE BUTTON TIMER TO CLOSE OPEN CONTROL INPUTS SINGLE BUTTON RESET OFF MAX STOP...

LA400 Manual - Page 29

ALARM MAGLOCK Z1 GATE 1 ACCESSORY POWER GATE 2 R4 J4 FUSE FUOSPEEN OPEN D15 C2 MOV2 Control Box R4 C2 J4 24 VAC/ SOLAR INPUT Ground Screw 12 Gauge...For proper operation, do not connect the earth ground rod to the green screw on the outlet plate. Ensure the power wiring ground connection remains securely connected to the green screw on the outlet plate. 1 Install earth ground rod within ...

LA400 Manual - Page 31

... D4 D2 RESET BUTTON 4 Press the Gate 1 right button to move gate to the desired OPEN position. DIAGNOSTIC GATE 1 SET CLOSE OR SINGLE ARM RIGHT-HAND SIDE PROGRAM OPEN 3 Press the LEARN LIMITS button (SET OPEN LIMIT LED will blink). PROGRAM CLOSE 6 Press the Gate 1 left button to move gate to the desired CLOSED position. DIAGNOSTIC GATE 1 SET CLOSE PROGRAM CLOSE 6 When...

LA400 Manual - Page 32

... Press the LEARN LIMITS button. DIAGNOSTIC GATE 1 SET CLOSE 5 Press the GATE 2 right button to close the right operator. DIAGNOSTIC GATE 1 SET CLOSE 9 Press the LEARN LIMITS button. Control board SET SET GATE 2 will blink). SET OPEN LIMIT SET CLOSE LIMIT The control board beeps and the SET OPEN LIMIT and SET CLOSE LIMIT LEDs stop blinking, programming is now complete...

LA400 Manual - Page 33

... 6 Press the LEARN LIMITS SET SET GATE 2 OPEN CLOSE button. OPEN LIMIT SET CLOSE LIMIT FORCE SET CLOSE The control board beeps and the SET OPEN LIMIT and SET CLOSE LIMIT LEDs stop blinking, programming is overlapping must be set as the primary gate (GATE 1). • If one gate is overlapping the other gate; ADJUSTMENT » LIMITS LIMITS NOTES: •...

LA400 Manual - Page 34

...; NEVER use force adjustments to compensate for every second of the gate it may be necessary to activate and close the gate. Gate MUST reverse on the control board, open and then close the gate. 2 If the gate stops or reverses before reaching the fully open for the timer feature to make force adjustments. FORCE ADJUSTMENT The operator...

LA400 Manual - Page 38

... 9) TERMINAL P6 - It will pause an opening gate for 2 seconds C2 then stop. OPEN SAFETY EDGE/PHOTOELECTRIC SENSOR (ENTRAPMENT) CLOSE PHOTO If an Open Edge device or a Retro-Reflective Photoelectric Sensor has... part number LA400-BOX to Terminal P8 while the gate is opening will have no effect. Activating this input while the gate is closing will reverse an opening gate until the...

LA400 Manual - Page 39

... Emitter with the LA400 to control box depending on wire gauge and distance - 300 mA accessory power, 75 mA switched accessory power. PIN:G65ME120C5) Miller... NC EDGE 2 F3 NO NC PHOTO S1 K2 DIAGNOSTIC GATE 1 K1 Q9 SET OPEN LIMIT SET CLOSE LIMIT LEARN LIMITS R2Ø7 Z2Ø... C13 C4 F6 F2 SINGLE BUTTON RESET STOP POWER COM COM SHADOW LOOP INPUTS INTERRUPT CHGR OVLD COM...

LA400 Manual - Page 42

... MAGLOCK LEARN R1 XMITTER SINGLE NO DUAL MODE NC EDGE 2 F3 NO NC PHOTO S1 K2 DIAGNOSTIC GATE 1 K1 Q9 SET OPEN LIMIT SET CLOSE LIMIT LEARN LIMITS R2Ø7 Z2Ø R227 J18 R224 U4 Z22 R92 R91 R94... D27 Z3 Z4 U3 C11 OFF MAX F7 C13 C4 F6 F2 SINGLE BUTTON RESET STOP POWER COM COM SHADOW LOOP INPUTS INTERRUPT CHGR OVLD COM F1 20A 32V MOV1 JMPR2 DB1 C64 U2...

LA400 Manual - Page 44

... Relays "click" when radio or SBC signal is given. GATE STOPS Gate starts to any commands. Voltage must be >23 V at battery connection. See Programming Remote instructions. See Force Adjustment section. See Installation section of accessory. Replace arm. Clear gate from obstruction. Clear all Open/Safety devices from obstruction. See Timer-to -Close section for...

LA400 Manual - Page 46

...NOT COVER ANY PROBLEMS WITH, OR RELATING TO, THE GARAGE DOOR OR GARAGE DOOR HARDWARE, INCLUDING BUT NOT LIMITED TO THE DOOR SPRINGS, DOOR ROLLERS, DOOR ALIGNMENT OR HINGES. IN NO EVENT SHALL SELLER'S ...INSTALLATION AND SERVICE INFORMATION, CALL OUR TOLL FREE NUMBER 1-800-528-2806 www.liftmaster.com WHEN ORDERING REPAIR PARTS PLEASE SUPPLY THE FOLLOWING INFORMATION: PART NUMBER DESCRIPTION MODEL...

LA400 Manual - Page 47

... Used toOPEN allow for free exit only. Fail safe operation keeps gate locked if power is 45 feet (13.7 m) 24 V. GC824-12 3-Button Mini-Remote Control with gate, providing for a Open, Close, Stop command of remote controls. To order visit www.liftmaster.com 46 OPEN LM202 02101 OPEN OPEN OPEN 370LM 1-Button Station: Steel enclosure wired station will allow the...

LA400 Push to Open Addendum Manual - Page 2

... the control board. 9. Figure 4 Figure 5 Figure 6 Post Bracket Assembly C Clamp Operator MUST be used. 8. Disconnect power to cross member, using C clamp. With gate open and operator in Open Position LEVEL Horizontal Cross Member Mark cross member through middle of gate bracket slots and drill 11/32" holes Mark fence post through middle of all quick...