Chamberlain LA400 User Manual

Chamberlain LA400

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LA400 & LA400-S

MEDIUM DUTY SWING GATE OPERATOR

O W N E R ' S M A N U A L

Serial # Primary Arm

Serial # Secondary Arm

Serial # Control Box

Installation Date

2 YEAR WARRANTY

Radio Receiver

Built on Board

315 MHz

The LA400 is intended for use with

vehicular swing gates.

The operator can be used in Class I,

Class II and Class III applications.

Large

Metal Control

Box (XLM)

Optional

Table of Contents

Other manuals for Chamberlain LA400

Installation And Operation Manual45 pages

Owner's Manual Addendum2 pages

Questions and Answers:

F
fatkinsonJul 26, 2025
What to do if my Chamberlain Gate Opener does not run?
- J
  Jack HudsonJul 26, 2025
  If your Chamberlain Gate Opener isn't running, here are a few things to check: 1. Ensure the battery voltage is greater than 23V at the battery connection, as a low or disconnected battery could be the cause. 2. If the remote isn't programmed, see the Programming Remote instructions. 3. Check the STOP connections to ensure they are secure. 4. Clear any obstructions that might be causing a constant open command. Check the LEDs. 5. Refer to the Programming Limits instructions if the limits aren't programmed correctly. 6. If none of these steps work, the control board may be bad and require replacement.
O
othomasJul 30, 2025
What to do if Chamberlain LA400 stops?
- J
  Jeffrey JohnsonJul 30, 2025
  If your Chamberlain Gate Opener stops, here's what you should investigate: * Check the arm for any obstructions and verify that it's not bottomed out. * The RPM sensor might be faulty, requiring replacement of the arm. * Too much mA might be pulled off the board; try moving accessories to a separate power source and use the reference chart to determine the maximum mA draw for the circuit board.
R
Renee EllisAug 3, 2025
What to do if Chamberlain LA400 opens but does not close?
- B
  Barbara MooreAug 3, 2025
  If your Chamberlain Gate Opener opens but doesn't close, consider these possibilities: the battery voltage might be low (less than >23V at the battery connection), or the gate might be encountering an obstruction that needs to be cleared.
E
elizabethallenAug 7, 2025
What to do if Chamberlain LA400 Gate Opener accessory device not working properly?
- W
  whitedanielAug 7, 2025
  If an accessory device for your Chamberlain Gate Opener isn't working correctly, check the following: * Ensure the accessory is properly installed. * Verify that the enabling switch is turned on. * Check for loose or disconnected wires. * The accessory device itself might be faulty and need replacement.
K
Kelly SmithAug 12, 2025
Why Chamberlain LA400 Gate Opener stops and reverses?
- K
  Kenneth RichardsAug 12, 2025
  Your Chamberlain Gate Opener might stop and reverse due to several reasons: the gate encountered an obstruction that needs to be cleared, the force setting is too low (refer to the Force Adjustment section for guidance), there's an issue with the gate hardware needing service or replacement, or the arm wasn't installed correctly (consult the Installation section for the operator arm).
J
John Jones Jr.Aug 16, 2025
Why my Chamberlain Gate Opener motor does not run?
- S
  sullivanemmaAug 16, 2025
  If the motor on your Chamberlain Gate Opener isn't running, consider these potential causes: 1. The battery voltage might be low (less than >23V at the battery connection). 2. The cable wiring between the control box and operator arm could be disconnected or loose; check the wiring on the control board to the arm, and replace the wire if necessary. 3. The batteries might not be connected; ensure they are properly connected. 4. The motor itself could be bad, requiring replacement. 5. The control board might be faulty and need replacement.
R
richard11Aug 20, 2025
Why Chamberlain LA400 gates do not open/close in sync?
- U
  ureedAug 20, 2025
  If the gates of your Chamberlain Gate Opener are not opening or closing in sync, here are potential reasons: * A constant open command might be active; clear all open/safety devices from obstruction and check the LEDs. * The timer to close might not be set; refer to the Timer to Close section for adjustment instructions. * An accessory device might be incorrectly wired to the Open Only command; rewire the desired accessory device to the Single Button Input.

Chamberlain LA400 Specifications

General

Brand	Chamberlain
Model	LA400
Category	Gate Opener
Language	English

Summary

SAFETY

UL325 Model Classifications

Describes UL325 classes for gate operators and their applications.

Safety Installation Information

Covers critical safety guidelines for gate operator installation.

Important Safety Information (Installation & Wiring)

Key safety warnings for installation and wiring procedures.

Important Safety Information (Operation & Troubleshooting)

Safety precautions for operation and troubleshooting.

Safety Accessory Selection

Lists types of safety accessories for entrapment protection.

UL325 Entrapment Protection Requirements

WIRING

Connect Gate Operator (Gate 1) to Control Box

Steps for wiring the primary gate operator.

Set Bipart Delay (Model LA400-S Only)

Connect Gate Operator (Gate 2) to Control Box

Steps for wiring the secondary gate operator.

Connect Transformer to Control Board

Connect Batteries

ADJUSTMENT

Set DIP Switch

Configuration of the operator's DIP switches.

Limits Programming (Single Arm)

Setting gate travel limits for single arm installations.

Limits Programming (Dual Gate Left Primary)

Setting limits for dual gates with left primary operator.

Limits Programming (Dual Gate Right Primary)

Setting limits for dual gates with right primary operator.

Force Adjustment

Adjusting the gate operator's force sensitivity.

Timer-to-Close (TTC)

Configuring the automatic gate closing timer.

PROGRAMMING

Remote Controls and Keyless Entry

Programming remotes and keyless entry PINs.

Test Operator

ADDITIONAL FEATURES

DIP Switch Settings

Detailed explanation of the functions of each DIP switch.

Control Inputs

Loop Inputs

Safety Accessories for Secondary Entrapment Protection

Lists compatible safety accessories for UL325 compliance.

Photo/Edge Inputs (P6-7-8 and 9)

OPERATION AND MAINTENANCE

Reset Button Function

Maintenance Schedule

A table outlining regular maintenance tasks and frequencies.

Remote Control Operation

TROUBLESHOOTING

Basic Control Board Layout

Wiring Diagram and Diagnostic Codes

Visual wiring guide and explanation of diagnostic codes.

Troubleshooting Chart

Lists common faults, causes, and fixes for operator issues.

REPAIR PARTS

Control Box Parts

Gate Operator Arm Parts

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