LiftMaster LA400 Support Question
LiftMaster LA400 Support Question
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Question posted by chadmq on July 31st, 2023
Won't Reset
settings the open and close limits and after I set one it goes back to set the other one and so on back and forth. Tried resetting and didn't work so I ordered a new reset button and problem continues. Opener is working fine with move gate button's just can't get it out of limit setting mode.
Current Answers
Answer #1: Posted by SonuKumar on July 31st, 2023 9:35 PM
SonuKumar
Member since:
May 9th, 2021 Points: 16,622,280
Member since:
May 9th, 2021 Points: 16,622,280
It sounds like your LiftMaster LA400 gate opener is stuck in limit setting mode. This can happen if the limit switches are not properly adjusted or if there is a problem with the opener's electronics.
Here are a few things you can try to fix the problem:
Check the limit switches. Make sure that the limit switches are properly adjusted. The limit switches are the small switches that tell the opener when to stop opening and closing the gate. If the limit switches are not properly adjusted, the opener will not be able to sense when to stop and will continue to cycle through the limit setting mode.
Reset the opener. You can try resetting the opener by pressing and holding the reset button for 10 seconds. This will clear the opener's memory and reset it to its factory settings.
Replace the limit switches. If the limit switches are damaged or defective, they will need to be replaced. You can purchase new limit switches from LiftMaster or a local hardware store.
Take the opener to a repair shop. If you have tried all of the above and the problem persists, you may need to take the opener to a repair shop. A qualified technician will be able to diagnose the problem and fix it.
Here are some additional tips:
Make sure that the gate is not obstructed when you are setting the limits.
Be careful not to over-tighten the limit switches. This can damage the switches and make the problem worse.
If you are not comfortable working with electrical devices, you should hire a qualified technician to set the limits for you.
I hope this helps!
Please respond to my effort to provide you with the best possible solution by using the "Acceptable Solution" and/or the "Helpful" buttons when the answer has proven to be helpful.
Regards,
Sonu
Your search handyman for all e-support needs!!
Related LiftMaster LA400 Manual Pages
LA400 Manual - Page 2
... 24 25-26 27 28 28
ADJUSTMENT
Set DIP Switch Limits Force Adjustment Timer-to-Close
PROGRAMMING
Remote Controls Keyless Entry Erase All Codes Test
ADDITIONAL FEATURES
DIP Switch Settings Control Inputs Loop Inputs Photo/Edge Inputs (P6-7-8 and 9) Safety Accessories for Secondary Entrapment Protection
OPERATION AND MAINTENANCE
Reset Button Remote Control Manual Release Maintenance
TROUBLESHOOTING...
LA400 Manual - Page 8
...
14" (35.6 cm)
10" (25.4 cm)
36.3" (92.1 cm)
RESET
6" (15.2 cm)
.475" DIA. (1.2 cm DIA.)
37.4" (95 cm)... 3R 14-18 seconds for a 90° opening 4 Minutes -20° C to + 50° C -4° F to -Open Bracket (1) • Hex Bolt 5/16"-18 ... • Warning Sign (2) • Battery (2) • Plug-in Transformer (1)
LA400-S (SECOND GATE OPERATOR ARM)
• Motor Cable - For Primary (Gate 1) ...
LA400 Manual - Page 17
...
1
gate bracket and mark new mounting holes.
1 Manually open and close the gate.
2 Ensure that the operator does not bind against the Pull-to-Open bracket.
3 Ensure that the piston does not bottom out.
2
1/2" (1.3 cm)
3
Do not allow piston to the gate post using hardware. Remove the clamp and the operator, set aside. 1
2 Drill adequate...
LA400 Manual - Page 19
... box as high as possible for best radio reception.
1 Remove screws and open the control box.
1
2 Disconnect the reset button, alarm, and coaxial connector.
3 Loosen screws to remove the control board and mounting bracket.
4 Remove the control board.
5 Remove batteries and set aside.
6 Select mounting holes and knock out using a screwdriver and hammer.
7 Secure...
LA400 Manual - Page 20
INSTALLATION » STANDARD CONTROL BOX
INSTALL THE CONTROL BOARD
NOTE: Make sure the battery leads are on the left side of the control box and not pinched.
1 Attach the antenna. 2 Reinstall the batteries, control board, alarm and reset button.
1 2
Coaxial Connector
Reset Button Connections Alarm
19
LA400 Manual - Page 21
... 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 CTRL PWR CTRL PWR
SHADOW
LOOP INPUTS
INTERRUPT CHGR OVLD CTRL...
LA400 Manual - Page 22
... 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 CTRL PWR CTRL PWR
SHADOW
LOOP INPUTS
INTERRUPT CHGR OVLD CTRL...
LA400 Manual - Page 24
...Primary gate and needs to be set as this gate.
WIRING » SET THE BIPART DELAY (MODEL LA400-S ONLY)
SET THE BIPART DELAY (MODEL LA400-S ONLY)
In some dual ...opening) must be
connected to Gate 1 connections on the same side as the primary gate (GATE 1).
1 Set the Bipart Delay to desired setting.
Connect to Gate 1 Connector on the opposite side to open first and close...
LA400 Manual - Page 26
...; JUNCTION BOX (MODEL LA400-S ONLY)
JUNCTION BOX
The following items are required to be used for the
watertight connectors.
2
3 Mount the junction box within 5 feet (1.5 m) of the junction box (not provided).
6 Secure with 3/4" NPT threaded port holes
• Screws • PVC Conduit
1
1 Open the junction box by removing screws (4) and set aside.
2 Select...
LA400 Manual - Page 31
... to move gate to blink, repeat programming.
RESET BUTTON
DIAGNOSTIC
GATE 1
SET CLOSE
5 When gate is Left-handed or Right-handed. The programming uses a combination of the control box to open position and the fully closed position, press the LEARN LIMITS button. If the problem continues, see Troubleshooting section.) Test the limits by turning the release lever clockwise 180°...
LA400 Manual - Page 32
...operator by pressing the RESET button. 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. (If the SET OPEN LIMIT LED continues to move the right operator into the OPEN position.
6 SET
CLOSE LIMIT
LE LIMITS
Press the LEARN LIMITS button.
DIAGNOSTIC
GATE 1
SET CLOSE
5 Press the GATE 2 right...
LA400 Manual - Page 33
... if there is overlap or a gate lock is now complete. (If the SET OPEN LIMIT LED continues to blink, repeat programming.
SET CLOSE LIMIT
LE LIMITS
6 Press the LEARN LIMITS
SET
SET
GATE 2
OPEN
CLOSE
button.
If the problem continues, see Troubleshooting section.) Test the limits by turning the release lever clockwise 180°, then turning the key clockwise 180°. Control...
LA400 Manual - Page 35
...Button
1 Press LEARN XMITTER button and release (LED will stop and reverse on contact with FCC Standards FOR HOME OR OFFICE USE.
THERE ARE NO OTHER USER SERVICEABLE PARTS. Operation is stopping at the OPEN and CLOSE
limits...until the learn indicator light goes out (approximately 6 seconds). PIN Number
TO ERASE ALL CODES
1 Press and hold the LEARN XMITTER button on the keypad.
For ...
LA400 Manual - Page 37
.... NOTE: All Control Inputs must be lit except when the control board goes into Sleep Mode).
RESET CONTROL INPUT
The control box has a factory installed internal reset button. This input functions to reset the alarms. This input will command the gate to OPEN / STOP / CLOSE / STOP in sequence.
NOTE: Stop jumper is added.
These terminals are intended...
LA400 Manual - Page 38
... INPUTS (P6-7-8 AND 9)
TERMINAL P6 - Order part number LA400-BOX to -Close will reverse a closing gate. OPEN SAFETY EDGE/PHOTOELECTRIC SENSOR (ENTRAPMENT)
CLOSE PHOTO
If an Open Edge device or a Retro-Reflective Photoelectric Sensor has been
connected to the open . Upon removing the obstruction, the gate will reverse a closing will continue to open or close . Activating this input with...
LA400 Manual - Page 39
...+24 Vdc
Emitter with the LA400 to control box depending on...SET OPEN
LIMIT
SET CLOSE LIMIT
LEARN LIMITS
R2Ø7
Z2Ø R227
J18 U4
R224 Z22 R92
R91 R94
R93
CLOSE EDGE
OPEN EDGE/ PHOTO
Z9 OPEN PHOTO
Z8 CLOSE PHOTO
24V
ACCESSORY
R9Ø
POWER
24V
R1Ø1
FORCE
GATE 2 TIMER RUNNING
BIPART DELAY
TIMER TO SINGLE CLOSE BUTTON
COM OVLD OVLD
OPEN...F2
SINGLE BUTTON
RESET
STOP
...
LA400 Manual - Page 40
... key counter-clockwise 180°.
3 Turn the release lever counter-clockwise 180°. Operator is made while programming the limits press the reset button to -Close feature is now engaged. 39
2
3
2
3 To set Party Mode: open position for any extended period of the remote control will stop , the alarm will sound (up to leave the gate...
LA400 Manual - Page 42
...SET OPEN
LIMIT
SET CLOSE LIMIT
LEARN LIMITS
R2Ø7
Z2Ø R227
J18
R224
U4
Z22
R92
R91 R94
R93
CLOSE EDGE
OPEN EDGE/ PHOTO
Z9 OPEN PHOTO
Z8 CLOSE PHOTO
24V
ACCESSORY
R9Ø
POWER
24V
R1Ø1
FORCE
GATE 2 TIMER RUNNING
BIPART DELAY
TIMER TO SINGLE CLOSE BUTTON
COM OVLD OVLD
OPEN... MAX
F7
C13
C4
F6 F2
SINGLE BUTTON
RESET
STOP
POWER
COM COM
SHADOW
LOOP INPUTS...
LA400 Manual - Page 43
...
19 DIAGNOSTIC
K1
Q9
SET OPEN
LIMIT
20 GATE 1
SET CLOSE LIMIT
LEARN LIMITS
R2ÿ 7
Z2ÿ R227
J18
R224
Z22 R92 U4
R91 R94
R93
CLOSE EDGE
OPEN EDGE/ PHOTO
Z9 OPEN PHOTO
Z8 CLOSE PHOTO
24V
ACCESSORY
R9ÿ...D22
MIN MAX OFF MAX
R35
D9
C12
D27 Z3
Z4
U3
OFF MAX
F7
C13
C4
SINGLE BUTTON
RESET
25
S T O P COM
POWER
COM
SHADOW
LOOP INPUTS
INTERRUPT C 1 1
CHGR OVLD ...
LA400 Manual - Page 46
...-of shipping instructions when you call 1-800-528-2806, toll free, before dismantling this limited warranty, call . THIS LIMITED WARRANTY DOES 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. The proper operation of this product is free from defect in...
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