VIDEO: Setting the Limits on a Guardian DC Operator

This video will show you how to set the travel and force limits on your Guardian model 615, 628, or 600SL. Click on the link below.

Qestions?: Call Guardian tech service 1-424-272-6998.

  1. Nic Yiallouris's picture
    Aug 21, 2023

    My 628 beeps 5x, prompting limit programming, but when I push the limit button, the up light doesn't stay green. It flashes green for a second, then goes off.

    I tried pushing the up button after hitting the limit but it doesnt move the door. I think this has something to do with the light not staying on.

    Is there something else I should try ?

  1. Brian's picture
    Oct 29, 2023

    5-beeps means the operator has lost its program.  Follow the programming steps in the manual.

  1. Susan's picture
    Sep 15, 2022

    It closes partially, then goes back up and beeps 20 times.

  1. Brian's picture
    Sep 15, 2022


    20 beeps indicates a photo-eye obstruction.  Check the alignment of the photo-eyes.  Make sure LEDs on the eyes glow sold green and solid red.

  1. Eugene TRAMMELL's picture
    Sep 28, 2021

    my Guardian beeps 25 times and stops before it completely opens

  1. Brian's picture
    Sep 29, 2021


    25 beeps indicates that the operator has detected an obstruction.  

    1. Disconnect the door from the opener by pulling down on the red handle (safety release).

    2. Move the door up and down.  It should move smoothly and should not bind at any point.  Check the track for any debris that may be sensed as an obstruction.  If there is binding, call a professional to fix the door.

    3.  Move the door to a mid-way open position.  The door should remain in this position.  If not, there could be a problem with the door spring.  Check to see if the spring has fractured.  If yes, call a professional to replace it.

    4.  Normal aging and wear and tear can effect the force needed to open or close the door.  Reset the limits and auto learn force.  The directions for this procedure can be found in the manual or in the video above.

    5.  Call the Guardian Tech Service at 424-272-6998 if more troubleshooting help is needed.

  1. Brian's picture
    Feb 18, 2021

    Hi Abdool,

    Please call 424-272-6998 for troubleshooting assistance.  thanks

  1. abdool's picture
    Feb 16, 2021

    The device works without a remote control and the battery was changed and did not receive the signal from the remote. Previously, this happened and the amator was hit with a light blow with a screwdriver and started working again, then stopped receiving the remote signal again

  1. Brian's picture
    Sep 18, 2020

    Hi Carl,

    12-beeps could indicate a stuck relay on the cirscuit board.  Call 424-272-6998 for troubleshooting help.

  1. Carl Chang's picture
    Sep 17, 2020

    I think the stuck relay in the circuit board has problems, Open the garage is OK, but stuck and beep 12 times trying to go down for the 3rd. times.

  1. Brian's picture
    May 03, 2020

    Hi Brad,

    It could be a stuck relay on the cirscuit board.  Call 424-272-6998 for troubleshooting help.

  1. Brad Thumudo's picture
    May 01, 2020

    checked the sensors and solid green and solid red on the sensors but the door still won't close. When I push the close button it just beeps 12 times. Not sure what else it could be.

  1. Brian's picture
    Dec 11, 2019

    Hi Nick,

    It may be a stuck down relay.  Please call 424-272-6998 for assistance.  Thanks

  1. Nick's picture
    Dec 05, 2019

    My garage door started giving me the sound that something is in its path so I double checked and I had both a steady red and green light, I went ahead and reset the settings I was able to program the up force but whenever I try to program the down limit as soon as I hold down the opener starts beeping again as if there is something in the way, and again there are no obstructions and I still have a steady green and red light on my sensor.

  1. Brian's picture
    Oct 06, 2019

    Hi Karolos,

    Please call Guardian tech service, 424-272-6998, from 7AM-7PM CDT.  Locate the serial number of the operator (barcode label on the steel chassis above the control buttons) prior to speaking with the technician and provide him with that number.   A new circuit board may be required.

  1. Karolos Grigoriadis 's picture
    Oct 05, 2019

    Have Guardian 600sl less than a year. A few weeks ago started beeping 12 times and not open it close. The installer told me that it indicates a stuck motor and to shake or tap the motor to unstuck. It worked a few times but now it is happening almost every day and gets harder and harder to unstuck. Very unhappy with the product!!

  1. Brian's picture
    Sep 30, 2019

    Hi Pam,

    5 beeps indicates that the operator has lost its programming.  This may have occured due to a power surge or similar event.  Follow the steps in the owner's manual or call 424-272-6998 for tech service help to reprogam the operator.

  1. Brian's picture
    Sep 30, 2019


    5 beeps indicates that the operator has lost its programming.  This may have occured due to a power surge or similar event.  Follow the steps in the owner's manual or call 424-272-6998 for tech service help to reprogam the operator.

  1. Michael Mitchell's picture
    Sep 26, 2019

    My garage door opener will not open or close. It beeps 5 times with light on steady

  1. Pam's picture
    Sep 16, 2019

    Hi there I have a guardian 600sl it’s just a year old . It beeps 5 times but will not go up or down>
    Please help!

  1. Brian's picture
    Jul 08, 2019

    Please call 424-272-6998 for troubleshooting assistance.

  1. Brian's picture
    Jul 01, 2019

    Hi Jonathan,

    The garage door opener will not go down, because it does not sense working photo-eyes.

    When functioning normally, one photo-eye will have a solid red LED and the other a solid green LED.  If blocked or misaligned, the green LED will flash and the red LED will turn off.  First check the alignment of the eyes.  You may need to remove one of the photo-eyes from its bracket.  Move the eye until there is a solid red LED and solid green LED illuminating.  If PE continuity can't be found, no matter which direction the eye has been pointed, follow the steps in this guide

  1. Jonathan Nguyen's picture
    Jul 15, 2019

    Hi Brian,

    Using the provided information I was able resolved the problem with the garage door will not close. Thanks so much for your advise and support.

  1. Jonathan 's picture
    Jun 30, 2019

    I am using Guardian Model 600SL, I checked both photo-eyes based upon your instruction. If the eye is covered the red LED is of but the green LED is flashing, How do know if the signal reached the logic board. At this time the garage open is beep 5 times indicated that Up/Down limited is not set and I wateched the video how to set the limit. I can move up but not down. The motor will not move the belt to down direction but it'll move up. Is the position encoder is bad of the circuit board?
    Please help. Thanks,

  1. Brian's picture
    May 07, 2019


    A door will not close without function photo-eyes.  Please check to see whether there is a solid green LED shiming on one eye and solid red LED on the the otther.  Loosen the adjustment screw and move one of the eyes until both LEDs are illumunated.  If this does not work, please call Guardian tech service at 424-272-6998.

  1. Aaron's picture
    May 05, 2019

    I am trying to reset everything and trying to troubleshoot the garage motor but it wont work. I've already tried everything and it only works when I release the latch and lower the door manually. After doing that I go and lower the chain manually using the controller on the motor to place the grip on the latch and then I do the limit option to try and get the door up but when it's up it wont go down.. need help!!!

  1. Brian's picture
    Mar 29, 2019

    Hi Rattana,

    Please call 424-727-6998 for tech service.  A trained tech will walk you through some solutions.

  1. rattana's picture
    Mar 13, 2019

    my 600sl beeps 12x when trying to open garage door. after troubleshooting and unplugging the unit, i get 5x flashes. which prompts me to set the limits. however in attempting to set the limits. it stops and starts beeping 12x again. help!!

  1. Ron H's picture
    Jul 07, 2019

    Did you have any luck fixing this. I am also receiving the 12 beeps when trying to set the limits.

  1. Mary Prentice's picture
    Apr 08, 2018

    Need to reset the limits on door for 600

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