liftmaster Recent Questions, Troubleshooting Help & Support

This is such a low information and general question I doubt my answer will be accurate but if we assume you mean it won't open using a remote but will open by pushing the button on the operator board, we can then assume you have an issue with either the transmitter or the receiver. The transmitter, also known as a remote or clicker, may have a dead battery or if it uses dip switches, someone changed them. It could also simply have gone bad. If you have a receiver with a learn button, you may need to reprogram the transmitter. You will need to find out what kind of receiver you have first, then follow the instructions on it to reprogram the remote. You can find the receiver by looking for the antenna. Follow this to a box, usually about the size of two packs of cigarettes. Look on the back for a model name and number and do a search for the manual. If it is a dip switch type, make sure the dip switches on the transmitter and the receiver are in the exact same position. You might want to follow up your original post with pictures of the receiver and transmitter. This will help determine the next step.

Garage Door Opener Troubleshooting step by step This video may assist you

You have a bad main board. I have encountered this recently while repairing an la400. I am a gate operator installation tech.

first, hold the wall button down and do not let up and the door will close for you. second, one of the wires to your sensors is loose, broken or shorted out by a staple thru the insulation. you can bypass the sensors on a temporary basis while you find the issue, by jumping the sensor connections at the motor.

bearings are bad

It could be the garage door motor that is acting up. Try closing it with the button in the garage. If that's not the case, you may need a different garage door opener.

Hi Laura: Mine does this too. I just thought that it was supposed to do this as it made sense to me. The light automatically turns off after a few minutes, so if the sensor indicates that someone is walking in and out while the door is open, the light stays on. I'm thinking........... It ain't broke..... don't fix it.

check all wires,someone may have cut them to break in

That is the quickest way to get one that works.

The most likely cause of this problem is that the door is unexpectedly hitting the ground before the shut off of the motor. It is possible that the door is also jamming which makes the unit think there is an obstruction. If there is no mechanical problem with the door itself, you can make adjustments to the up/down force and the up/down limits. These adjustments are at your lifter motor unit and you should check or download your particular manual. I have linked a video showing the basics for this adjustment.https://www.youtube.com/watch?v=GebkW96Sd_c

Sounds like the opener has opened to far and the trolley is now jammed against the stop bolt.

all it is is the motor that needs replacing save urself some money and check inside for the model number of the motor and order a new one for around 50 dollars beleive it or not there are probably 20 to 30 things that use the same motor

The opener is closing too far. On the side of the opener, you should see 2 white knobs, recessed into the side. Using a flat blade screw driver, adjust the close knob (closest to the door side of the opener), anti-clockwise until the door will close gently on the floor.

If it's just off a little you can adjust the limits. If it's off alot you need to take the gear set back out and set the belt / chain / screw to the closed position. run the operator to the closed position and then install the gear set.

If you go to liftmaster.com they have a chart that will tell you all accessories that will work with your system.

I have the same problem. Door does not open or close when press the push button and/or transmitter. The light flashes 5 times. Manually open or close the door is ok. On the manual troubleshoot, it says it's either the opener is overheated or it's on vocation mode. I don't know how to switch of vocation mode. Is it possible the thermal sensor is broken?
Can someone help?