Liftmaster Garage Door Goes Down Then Back Up

If your Liftmaster garage door goes down and then back up, it may be due to a number of factors. Here are a few of the most common causes:

1. Safety sensors

The safety sensors are located at the bottom of the garage door tracks. They emit a beam of light that must be broken in order for the door to close. If the sensors are misaligned or obstructed, the door will go down and then back up to prevent it from closing on a person or object.

2. Limit switches

The limit switches are located at the top and bottom of the garage door tracks. They tell the door when to stop moving. If the limit switches are out of adjustment, the door may go down too far or not far enough, causing it to go back up.

3. Motor

The motor is responsible for opening and closing the garage door. If the motor is not working properly, the door may not be able to close all the way. This can cause the door to go back up after it has started to close.

4. Circuit board

The circuit board is the brain of the garage door opener. It controls all of the functions of the opener, including the opening and closing of the door. If the circuit board is damaged, it can cause the door to behave erratically, such as going down and then back up.

5. Remote control

The remote control is used to open and close the garage door from a distance. If the remote control is not working properly, it may not be able to send the signal to the opener to close the door. This can cause the door to go down and then back up.

Troubleshooting

If your Liftmaster garage door is going down and then back up, you can try the following troubleshooting steps:

Check the safety sensors to make sure they are aligned and not obstructed.
Adjust the limit switches so that the door stops moving at the correct height.
Inspect the motor for any signs of damage or wear.
Check the circuit board for any signs of damage or loose connections.
Replace the remote control if it is not working properly.

If you have tried all of the above troubleshooting steps and the door is still not working properly, you may need to contact a qualified technician for assistance.