Chamberlain hd920ev help?

Our chamberlain 1150lm garage door opener is opening and closing on its' own throughout the day and night. How do I clear the existing codes on the unit and reprogram the remotes to a new code?

Is this a legit school and will a degree from them be accepted?

Has no power at all. The outlet is good (120V)

Pushing the remote or the wall switch will open the door approximately 18" and then it stops. I have taken several steps to troubleshoot the unit. 1. Disconnect the trolley using the rope pull, same result. 2. Adjusted upforce to the maximum, same result. 3. Adjusted up travel, same...

When we had an electrical Storm and I opened my garage door on the next day, they door went open but would not close again. I have electristity in the Garage, just the opener will not work anymore. I have a Chamberlain whisper Drive 1/2 H. P. Could someone please tell me what to do with that,...