Hello Bob,

I have a garage door model # 41A5021-3C that starts giving trouble since the last past weeks.The problem is the garage door opener can not be opened entirely.Every time, I try to open it by pressing the wall switch; it's lifting like 6 to 12 inches and then stops until I push the switch again to close it.

Please tell me what might be wrong with it. I am looking forward to hearing from you.

Onald