Re: Garage Door Opener Repair
Most common causes for this issue are:
1 - Safety sensors are loose, dirty, or misaligned. You said you checked alignment, check that they're not loose and that they're installed properly. I had this problem recently and everything seemed fine, upon closer inspection, one of the sensors was not installed on it's bracket properly and kept wiggling loose or out of alignment.
2 - The down pressure needs to be adjusted. There should be two adjustment screws on the motor that control the amount of for to exert before tripping the "fault" and reversing.
3 - Counter balance spring is broken. Without these springs, the door is too heavy for the opener to operate. Check the springs to make sure they're not broken. Leave the repair of these springs to a professional, they are EXTREMELY DANGEROUS to handle if you are not familiar with them.
I suffer from CDO ... Its like OCD, but in alphabetical order, LIKE IT SHOULD BE!!!