Re: 1/2 hp craftsman garage door opener won't open when...
I called Sears garage door customer service number due to the same issue. The test is to disengage the opener drive by pulling the emergency disengage handle, then open the door half way manually and then let it go. If it stays there it is a door/track/lub problem; if it drops down and closes its a garage door opener problem. Mine stayed open half way during this test so it was a door/track/lub problem. After using silicone spray on all tracks, rollers, and springs mine has been working great. Good luck.........
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It could be closing too far or the sensitivity could be set too sensitive.
Lube the springs, wd-40 rust may be the whole problem.
If the door hits and the opener continues to move until the rail flexes upward and then reverses - probably the travel adjustment.
Does the door close and stay closed if you hold the wall button down constant until it closes? - this would indicate a safety eye problem.
If the door reverses before it hits the floor or just as it hits the floor it could be the sensitivity or if the safety eyes are mounted to the track they could be flexing enough to move the eyes out of alignment.
Remove the cover and check the drive gear. It is white nylon and is just in front of the motor. It may be stripped. Take a close look at those door springs. They can sometime appear to be okay when one is broken.
There are ususally two adjustments on garage door openers...
One is for the pressure and the other is for the travel. Assuming that the travel adjustment is properly adjusted...
On a cold day things are a little tighter and it "wants" a little more downwards pressure to complete its cycle. Sorta like me in the morning -- I need a little coffee to get going on a cold morning.
Adjust the down pressure/force just enough to make the unit close properly. Do not over adjust the down pressure or you will find it won't stay closed. Sometimes the manufacturer doesn't make it too clear where this adjustment is, but you should be able to find it if you look around.
I have seen units that were installed for years all of a sudden need a little tweak of this adjustment.