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I have an old Craftsman door opener That has been opening on it's own and have looked at all the possible causes and no fixes seem to work. I removed wires from the wall mounted opener so it isn't a wiring issue. The door opened while the remote was gone in the car so it doesn't look like a remote problem plus it's new. I thought maybe it was a radio frequency issue so when trying to reset the codes by pushing and holding the SR code button the led won't go out no matter how long the button is held down so the existing codes can't be erased. So looking to see if this door opener can be reset by some other method.

I removed the wires at the opener itself so that shoul eliminate the wiring. The SR code button is yellow and the original remotes are long gone so no numbers from there. My opener doesn't have the photo sensors and uses force or torque settings for safety reverse. I have changed the plastic worm gears so it looks like it's time for a replacement seeing as that I can't reset the codes. I noticed the front sticker doesn't have a model number at all and the only number is 41A3625 which is on a sticker by the SR button. The original manual I have is for a Model 139.18616sr 1/2 Hp.

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    Are you following the instructions carefully? Post a picture of the opener and the remote. For a long time, Sears color coded the remotes. The color code will indicate which generation the opener is from. Finally, the plastic gears inside only last 10-15 years anyway, maybe it is time for a new opener. – Mattman944 Sep 18 '19 at 9:10
  • Have you checked the wiring for the sensors?? – JACK Sep 18 '19 at 12:13
  • As I understand it, the color coding is the programming button on the back of the unit itself that says what kinds of remotes it works with. I have one that's Red and one that's Purple, I have to buy remotes that claim to be compatible with those colors. "It's not a wiring issue" Did you remove the wires from the button or from the unit? It's possible there's an intermittent in between (mice are good for that sort of thing.) – Duston Sep 18 '19 at 13:53
  • My personal experience with garage door openers suggests strongly that when an "old" one acts up, replacement is often the least troublesome option. And when you replace it, put a surge suppressor on the outlet it plugs into (processing for the remote & safety features mean there's a little computer in there, and odd stuff (sometimes very odd stuff) happens when they get partially fried, but not so fried that the whole thing acts dead.) – Ecnerwal Sep 18 '19 at 16:13
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The most common cause of the door reopening is that one of the door limit switches is dirty or misadjusted. There are different switches to detect door travel and to sense the torque applied by the motor. The example below shows the switch that closes just before that door reaches the bottom of travel.

Door-limit switch

The two limit switches are at the end of the support rail. Try cleaning switch contacts, which get greasy from the rail lubricant. This is easy to do since contacts are exposed on many Craftsman door openers (not a hazard, since only 24 VAC at low current is used). Use automobile brake spray cleaner or other nonflammable, non-toxic (or only mildly toxic), solvent. The contacts are just below the end of the wire. If the door is open, you can clean between the leaves of the contacts with a cotton applicator -- being sure to remove any lint.

If that doesn't resolve the issue, loosen the switch from the rail and adjust forward or backward until the door closes properly and stays shut.

The purpose of the bottom switch is to sense the last few cm of door travel. The torque-sensing switch in the motor housing reverses door-travel direction if an obstacle is encountered, such as a child's foot on the door sill. However, the door must close with enough force to make a tight seal, preventing bugs and drafts from entering, so the bottom limit switch disables motor reversal as the door touches the sill. If that switch fails to close, the door reacts as if an obstacle caused it to reverse... sometimes, after a delay of a few seconds.

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