Another Garage door opener question

The door itself-
1- remove & discard the rope that was originally there for manually closing the door. It has been known to swing through the beam & trip the reverse, catch on a bracket & stall the opener, & worse yet, catch & injure or kill your favorite child or pet that happens to be there while door is operating.
2-Keep the track clean & dry- those are rollers, NOT SLIDERS. A quick shot of your favorite silicon lube, even WD40, in the roller bearing & hinges once a year is more than enough. Excess oil etc just collects dirt & gums up the works.

Of all the openers I have installed in the last 35+ years, there has been only 1 failure- power surge cooked the whole control system, but that's another story.
HTH
Willie

It worked fine for several years, then, suddenly would stop it's downward travel and reverse, probably 8 out of 10 times.

It is embarrassing to admit how long I fiddled with the "lowering force" adjustment and spring tension before noticing the loop of rope swing past the "eye".

The only thing WEIRD was why did it work for a couple of years before acting up? The rope must have stretched or twisted, all of a sudden.

You probably have four adjustments: up force, down force, up travel and down travel. Once the chain is close, you can adjust the up and down travel. If it reverses when it just touches the floor, then you either need to back off the down adjustment or increase the down force. When properly adjusted, you should be able to put a 2x4 under the door and have it reverse when it touches the 2x4.

Glenn F.

If your motion sensors check good and door operates ok manually try turning down force dial clockwise, It is typically at 1 for a single width door or 3 for a double. Increase to 5 or 7 for test purpose. As doors get older their springs weaken. If you have increased down force threshold and the door continues to reverse, the RPM sensor is the culprit. There is no way to override or test this sensor by using the hand unit or the wall control. When this sensor goes bad the door will start down and the logic board will not receive the electronic pulses and it will reverse. It is this sensor that causes the door to reverse when it runs into something. The motor stalls, the logic board doesn't receive these pulses and it reverses. This little circuit board is located at the door end of the motor shaft and every door company has them in stock. Take the cover off the unit and you will see a black cap on the end of the shaft that rotates between infrared sensors. That small circuit board is the culprit. Make sure you reinstall serrated cap so that as it turns it breaks sender receiver path on new board.