My Craftsman Garage Door Opener only travels for 1 second then reverses after replacing the gear assembly. Is there a start from scratch procedure I could try to reset the position to?
I have read the answers to similar questions on this post. I cannot seem to get the up/down travel limit switches "reset" to make the full travel cycle. I have removed the chain from the sprocket just to eliminate any possible variable with the door or track. From an answer by MM_Expert, I removed the gear driving the limit switch and manually positioned it to just touch the UP limit. Result is that when activated, the limit starts the downward travel and then stops after about 1 second and reverses back to the UP limit. I've tried the same process and moving the limit down to just touching the DOWN limit. Result is that it hesitates and then moves toward the UP direction but only for about 1 second. The rpm sensor black cap seems to be in the right position and operating properly. I just can 't see any reason why it would stop on the way down before hitting the DOWN limit.
Jimmy k
Expert
There is not a "start from scratch position". You have done all you can with setting the limit switch.
You didn't send a model number so I might be sending you some wrong information. I think the door safety sensors are causing your problem. If the garage door will close when you hold the wall control button in, and the remotes only make the door go down a few inches and return, the problem is in the door safety sensor circuit. Look at the led's on the door sensors. If one or both leds is blinking, the sensors are misaligned. If one of the leds is not on, the door sensors need to be replaced.If the led's on both sensors are off the problem is in the logic board or the sensor wiring. You need to look closely at the wiring to the sensors to see if it is broken or pinched by a staple. You can test the wires with an ohm meter for continuity or two wires shorted together. If the wires seem ok, remove the sensor wires removed from the terminals on the logic board and check for voltage across terminals 2 and 3 on the logic board. You should have 4-5 volts dc. If you don't have 4-5 volts between terminals 2 and 3 and the opener is plugged in, the logic board is bad.If you have 4-5 volts at terminals 2 and 3, and the wiring is ok, replace the door sensors.I am sending you an image with the codes for flashing led's. If your led is flashing a code, this will help you know where to look. Make sure you have the door sensor wires connected with the 2 black wires together and the 2 black with a white tracer wires together. The wires go on terminals 2 and 3, it doesn't matter which goes where.
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