Garage door wont close, Stops and Reverses, Voltage Test.

My garage door is not working correctly and closing only when I’m holding the control button down. When I release it, the door stops and reverses, and won’t close. The garage light flashes 10 times. How to troubleshoot voltage, and fix garage opener safety sensors if there is no orange and green light on LiftMaster by Chamberlain. If the green light is blinking, align sensors or remove any obstructions.

[changeizfitness]

Oh goodness, I can’t thank you enough. I’ve watched several videos, but none of them talked about checking the wires. You saved me from spending money I don’t have.

[kfliuot]

Best video I have seen on this subject. Mainly due to the accurate description of the normal voltage that should be seen for this circuit. 6 vdc. Nowhere else did anyone give this spec. Yes the transformer in the unit is 24 vac. That has nothing to do with this safety circuit. Thank you for giving me the answers I looked hours to get. I can finally assume my logic board is Ok.

[timeandplace]

Thank you. Thank You and YouTube. I am 78 and with your excellent instructions and information I fixed my garage door problem and learned how to avoid future problems. I am so proud of myself and thankful to my mother that taught me to "try before paying you might learn something for a lifetime". I subscribed and will share with family and friends. I like your handle "YOURSELF" 🙂

[mericemir]

I just watch your videos and I had same problem and find out my left sensor was fal of from and put it back and exactly what you were saying and fixed the problem thank you so much save me a lot of money from calling technician

[boliu]

Thanks. Finally SOMEONE actually said what the DC voltage should be. The sensors must communicate back to the main unit via RF....very very helpfull

[jim]

Thanks a lot for the video! This is the only place in the universe that states the actual voltage supplied to the photocell circuit.

[romanykemp]

Thanks. Finally SOMEONE actually said what the DC voltage should be. The sensors must communicate back to the main unit via RF...

[matthewdavar]

Excellent tip. Thank you very much. If knew this, I would not replace my sensors which did not solve my problem.

[davyrwhite]

Sensor out of alignment, as well. Thanks for going through the troubleshooting steps back to the power source. A lot more help than the manual or the online chatbot. Thanks for this!

[eltodd]

Thank you so much. I've been trying so hard to find this information and you have it all on this video thank you so much. Now I know what my problem is

[skudapa]

It saved my day, not able to fix my garage with the same problem, on my way back I searched for the solution, I found this video, took u turn and it worked perfectly

[barbeerw]

Thank you! My door was closing most of the way then reversing. I didn’t realize (or remember, in case I already knew it) about the light flashing code. Mine was flashing ten times, like you mentioned.
There wasn’t any obvious obstruction between the two door sensors but the green one was flashing intermittently. Turns out that the garage door insulation that I installed years ago was puffing out just enough to be detected by the sensor.
I pushed it in and problem solved. I’ve added some Tyvek tape to help prevent it from bulging back out again.
Thanks again for steering me in the right direction!

[jeromepancoast]

Your video was very helpful. I needed the voltage at the sensors and I could NOT find it on any other video. Much easier to know the voltage and not have to remove the sensors and run jumper wires to the back of the motor unit.

[patcassidy]

Good explanation. Only video I've seen showing the voltage needed to operate sensors.

[DaBIGTOE]

did not know where to start diagnosing a garage door since ive never done it, gonna give this a try thank you!

[kuduman]

Great guidance. Clear and concise. Worked for me - one sensor (receiver) was out of alignment. Thanks!!

[squirrelattackspidy]

My door goes down to about a foot of closing and then reverses direction. Going to go through your troubleshooting tips. Thank you for the detailed explanation!

[brushenas]

That was great. you saved my day. Thank you very much. I cleaned the sensors and it is closing properly now.

[marcmora]

Thanks for the tips! Helped me diagnose my issue and opener now functions properly.

[numbachikacazh]

Thank you! Your video helped me today with sensor issue!