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Our Liftmaster 520 LM wireless remote receiver will not open our garage door. It is a commercial setup and the door next to it opens when the receiver button on the adjacent door opens it. I don't think it is a remote problems because the remote lights up fine but when you push the receiver button (it is supposed to open the door) it doesn't. Any suggestions?

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  • 5 Answers

You have to program it to the garage you want it to open. There are codes that the remote and garage opener have and they must be insink.

Posted on Nov 16, 2014

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Posted on Jan 02, 2017

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SOURCE: Liftmaster Garage Door Opener Problems...

The problem lies in the RPM sensor, most likely due to the interrupter cup assembly. The interrupter cup assembly is the black cap that runs through the RPM sensor. You may have forgotten to re-attach this piece or it is probably moving too far out when the garage sets in motion. To fix this, remove the cup assembly, unscrew the two screws on the top metal piece with a 1/8 allen wrench, push the metal piece as far in as possible and put the screws back on. This will give more room for the cup assembly to spin and be read by the RPM sensor. Hope this helps!

Posted on Jul 10, 2008

  • 3197 Answers

SOURCE: Liftmaster wireless keypad closes but won't open the door

If you are sure the battery is good you have a bad keypad. The signal strength is so weak it will not penetrate the door.

Posted on Aug 25, 2009

  • 3197 Answers

SOURCE: garage door opens a few inches and stops

On the rear of the motor unit near where all those white wires go you will find the 'up force'. Increase this 1/4 turn and try.

Posted on Dec 07, 2009

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sounds like condensation in the receiver window of the garage unit rather than the remotes. Try running a hair dryer over the area where the signal is received to get rid of any moisture and try using the remote from across the road or at the drive entrance.to check your success

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If you have the owners manual, it should explain how to setup the remotes again. If not, you can go online and see if Sears has the manual on the web.

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