My Liftmaster Formula 1 opener has stopped receiving signals. The wall switch operates the door, but remotes will not. Our 2nd door opener was east to program a new remote.

The motor/control unit may have gotten reset. It needs to relearn the codes transmitted by the remotes.

MIne has a "learn" button on the control unit. Press and hold, then press the button on the remote. Lights will flash indicating it has received and stored the code. Release button.

Check to see if the remote works now. If so, all three should be working. If not, dig up your manuals.

The light by the learn button may be sending a diagnostic code. See if it is flashing a number of times, pausing and then repeating. Count the flashes. Is your door stuck in the open posititon?

Make sure the light in the wall control is not blinking. If it is press and hold the lock button for 3 seconds.

I believe that inside the remote unit is a set of 10 small switches. Some of these switches are on and some are off. When you reprogrammed your opener, it looked for the code of the remote that you were using. You must change any one switch on the remote and go thru the reprogramming procedure again. After that, the one opener will only work with that specific remote.
Let me know how you do.
Gary

I have the very same problem. I have 2 Liftmaster 2500, 1/2HP openers installed in a 2 car garage. They are merely 15 feet apart in my garage ceiling. About 15months ago one stopped working by only the remotes. Went through the process of reprogramming the good one 1st and replaced batteries in the remotes, then trying to reprogram the one not working. Checked for radio interference near the one not working no LED or Halogen Lights, no wall tarnsformers, no cell phone interference etc... Nothing worked to on the 2nd
opener in trying to get the remotes working again.
I then purchased a New Logic Board, part number 41A5507-B. It was about $70 and then installed it in the 2nd opener which is not working. Tried to get the remotes programed - still nothing? I was baffled. I called Liftmaster - the only suggestion they gave me was was to totally unplug the GOOD opener and try the reprogramming up close to the 2nd door opener that's not been working. SURE enough - the Opener Remotes "Learned" okay and started working! Liftmaster Help line indicated that the thought to be GOOD opener actual had the defective Logic board and it was over powering the signal from the 2nd opener which was not working. I'll be taking the New Logic board and replacing it in the 1st opener.
Thank you Liftmaster for the help !

Your wall control is hard wired and doesn't use the receiver portion of the logic board. The remotes do. Your receiver is going bad.

It is your receiver that is bad and is part of the logic board. The remotes and keypad send a signal that the receiver uses to switch the relay that controls the motor. The wall control is wired directly and doesn't use the receiver. The key is both the remotes and keypad quit at the same time.

The remote and the keypad work through a signal sent to the receiver while the wall console, as you said it's wired directly to the opener, so it's likely that the receiver is shot. I'd try reprogramming the remote to just rule out the chance that all code wasn't erased first. (Press the learn button on the back of the operator head, stand back 5 feet and within 30 seconds slowly press the remote button a few times to see if it operates the opener). If this doesn't work, you can install an external LiftMaster universal receiver with the correct frequency and you should be good.
If there's a purple antenna hanging off the head, this is a 315 freq, use a 356LM, if black it's a 390 freq, use a 635LM receiver.
Then you'll have to reprogram your remote and keypad to the receiver.
Since there's also the issue with the light, there's also a possibility the circuit board got fried. Did you have any storms lately?

Does your wall switch have a lock feature? By pressing the lock button, the remote control is disabled. A flashing light indicates this feature has been activated.

To deactivate, press and hold the lock button for 2 seconds. The flashing should stop and your remote should work again.

The motor is probably either stalling because the door is too stiff, or you have a beam break detector that is being triggered when the door is halfway down.