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vzjpolska

08:35AM | 01/01/07
Member Since: 12/31/06
1 lifetime posts
Bvwindows
I have a Garage door opener (Sears 1/2 HP) Model # 139.18076 and number 41A5021-3E.

I have a keypad that works and 2 remotes. The remote in my car has recently started opening up my garage door and my neighbours opener.

Any ideas as to what is happening?

His remote does not open my door and he's getting tired of his door opening for no reason....thanks to me.

Billhart

09:47AM | 01/01/07
Member Since: 04/25/05
1916 lifetime posts
This number does not show up in the cross reference.

139.18076 All of them shown are of the form 139.5xxx

But the 2nd number is the number of the control board in the opener.

And that indicates that you have a newer security Plus unit with rolling codes.

http://www.aaaremotes.com/liftmastercompatibilitychart.html

This describes how the rolling codes work. It for car entry systems, but the concept is the same.

"# The transmitter's controller chip has a memory location that holds the current 40-bit code. When you push a button on your key fob, it sends that 40-bit code along with a function code that tells the car what you want to do (lock the doors, unlock the doors, open the trunk, etc.).

# The receiver's controller chip also has a memory location that holds the current 40-bit code. If the receiver gets the 40-bit code it expects, then it performs the requested function. If not, it does nothing.

# Both the transmitter and the receiver use the same pseudo-random number generator. When the transmitter sends a 40-bit code, it uses the pseudo-random number generator to pick a new code, which it stores in memory. On the other end, when the receiver receives a valid code, it uses the same pseudo-random number generator to pick a new one. In this way, the transmitter and the receiver are synchronized. The receiver only opens the door if it receives the code it expects.

# If you are a mile away from your car and accidentally push the button on the transmitter, the transmitter and receiver are no longer synchronized. The receiver solves this problem by accepting any of the next 256 possible valid codes in the pseudo-random number sequence. This way, you (or your three-year-old child) could "accidentally" push a button on the transmitter up to 256 times and it would be okay -- the receiver would still accept the transmission and perform the requested function. However, if you accidentally push the button 257 times, the receiver will totally ignore your transmitter. It won't work anymore."

http://auto.howstuffworks.com/remote-entry2.htm

I an guessing that you remote is withing the +256 codes of the other unit.

Try this.

Remove the battery from your remote for 24 hours. While it is out hold the button down for 1 minute.

Hopefully that will reset the code in YOUR remote.

Then replace the battery. You will need to reprogram you opener to accept the new code from your remote.

If your other remotes don't work then do an erase of all codes in your unit and then reprogram the unit to accept them. Remember that the keypad is another remote.

If that does not work then have your neighbor do an erase on his unit and reporgram in his remotes.

That is assuming that he has a Sears/Chamberlain/Liftmaster with Security Plus.

If not what is the make and model number?
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