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Make sure the battery is good and then locate the smart/learn button on the rear of the motor unit near where all those white wires go. Press and immediately release this button and then walk over to the keypad and key in a 4 digit code and press enter.
It could just be you need to replace the battery.
The warning light might be a "battery low" warning - advising you to replace it!
If it stops flashing, the battery has died altogether.
If you mean wireless keypad it is like this. Locate the smart/learn button on the rear of the motor unit near where all those white wires go. Press and immediately release this and then walk over to your keypad and key in your 4 digit code and press enter.
New door openers have a different radio frequency than the old models. This is most likely your problem and you will need to buy the keypad that is compatible with the new opener.
This may actually be a safety sensor problem. There should be an led light on each sensor and each should be on. Try to align them to look at one another so the infra red beam shoots between them. If both lights are off then you will need to replace the sensors or the logic board. You can test the sensors with a 9v battery. You can get replacement parts at searspartsdirect.com. Thanks BB
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