The latest garage door remote controls use a code-based system where the codes between the remote control and the doors change with each use. This is distinct from older code-based systems that were keyed with codes -- the keys (switches) on the door remained the same and you keyed each remote to match the door. The newer system is more secure because the system randomly accesses billions of new codes. You can replace a lost garage door opener if you know which type you have.
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Open the access cover on the garage door motor and see if the system uses keyed codes by looking for a set of multiple dip switches that can be moved from "0" to "1." If your opener uses this older system, purchase a generic, keyed garage door remote control, open the battery cover and match the dip switches in the remote control to the dip switches in the motor. Then test.
Read the manufacturer and model number off the motor housing and purchase a replacement door remote control that matches this equipment if the opener does not use keyed codes.
With the door closed, press and hold a remote button on the non-keyed remote control and at the same time press and hold the light button on the door control. Then press and hold the door control push button. Allow the opener light to flash and then release all of the buttons and test.
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