Moisture sometimes gets behind the wall console and causes the terminals to rust, resulting in a bad connection at the wires. Removing a wall console for a LiftMaster to replace it with a new one is a straightforward process.
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Position a step ladder under the LiftMaster garage door opener so that you can reach the power cord. Unplug the power cord from the ceiling outlet.
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Remove the screw securing the top of the wall console to the wall. Turn the bottom screw counterclockwise two complete turns to loosen it from the wall.
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Slide the wall console up to remove it from the bottom screws. Turn the wall console over so you can access the wires on the back of the unit.
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Loosen the screws securing the wires to the back of the wall console. Pull the wires off the terminals.