Symptom: The Wall Switch Works But the Remote Doesn't
Fix: Replace batteries or buy a new remote or receiver
If the wall switch works but one of the remotes doesn't, check the batteries first. Still nothing? You may need a new remote. Home centers carry a few models, and you can find a wide selection online.
If you can't find one for your garage door opener model, you can try a universal remote or you can install a new receiver. A receiver replaces the radio frequency the opener uses with its own. An added bonus of a new receiver is that it will automatically update older openers to the new rolling code technology, which stops the bad guys from stealing your code. Just plug the new receiver into an outlet close to the opener, and run the two wires provided to the same terminals the wall switch is connected to.
Symptom: The Door Goes Up, But it Only Goes Down When You Hold Down the Wall Switch
Fix: Align or replace the safety sensor
If the door goes up but goes down only when you hold down the wall switch, check to see that the safety sensors are in alignment. The small light on each sensor should be lit up when nothing is between them. Door sensors do go bad, so if no light is showing at all, you may need to replace them. You can save yourself some time by using the existing wires. Also, direct sunlight shining on sensor eyes can make them misbehave.
Symptom: You Have Power to the Outlet, But There's No Sound or No Lights When You Push the Wall Switch and Remotes
Fix: Replace the circuit board
If the outlet has power, but there's no sound or no lights when you push the wall switch and remotes, you probably have a bad circuit board. Lightning strikes are the most frequent reason for the demise of a circuit board. The circuit board consists of the entire plastic housing that holds the lightbulb and wire terminals. The part number should be on the board itself.
Replacing a circuit board sounds scary, but it's really quite easy. It will take 10 minutes tops and only requires a 1/4-in. nut driver. Just follow these steps: Remove the light cover, take out the lightbulb, disconnect the switch and safety sensor wires, remove a few screws, unplug the board and you're done. A circuit board will cost about $80, so make sure you protect your new one with a surge protector. You can buy an individual outlet surge protector at a home center for less than $10.