If your garage door keypad is not working after changing battery, several causes related to battery installation, programming loss, or keypad damage can prevent operation even with new battery. First, ensure new battery installed correctly with positive and negative terminals matching markings, as reversed battery causes no power, and ensure battery type correct, typically 9-volt, AAA, or coin cell, and battery fresh, not old stock with low charge, testing with voltmeter if needed. Some keypads lose programming if battery removed for more than 30 seconds, causing memory to clear, so if you had battery out too long, keypad may need reprogramming by pressing Learn button on garage door opener motor unit and entering PIN on keypad within 30 seconds and pressing Enter until opener light blinks, indicating resynced. Check if battery contacts corroded from old battery leak, cleaning contacts with dry cloth or pencil eraser to ensure good connection. Ensure keypad cover properly closed, as some keypads have tamper switch that prevents operation if cover not seated. Wall console may be in lock mode that disables keypads, indicated by blinking light, so press and hold lock button 5 to 10 seconds to unlock. Radio interference from LED bulbs in opener can block keypad signal, so replace with approved bulbs. If keypad still fails after correct battery and reprogramming, keypad circuit board may have been damaged during battery change or from water intrusion, requiring replacement costing 30 to 60 dollars.
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