Easy fix was I used 9s forever, now I use 8s. Try one of these solutions to repair your a garage door opener keypad. Start by looking over the manual for common problem advice. The answer could be an incorrect code or no power.
Cold weather affects the connections due to temperature or condensation. Also, dirt from construction or lawn debris after many seasons can buildup over the contacts.
Changing the code works sometimes because over time the buttons wear on the same numbers. This works if you have used the same number for years or only use the same row of numbers like 456.
Check the power because it could be the broken or loose wire connection, tripped breaker or dead battery.
One customer lost his garage door opener code after a power outage.
Finally, replace the garage keypad with a universal garage door opener keypad, like Chamberlain.
http://www.mrhardware.com/