A few weeks ago the garage door no longer would open when using the main keypad on the garage wall. The little green light on that keypad is blinking constantly, but the remote keypads in our cars would still open the garage door as would the remote keypad we have mounted outside on the garage frame.
However, a few days ago, the keypads in our cars no longer open the garage door (yes, we did check the batteries in those keypads) and now it only opens with the remote keypad that's mounted outside on the garage frame.
Any ideas? We do not know where to start looking for the cause of this. Thank you in advance for your assistance.