The most common reason for the lights to flash on the garage door opener and the door not closing is that the safety reversing sensors are misaligned or obstructed; this is a safety feature of the garage door opener. ... Four (4) flashes indicate the sensors are slightly misaligned.
Why is my garage door button flashing green?
Green LED: The garage door opener is NOT running off battery power. A solid green LED indicates the battery is fully charged. A flashing green LED indicates the battery is being charged.
Why is my liftmaster button blinking?
Your garage door opener is programmed with self-diagnostic capabilities. The diagnostic LED light next to the learn button will flash a number of times, then pause before repeating, signifying it has found a potential issue.
Why are the up and down arrows flashing on my garage door opener?
If you see the up arrow blink only once and the down arrow blink twice, it means that your garage door opener would not close. The main LED light should be flashing. This happens because the photocell wire has been cut or more possibly, the wires are reversed. Check these wires and make the necessary adjustments.