If your Guardian garage door operator is beeping, count the beeps. Guardian reports that 20 beeps is a signal that the operator's photo eye safety system has been blocked while you are closing the door. Refer to your operator manual to ensure the photo eyes are properly aligned.
If you hear 12 beeps, that can be a sign that your operator is traveling at an abnormal speed or won't move. Guardian suggests the operator is either not receiving a command to start or stop, or is not receiving position information from the RPM encoder. First, unplug the opener and wait for a few seconds. Then, reconnect it to the power source. If the courtesy light flashes five times, follow reprogramming steps included in your manual.
If you hear five beeps, Guardian suggests reprogramming the limit and force program stored in your operator's memory. Check your owner's manual for reprogramming steps.