Diagnostic Codes for Older Chamberlain and LiftMaster Openers. Older Chamberlain and LiftMaster garage door openers that only feature a single learn button also have self-diagnostic capabilities. The LED light next to the learn button will flash various times, then pause before repeating, which lets you know what issue your opener is having.. The Chamberlain garage door openers is renowned for its reliability and convenience, but encountering unexpected issues like a flashing wall button can be frustrating for homeowners. In this comprehensive guide, we'll delve into the common causes behind the Chamberlain garage door opener wall button flashing and provide step-by-step.
If you have a garage door opener with a flashing light that blinks 10 times, it means there is a problem with the safety sensors. These sensors are located at the bottom of the garage door track on both sides and are used to prevent the door from closing when something is in the way.. Another possible cause of a garage door light that blinks.. # of Flashes. Problem. Auto Reset. Manual Reset. 1. Photo-Cell totally misaligned or Photo-Cell wire open. X . 2. Photo-Cell wire shorted or the wire is reversed on the terminals. X . 3. Wall button (panel) wire is shorted in wall or attic. X . 4. Photo-Cell sensor slightly misaligned (dim or flashing LED on sensor) X . 5