Garage Door Opener Blinking Lights: What the Codes Mean

Sensor and wiring codes

The majority of blink codes involve the two photo-eye safety sensors near the floor. Patterns vary by brand, but the families are consistent.

• One or two blinks: sensor wire open, shorted, or a sensor unplugged.
• Four blinks: sensors are wired but misaligned — the beam is not landing on the receiver.
• Five blinks: motor or RPM sensor fault inside the head.
• Six blinks: logic board fault, usually after a surge.
• Steady click with no motion: the door is locked or the trolley is disconnected.

Why sensor wiring fails so often

Sensor wire is thin two-conductor bell wire stapled along the wall and doorframe. It fails in predictable places.

• A staple driven through the insulation, shorting the pair.
• Rodent chewing where the wire runs behind stored boxes.
• A sensor bracket bumped by a bike, trash bin or car door.
• Sun glare hitting a west-facing receiver in the late afternoon — a real and repeatable fault.
• A wire nut connection that corroded in a humid garage.

The safe reset sequence

Before calling, unplug the opener for 30 seconds and plug it back in. That clears transient board faults. If the code returns immediately, it is a genuine hardware fault, not a glitch.

Never bypass or tape the sensors to make the door close. The auto-reverse system is the only thing standing between a 200-pound door and whatever is under it.

What repair looks like

A sensor pair, bracket and full wire run replacement is a routine visit. A logic board replacement on an opener over ten years old is usually not worth the parts cost compared with a new unit that carries a fresh warranty and current safety features.