the lights on my craftsman opener flash 10 times and it won't respond to anything

Diagnosis

This specific flashing sequence—10 rapid blinks of the main light bulbs—is the Craftsman 57915's internal diagnostic code for a "Safety Circuit Interruption." The opener's logic board is detecting an open circuit or a misalignment between the two photoelectric sensors mounted at the base of your garage door tracks. Because this is a belt-drive system, the motor is designed to prioritize safety over operation; if the sensors cannot confirm a clear path, the motor will lock out all remote and wall-button commands to prevent the door from crushing an object or person.

This failure typically occurs for one of three reasons: a physical obstruction (like a trash can or cobweb) crossing the beam, a misalignment where the sending sensor is no longer pointing directly at the receiving sensor, or a break in the low-voltage wiring. You can confirm this by looking at the LEDs on the sensors themselves. The "sending" sensor usually has a steady green light, while the "receiving" sensor will have a flickering or off LED if the signal is lost. If both lights are off, you have a power failure to the sensor array.

How to Fix It

To resolve the 10-flash error, follow these precision alignment and testing steps:

1. Clear the Path: Walk the entire width of the garage door opening. Ensure there are no boxes, bicycles, or hanging debris within 6 inches of the sensor beam path. Even a thin spiderweb across the lens can refract the infrared beam enough to trigger the 10-flash code.
2. Verify LED Status: Check the sensor mounted on the right side (typically the receiving unit). If the LED is off or blinking rapidly, the beam is interrupted. The left sensor (sending unit) should have a solid light.
3. Perform a Precision Realignment: Loosen the plastic wing nut on the bracket of the blinking sensor. Slowly pivot the sensor head left-to-right and up-and-down. You will notice the LED flicker as you hit the "edge" of the beam; move the sensor until the LED glows with the maximum possible brightness.
4. Lock the Position: While holding the sensor steady with one hand, tighten the wing nut firmly. Do not over-tighten, as the plastic brackets on the 57915 model are prone to cracking under excessive torque.
5. Test the Circuit: Press the wall button. If the lights stop flashing and the motor engages, the alignment is successful.

If That Didn't Work

• Check for Wire Fatigue: Inspect the thin 22-gauge bell wire running from the sensors to the motor head. Look for staples that have been driven too deep into the drywall, which can pinch and sever the copper core. If you find a break, strip the wires back 1/2 inch, twist them together, and seal them with waterproof electrical tape.
• Clean the Lenses: Use a damp microfiber cloth and a small amount of isopropyl alcohol to clean the infrared lenses on both sensors. Dust buildup or garage grime can attenuate the signal strength, causing the logic board to perceive a blockage.
• Verify Terminal Connections: Power down the unit and check the sensor wire connections at the motor head. Ensure the wires are securely clamped into the terminal blocks and that no stray copper strands are touching adjacent terminals, which would cause a short circuit.
• Replace the Sensor Pair: If one sensor has no LED light regardless of alignment, the internal diode has likely failed. Replace the pair as a set to ensure the infrared frequencies match perfectly.

Heads Up

• Avoid Painting Sensors: Never paint over the sensor brackets or lenses. Even a thin layer of spray paint can block the infrared beam and trigger the 10-flash error permanently.
• Vibration Check: Because this is a belt-drive model, it vibrates less than a chain drive, but the sensors can still drift over time. Check the tightness of the wing nuts every six months.
• Emergency Override: If you must close the door while the sensors are malfunctioning, hold the wall button down continuously until the door reaches the floor. The 57915 will allow a "constant pressure" override for emergency closures.
• Wire Protection: If your wires are exposed, run them through plastic conduit or secure them with cable clips every 12 inches to prevent them from being snagged or chewed by pests.