Opener lights flash and unit will not run; six flashes or code “6” on Decko opener LED.

Safety first: Disconnect power before working on low-voltage wiring. Do not bypass safety sensors for normal operation.

Inspect wiring path:

• Follow the wires: Trace the two-conductor cables from the Decko opener head down to each safety sensor.
• Look for damage: Check for crushed insulation, staple punctures, or splices that have pulled apart.
• Repair or replace: Cut out damaged sections and use new low-voltage garage door wire, or replace the entire run if heavily damaged.

Check connections:

• At the opener head: Confirm the sensor wires are landed on the correct terminals (often labeled “SENS” or with sensor icons). Tighten loose screws.
• At the sensors: Ensure the wires are firmly clamped in the sensor terminals and not reversed if your model is polarity-sensitive.

Test sensors:

• Restore power and observe the LEDs on both sensors. One should be solid, the other solid when aligned.
• If one LED is off even with good wiring, swap the sensors left-to-right. If the problem follows the sensor, replace the sensor pair.

Do not permanently jumper or bypass the sensor circuit; this defeats the safety system and violates code.