Door will not close from remote; opener clicks but reverses or will not move; diagnostic LED on logic board flashes twice repeatedly.

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

Steps to diagnose sensor circuit:

• 1. Visual wire inspection: Follow the two-conductor cable from each Stanley photo eye back to the opener. Look for crushed insulation, exposed copper, or wire pulled loose from the sensor body.
• 2. Check terminal connections: Remove the opener cover to access the logic board. Verify that the sensor wires are firmly clamped under the correct screw terminals (often labeled SEN or with sensor icons). Tighten any loose screws and ensure no stray strands are touching adjacent terminals.
• 3. Test continuity: With power still off, disconnect the sensor wires at the opener. Use a multimeter set to continuity or low ohms to test each pair of wires going to the sensors. An open reading indicates a break; a dead short (near 0 ohms) may indicate a staple or pinch point.
• 4. Repair or replace cable: If you find a damaged section, cut it out and splice in new low-voltage bell wire using weather-resistant wire nuts or gel-filled connectors. Keep splices off the floor and away from moving parts.
• 5. Sensor replacement test: If wiring checks good but the LED code persists, temporarily connect a short test lead (2–3 ft) directly from the opener to one sensor pair. If the code clears, the original cable run is faulty. If not, replace the sensor pair with a Stanley-compatible kit.
• 6. Final test: Restore power, confirm the sensor LEDs are solid, then test door operation with the remote and wall button.