Garage Door Sensor Problems: Diagnosis and Fixes

Photoelectric safety sensors stop your door from closing on people, pets, or objects. When they malfunction, the door may refuse to close or reverse for no apparent reason. Common Symptoms: - Door closes halfway then reverses - Door won't close at all - One sensor light is blinking or out Diagnosis Steps: 1. Check for obstructions — Even a spiderweb can block the beam 2. Wipe the lenses — Dirty lenses = blocked signal 3. Check alignment — Both sensors must point directly at each other. Loosen the mounting wing nut and adjust until both lights are steady 4. Check wiring — Look for pinched, cut, or loose wires 5. Check for sunlight interference — Direct afternoon sunlight can confuse sensors. Try shielding them If none of these work, the sensors may need to be replaced. They're an inexpensive but critical safety component.