A garage door that opens normally but refuses to close may have a problem with its safety sensors. An interrupted beam, damaged wire or failing component can look similar from the wall control. Jack’s checks the symptom against your opener’s model and the condition of the door before recommending sensor replacement.
Read the symptom in context
Tell us whether the door starts closing and then reverses, never moves at all, or behaves differently at particular times of day. Note any flashing lights you can see from a safe position. Light colors and flash sequences vary by manufacturer; a green light on one model does not have the same meaning on every opener.
Check the sensing system as a whole
The photo-eyes, their mounts, wiring and opener connections form a system. A visibly damaged bracket or cable can matter as much as the sensor itself. Replacement sensors must be compatible with the operator. The assessment should also distinguish sensing problems from a door that binds or meets a physical obstruction.
Keep the safety function working
A repair should restore the intended safety function. Do not cover, bypass or disconnect sensors to force the door closed. Keep the opening clear, keep children away from controls and describe the problem when you request service. If the door is visibly crooked or unstable, stop using it until the mechanical condition is assessed.
Your questions, answered.
Does a blinking light always mean the sensor is broken?
No. The meaning depends on the opener model and its diagnostic instructions. Beam interruption, alignment, wiring and other conditions may need consideration.
Can a sensor repair fix every reversing door?
No. Track problems, obstructions and other door or opener faults can cause similar behavior. Diagnosis should include the complete system.