Sensor-light meanings depend on the opener and sensor model. Report which light is steady, flashing or off and what happens when the door tries to close. Two illuminated lights do not replace a complete assessment of a closing fault.
Observe from outside the door’s path
Note whether something is visibly blocking the beam and whether a sensor appears knocked out of position. Keep hands away from moving components and avoid standing beneath an unstable door. A photograph from a safe location can help document the indicators.
Use the correct model information
Color conventions and diagnostic messages vary. Read the owner’s instructions for the actual equipment instead of interpreting a green or amber light using an unrelated brand’s chart. If an opener also displays an error code, report that separately.
Keep safety devices in the repair scope
If the door will not close normally, describe that behavior when requesting service. Do not bypass the sensors or use an override as a routine workaround. The intended safety operation needs to be restored, not hidden.
Frequently Asked Questions
Does a green light always mean the whole system is fine?
No. Its meaning is model-specific, and a light observation alone does not establish that the door and all safety functions are operating correctly.
Can I book service without understanding the light pattern?
Yes. Report what you can see and how the door behaves. You do not need to diagnose the failed component before calling.