The light's meaning and reset behaviour depend on the model. It may relate to correct seating, a different condition or a documented acknowledgement rather than tank volume alone.
Understanding this situation
Do not assume a specific pump has failed, and do not keep running through the warning. Record whether it appears immediately or during a cycle and check the exact instruction.
A useful next step
Refit the container only as directed and follow permitted guidance. If the message persists, seek model-specific assessment. Do not bridge a tank switch, tilt the dryer or disconnect drainage simply to make the indicator disappear.
Manuals and supporting guidance
Model-specific instructions take priority. These references support the practical principles discussed here; they do not diagnose your appliance.