A filter reminder concerns the function defined for that indicator. It should not be assumed to diagnose cooling in either food compartment.
What the observation tells you
An elapsed-time reminder may remain lit while temperatures are normal, or a cooling problem may coexist independently. Resetting the reminder does not physically replace a filter and does not repair refrigeration. Models without a plumbed filter require different identification.
A useful next step
Read the exact indicator description and assess the water feature and temperatures separately. Use compatible maintenance parts where applicable and avoid clearing unrelated warnings without recording them.
Manuals and supporting guidance
Model-specific instructions take priority. These references support the practical principles discussed here; they do not diagnose your appliance.