Evaluate the actual failure
A door component, fan or control problem is a different decision from a major refrigeration-system failure. Get a diagnosis and written repair option before comparing it with replacement.
Consider the whole appliance
Look at door condition, gaskets, interior components, prior repairs, temperature stability and the condition of both refrigerator and freezer systems. Multiple unrelated problems can change the economics of repair.
Remember the installation
Replacing a built-in refrigerator may involve cabinet dimensions, panels, electrical or plumbing connections and changes between legacy and current product generations. Manufacturer replacement guides can help identify successor models, but field measurements remain important.
Parts availability
Legacy 500, 600 and 700 Series units are no longer current product lines. Parts availability can therefore be an important part of the repair decision.
Frequently asked questions
Is a 20-year-old Sub-Zero worth repairing?
Sometimes. The answer depends on the specific failure, overall condition, parts availability, repair cost and what replacement would require in the existing kitchen.
Should I replace an old refrigerator just because of its age?
Age is one factor, not a complete diagnosis. A repair-first evaluation can provide the information needed to compare options.