No ice production, partial harvest, or hollow cubes.
Viking factory service documentation associates this symptom with the following components. Which one is at fault is determined by measurement on site, not by the symptom alone.
Most Viking gas ranges, rangetops and cooktops have no diagnostic display — mechanical valves, thermocouples and spark ignition report nothing. Built-in refrigeration and electric wall ovens do produce codes; if yours shows one, the fault code reference lists what each platform reports.
Note the model number from the rating plate and the exact behaviour — when it started, whether it is constant or intermittent, and any code on the display. That determines which parts are carried to the visit.
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Component list derived from 41 Viking service documents.