Canyon County hard water, year 4–6 failure timeline
Ice maker fill valve calcium blockage is a consistent Nampa appliance call. At 170–230 PPM hardness, Nampa water creates fill valve scale accumulation that typically produces restriction at years four to six for unfiltered refrigerators. Karcher and south Nampa's 2012–2018 construction is now in this first-service window.
Refrigerators installed in Karcher-area Nampa construction from 2012–2020 are now 5–13 years old — squarely in the first-service ice maker window for Nampa's water hardness. If your Nampa refrigerator's ice production has slowed or stopped, hard water fill valve blockage is the most likely cause.
Nampa's groundwater shows seasonal mineral variation from agricultural irrigation return flows in some distribution areas. Ice quality and production rate may fluctuate seasonally in Nampa homes on affected distribution zones. An inline filter at the refrigerator supply connection buffers this variation and prevents it from affecting ice system components.
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