Temperature sensor of evaporator replaces 1851701002

The evaporator temperature sensor is what the controller trusts to decide when the plate is cold enough to build ice and when to transition to harvest. If sensor 1851700200 (replacing 1851701002) reads wrong, you’ll see strange cycle behavior: short freezes that make thin ice, endless freezes that lead to a freeze-up, or harvests that start late so the slab won’t release (“ice not dropping”). When this sensor reads too warm, the controller may end freeze early thin cubes, hollow centers, and “not cooling” complaints follow. Diagnosis is about matching the reading to reality. Inspect the sensor mount and contact point loose mounting or heavy scale can insulate the probe and delay response. Then compare resistance to temperature using a meter and a known surface reading. A sensor that intermittently opens can also mimic “no power” events because the controller may stop the cycle on fault. When it reads too cold, you’ll see long freezes, potential freeze-up, and harvest that can’t release so “ice not dropping” shows up. Replacing the evaporator temp sensor fixes cycle logic by restoring accurate temperature feedback. With reliable data, the machine can build consistent thickness, avoid freeze-ups, and enter harvest at the right moment for clean release. It’s one of the quickest ways to eliminate intermittent “not cooling” complaints that are actually control timing errors. Evaporator temp sensor 1851700200 must have good thermal contact; re-mounting incorrectly can mimic a bad sensor. After replacement, run multiple cycles and watch ice thickness, freeze duration, and harvest release. Consistent timing and repeatable slab drop confirm the sensor is doing its job. After replacement, confirm ice thickness is repeatable across cycles and that harvest starts at consistent temperatures.