ApplianceField Lab
Field evidence

The Drain Pump Started Immediately, but the Ice-O-Matic GEMU090 Panel Stayed Dark

Water also leaked around the reservoir valve and cover. Replacing that valve alone had not yet been proven to address the constant drain.

Ice Machine Ice Maker Ice-O-Matic gemu090

Why the leak and constant drain had to be separated

A reservoir valve leak can add water that the machine then tries to remove. A false water-level signal or blocked drain path can also command or prolong pumping even when the reservoir part is intact.

A similar symptom can have a different cause on another undercounter ice machine. Leak sensing, float logic, a level tube, pump wiring and the control supply can overlap.

The open Ice-O-Matic GEMU090 with its stainless bin and front control panel; continuous drain-pump operation was reported in the source.
The open Ice-O-Matic GEMU090 with its stainless bin and front control panel; continuous drain-pump operation was reported in the source.
The reservoir-valve and cover area marked where water leaked near the on/off indication.
The reservoir-valve and cover area marked where water leaked near the on/off indication.

The level-sensor tube branch

A technician familiar with the layout pointed to a thin tube leading to the water-level sensor behind the lower front access. Mold or residue in that tube could distort the level signal and produce constant, slow or missing drainage. The main tube to the pump was a second inspection point.

What the source did not establish

The source ended before water was isolated, either tube was inspected or the reservoir valve was replaced. It also did not explain why the control panel was dark. Those facts keep the page as an unresolved model-specific decision tree rather than a confirmed blockage.

Water and electrical safety: disconnect power and close the water supply if the reservoir leaks or the pump runs continuously. Internal tubing and pump access can release water near electrical parts and requires qualified service.
Unexpected turn

A repair that did not follow the obvious path

An unusual turn supported by the case record Sub-Zero Not Cooling One Month After Sealed-System Repair A Sub-Zero stopped cooling a month after compressor and evaporator work. A clean evaporator shifted the diagnosis toward an oil-line restriction; the final repair …
Fresh field notes

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