Large stainless refrigerator set flush between kitchen cabinets

Generic photo: Alex Qian · Pexels License

Undercounter ice maker install: water, drain (gravity or pump) and venting

Undercounter ice makers need a cold-water line with shutoff and a way to drain melt water: gravity to a floor drain or standpipe below the unit, or a drain pump model/kit when the drain is higher. Keep the front grille clear and level the unit carefully so water drains.

Single source ~120 min moderateBrands: All

Before you start

Unplug the unit while connecting water and drain.
Use a grounded outlet; no extension cords.

Diagnostic steps

Unlock all 5 steps with expected values

Full library + AI assistant for $34.90, one time.

Get lifetime access

OnCall Tech is a reference tool for trained technicians and can make mistakes. Always disconnect power and confirm with the manufacturer's documentation before you work.

More ice makers guides

Guide · Ice Maker

Countertop ice maker shows 'Add Water' with water in the reservoir

These units detect water with a float, probe or wire sensor in the reservoir and a small pump that lifts water to the tray. Scale on the sensor, a blocked reservoir screen, a stuck float, very pure water or a weak pump can all trigger a false Add Water.

4 steps ~30 mineasy

Guide · Ice Maker

Undercounter ice maker: ice slab will not release or sticks on the cutting grid

Grid-cutter (slab) ice makers freeze a sheet, release it during harvest and let a heated wire grid cut it into cubes. Most release problems come from an unlevel cabinet, scale on the evaporator plate, or a cutting grid that is unplugged or not heating. Harvest switches and probes are next.

5 steps ~60 minmoderate

Guide · Ice Maker

Undercounter ice maker not making ice

Check power, water supply and pressure, drain (pump models stop when they cannot drain), bin sensor, cleaning status, condenser and room temperature. Scale is the most common cause on older machines.

7 steps ~60 minmoderate