KitchenAid and Whirlpool under-counter ice makers are expensive — easily $1,000–3,000 — and many repair companies avoid them because they’re unfamiliar. In reality, these units are fairly straightforward appliances once you understand how the production cycle works.

This guide walks through the ice production cycle, common failure points, and what to check before calling a technician.

Understanding the Production Cycle

Before you can diagnose a problem, you need to understand what’s supposed to happen. The ice production cycle on KitchenAid/Whirlpool under-counter units follows this sequence:

  1. Harvest cycle begins — The hot gas valve opens briefly to warm the evaporator plate and release any finished ice
  2. Ice drops into bin — Ice slab slides off the evaporator into the storage bin
  3. Fill cycle — The water valve opens and water floods the evaporator tray to the correct level (controlled by the water level sensor)
  4. Freeze cycle — The compressor runs and refrigerant cools the evaporator plate; water freezes from the bottom up over 15–30 minutes
  5. Harvest again — Cycle repeats

If something goes wrong in any step, you’ll get no ice, soft ice, small ice, or a leak.

Common Problems and What Causes Them

No Ice at All

Check first: Is the power on? Is the unit plugged in? Is the bin full (the bin-full sensor stops production when the ice level is too high)?

If power is confirmed:

  • Water inlet valve failure — The valve opens to fill the tray. If it’s not opening, no water means no ice. You can often hear a click when the valve should open; no click suggests a solenoid failure or control board issue.
  • Compressor not running — If the compressor doesn’t start, the unit won’t freeze anything. You’ll hear the fan run but no compressor hum. Check capacitor and relay.
  • Thermostat or sensor fault — The unit uses multiple temperature sensors to decide when to start and stop the freeze cycle.

Small or Thin Ice / Ice Not Harvesting Cleanly

  • Low refrigerant — If the unit is low on refrigerant, the evaporator won’t get cold enough to make full-size ice. This requires a certified HVAC/refrigeration technician to diagnose and recharge.
  • Dirty condenser coils — Restricted airflow to the condenser causes the system to run warmer and produce smaller ice. Clean the coils with a coil brush or compressed air (see below).
  • Water temperature too high — Under-counter units struggle when incoming water or ambient temperature is very high. In Oklahoma summers, kitchen ambient temps can affect performance.

Ice Maker Leaking

  • Water inlet valve not seating fully — Drips from the fill valve or water line connection
  • Drain line clogged or kinked — The unit has a drain that removes meltwater. If it’s clogged, water backs up and leaks from the bottom
  • Door gasket worn — Warm air enters and causes condensation/dripping

Unit Running but Not Making Ice (Fan and Compressor Both Running)

This is the classic sign of a refrigerant issue. The system is working mechanically but can’t build up enough cooling. Call a refrigeration technician.

Maintenance Steps You Can Do Yourself

Clean the Condenser Coils

The condenser (usually on the bottom or back of the unit) pulls in ambient air to reject heat. Lint and dust restrict airflow and reduce efficiency. Clean every 6–12 months with a coil cleaning brush or vacuum.

Clean the Water System

Mineral deposits from hard water build up on the evaporator plate and water distribution system. Manufacturers recommend running a cleaning cycle with ice machine cleaner every 6 months. Nickel Safe Ice Machine Cleaner is widely available and is the standard recommendation for KitchenAid/Whirlpool units.

Check and Clear the Drain

Run a cup of water slowly into the drain opening to confirm it’s flowing freely. If it backs up, the drain line is clogged — disconnect it from the unit and flush it from the other end.

When to Get the Service Manual

For model-specific wiring diagrams, error codes, and component test procedures, you need the service manual for your unit. KitchenAid and Whirlpool service manuals are usually available through AppliancePartsPros or from authorized distributors. Search your model number + “service manual.”

These manuals show exactly how to test each component with a multimeter and what resistance values to expect.

Getting Help in Edmond / OKC

We work on KitchenAid and Whirlpool under-counter ice makers regularly. These units have quirks that take some experience to diagnose efficiently — if you’ve gone through the basics above and can’t pinpoint the problem, a professional service call is usually well worth it on a $1,500+ appliance.

Call us at 405-730-9131 for service in the Edmond and OKC metro area.