Sub-Zero Ice Maker Overfill / Valve Sticking

Ice maker overflows or leaks water into the freezer compartment.

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Safety Warning

This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.

If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.

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Possible Causes

Ice maker fill valve stuck open, Ice maker not shutting off due to faulty sensor, Incorrect water pressure too high, Misaligned ice maker or fill cup

How to Fix / Troubleshooting

Safety first: Turn off the water supply to the refrigerator immediately to stop the leak. Unplug the unit before further work.

Step 1 – Inspect ice maker alignment

  • Ensure the ice maker is level and the fill cup is correctly positioned under the fill tube.
  • Adjust mounting screws if needed.

Step 2 – Check for ice blockage

  • Look for ice buildup in the fill cup or around the ice maker that could divert water.
  • Thaw any ice with a hair dryer on low.

Step 3 – Test water inlet valve

  • With water supply restored briefly, observe the fill cycle. If water continues to flow after the cycle ends, the water inlet valve is likely sticking and should be replaced.

Step 4 – Replace ice maker if sensor failed

  • If the valve shuts off correctly but the ice maker continues to call for water, replace the ice maker assembly.
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Repair Difficulty

Medium 3/5

Required Part

Dual Water Inlet Valve
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