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Error code reference

Sub-Zero Refrigerator Error Code ICE

Flashing ICE and SERVICE annunciators indicate icemaker water valve solenoid was energized for more than 15…

Sub-Zero codesSub-Zero refrigerator codes

Flashing ICE and SERVICE annunciators indicate icemaker water valve solenoid was energized for more than 15 seconds; icemaker system is disabled (tall units only).

First step from the service manual

Check icemaker area for jammed ice cube, check water supply pressure (20-100 PSI), check water valve operation and resistance (160 ohms). Switch unit OFF then ON to clear.

The complete diagnostic procedure includes additional test steps, resistance specifications, wiring diagram references, and component test points.

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What ICE means on a Sub-Zero refrigerator

The flashing ICE and SERVICE annunciators on a Sub-Zero tall unit indicate that the icemaker water inlet valve solenoid remained energized for longer than 15 seconds during a fill cycle. Under normal operation, the water valve opens briefly to deliver a measured amount of water to the icemaker tray, then closes. When the control detects the solenoid has stayed energized beyond the 15-second threshold, it interprets this as an abnormal fill condition and disables the icemaker system entirely to prevent flooding or mechanical damage.

The water inlet valve solenoid on these units has a rated resistance of approximately 160 ohms. If the solenoid coil resistance deviates significantly from this value, the valve may not open or close correctly. Low water supply pressure, which must fall within the 20 to 100 PSI range, can also cause extended fill attempts because the valve stays open waiting for adequate water volume to enter the tray. A jammed or bridged ice cube in the icemaker mechanism can prevent the harvest cycle from completing, which may indirectly keep the fill valve energized longer than expected.

Because this fault disables the icemaker at the control level, the unit must be power cycled to clear the lockout condition. Switching the unit OFF and then back ON resets the fault flag. However, if the underlying cause is not corrected, the error will return. Technicians should inspect the icemaker compartment for jammed ice, verify incoming water pressure with a gauge, and test the solenoid resistance before restoring power.

Source: manufacturer service documentation.

Common causes of ICE

  1. 01

    Jammed ice cube in icemaker

    Wiring / connection

    A bridged or misshapen ice cube lodged in the icemaker mechanism can block the harvest cycle, keeping the fill valve energized past the 15-second limit. Inspect the icemaker bin and tray area for any ice obstruction and clear it manually.

  2. 02

    Insufficient water supply pressure

    Wiring / connection

    Water pressure below 20 PSI causes the inlet valve to stay open longer trying to complete the fill, which triggers the fault. Use a gauge to verify pressure at the supply line is within the required 20 to 100 PSI range.

  3. 03

    Faulty water inlet valve solenoid

    Part replacement

    A solenoid coil that has failed or drifted from the specified 160 ohms resistance may not open or close reliably, causing an extended energized period. Test the solenoid resistance with a multimeter and replace the valve if the reading is out of spec.

  4. 04

    Water inlet valve mechanically stuck open or closed

    Part replacement

    Mineral deposits or debris can cause the valve plunger to stick, preventing it from closing after a fill cycle begins. This keeps the solenoid energized and triggers the fault even if the coil resistance tests correctly.

  5. 05

    Icemaker control board fault

    Part replacement

    If the icemaker control board is sending a continuous energize signal to the solenoid rather than a timed pulse, the 15-second threshold will be exceeded regardless of valve and water pressure condition. This is less common but should be considered after all other causes are ruled out.

See the test procedure for each cause

Frequently asked questions about ICE

What does ICE mean on a Sub-Zero refrigerator?
Flashing ICE and SERVICE annunciators on a Sub-Zero tall unit mean the icemaker water inlet valve solenoid was detected as energized for more than 15 seconds during a fill cycle. This is a protective fault that disables the icemaker automatically. The most common triggers are a jammed ice cube, low water pressure, or a malfunctioning water inlet valve.
Will resetting the Sub-Zero clear the ICE error code?
Switching the unit OFF and then back ON will clear the ICE fault and re-enable the icemaker. However, if the root cause such as a jammed cube, low water pressure, or a faulty valve solenoid is not corrected, the error will return during the next fill cycle. Always diagnose and fix the underlying issue before resetting.
How do I fix the ICE error on my Sub-Zero refrigerator?
Start by checking the icemaker compartment for any jammed or bridged ice cubes and remove them. Next, verify that incoming water pressure is between 20 and 100 PSI using a pressure gauge at the supply line. If those check out, test the water inlet valve solenoid resistance with a multimeter; it should read approximately 160 ohms. Replace the valve if resistance is out of spec, then power cycle the unit to clear the fault.
Is the ICE error on a Sub-Zero refrigerator a safety concern?
The ICE fault is a protective lockout designed to prevent flooding caused by a water valve that stays open too long. The icemaker is disabled automatically, so there is no immediate safety risk to the unit or your home as long as the fault is addressed promptly. You should still diagnose the cause soon to avoid water damage if the valve condition worsens.
How much does it cost to repair the ICE error on a Sub-Zero refrigerator?
Repair cost depends on the root cause. Clearing a jammed ice cube or adjusting water pressure costs nothing beyond a service call if a technician is needed. Replacing a faulty water inlet valve on a Sub-Zero typically runs anywhere from $150 to $400 or more depending on the specific model and labor rates in your area. Control board replacement, if required, will generally cost more.

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