Sub-Zero Refrigerator Error Code 30 U 30

Error code 30 U 30 means the icemaker water valve solenoid was held energized for more than 35 seconds during a fill cycle without the flow meter confirming water delivery. As a safety measure, the refrigerator disables the icemaker system to prevent overflow. The code points to a problem with water supply, the flow meter, or the solenoid itself. The icemaker will remain disabled until the fault is cleared manually.

A simple power cycle will not permanently clear this code. The Sub-Zero control requires you to press and hold the ALARM key for 15 seconds after the underlying problem has been corrected. If the root cause is not fixed before resetting, the code will return as soon as the icemaker attempts another fill cycle.

Repair costs vary depending on the failed component and labor rates in your area. A water valve solenoid or flow meter replacement typically ranges from around 150 to 400 dollars including parts and labor. If the fault is simply a restricted supply line or closed shut-off valve, there may be no parts cost at all. Control board replacement, the least common cause, can push costs considerably higher, often in the 400 to 800 dollar range or more.

Start by confirming the water supply valve is fully open, the supply line is not kinked, and the inlet screen is free of debris. Next, test the water valve solenoid with a multimeter: it should read between 160 and 165 ohms. If the solenoid and supply check out, inspect the flow meter for a stuck or fouled turbine. Once the root cause is corrected, press and hold the ALARM key for 15 seconds to clear the fault and re-enable the icemaker.

The code itself represents the refrigerator responding correctly to a potentially unsafe condition. The control disables the icemaker to prevent the water valve from running indefinitely and causing a leak or flood inside or around the unit. As long as the icemaker is disabled, there is no active flooding risk, but the underlying issue that triggered the fault should be diagnosed and repaired promptly.