Sub-Zero error code · 30 U 10
Sub-Zero Code 30 U 10: Dispenser Water Valve Open Circuit
Sub-Zero code 30 U 10 means the dispenser water valve circuit reads open. Usually a failed valve solenoid or broken wiring to the dispenser valve.
Sub-Zero code 30 U 10 means the control board detected an open circuit at the dispenser water valve, so its solenoid draws no current when energized. The fix is to ohm-test the dispenser water valve solenoid and wiring and replace the failed valve.
The meaning of 30 U 10
The dispenser water valve opens to deliver chilled water at the door dispenser, separate from the icemaker fill valve. This code is set when the board sees an open circuit on that valve's solenoid, meaning the coil or wiring has lost continuity. With the circuit open, the dispenser cannot deliver water.
Signs of 30 U 10
- No water from the door dispenser
- Dispenser water pad does nothing while ice still works
- No fill sound when water is requested
- Code stored in diagnostics with no SERVICE light
- Water flow stops abruptly after the valve fails
Most-likely causes
- Open (failed) dispenser water valve solenoid coil
- Broken or corroded connector at the dispenser valve
- Damaged wire in the dispenser valve harness
- Loss of supply to the dispenser valve circuit
- Plug not reconnected after prior service
The part usually behind 30 U 10
- Dispenser water valve — Replace when the solenoid coil tests open and wiring is intact
- Dispenser valve harness/connector — Repair or replace when the open is in the wiring or connector
Root causes behind 30 U 10
The solenoid coil breaks down and opens after prolonged energizing, and connectors at the valve corrode in the damp valve area. The harness can chafe or fatigue, and a disconnected plug after service reads open. Hard-water service compartments accelerate corrosion at the terminals.
Safe owner checks
- Confirm the household water shutoff is open
- Test whether ice still dispenses to isolate the water side
- Power-cycle the unit and retry the water dispenser
- Note the code and that water dispensing has stopped
When professional service is needed
Confirming an open dispenser valve requires measuring solenoid ohms and harness continuity, then replacing a valve on a pressurized line. A technician verifies the open and prevents leaks during replacement.
Frequently asked
Common questions about Sub-Zero 30 U 10
What does Sub-Zero code 30 U 10 mean?
Code 30 U 10 means the control saw an open circuit on the dispenser water valve solenoid, the valve that delivers chilled water at the door dispenser. Its coil or wiring has lost continuity, so the dispenser cannot fill even when you press the water pad. This valve is separate from the icemaker fill valve, which is why ice often keeps working.
Is 30 U 10 something I can fix on my own?
The owner-safe steps are confirming the household water shutoff is open, testing whether ice still dispenses to isolate the water side, and power-cycling the unit. The repair itself, ohm-testing the dispenser valve solenoid and replacing it on a pressurized line, should be left to a technician to avoid a leak during the swap.
How do I clear code 30 U 10 once the dispenser valve is repaired?
After the open is corrected, replacing the dispenser water valve or repairing its connector, the control reads normal coil resistance again and the code clears. Power-cycling the unit removes the stored fault from diagnostics so you can verify door-dispensed water flows again on the next request.
Can I keep using the fridge while 30 U 10 is active?
Yes. Cooling is unaffected and there is no safety risk, so you can run the unit normally. You will simply lose chilled water at the door dispenser until the valve circuit is restored. In many 30 U 10 cases ice still dispenses fine because the icemaker uses its own fill valve.
What part is involved in 30 U 10 and what does service cost?
The typical fix is the dispenser water valve with an open solenoid, or a corroded connector in the damp valve area. Our flat diagnostic is $89, credited toward the repair, and the work is backed by a 365-day warranty. Reach us at (650) 668-1554 to schedule.
How can a tech tell 30 U 10 apart from the main water valve code 30 U 00?
The giveaway is that with 30 U 10 the icemaker usually still works and only door water fails, whereas 30 U 00 stops both ice and water because it is the main inlet valve. A technician confirms 30 U 10 by measuring ohms across the dispenser valve solenoid specifically and checking continuity on its harness back to the board.
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