Sub-Zero Classic BI Code 15-U-11: check valve relay stuck closed

What 15-U-11 means

On a Classic Built-In model like the BI-36U/S, 15-U-11 means the water check valve relay is stuck closed. That keeps power on the check valve even when no water is requested. Depending on how the other valves behave, you may see dripping at the dispenser, an overfull ice bin, or water collecting where it should not. Cooling generally continues normally, but the water side needs attention before leaks cause damage.

Common causes of 15-U-11

Check valve relay contacts stuck on the board
A board output stuck in the on state
Wiring that keeps the check valve circuit live

✓ One safe check you can try

1. Turn off the water supply to the refrigerator. 2. Dry any water inside the cabinet, at the dispenser, or on the floor. 3. Turn the ice maker off. 4. Reset the breaker once; if 15-U-11 returns, keep the water off until we arrive.

! Why to stop there

A valve left powered can leak into cabinets and flooring
Testing the relay requires a live board
Water and power are close together in this area

Opening a panel yourself does not automatically cancel a manufacturer warranty, but it can cause accidental damage, and some manufacturers set their own service conditions. Check your warranty terms, or ask us, before deciding.

→Same appliance

Other Refrigerator codes

23Sub-Zero 600, 700 and 648PRO Code 23: Defrost overheat with no feedback 50Sub-Zero 600 and 700 Series Code 50: Refrigerator compressor running too long 41Sub-Zero 648PRO Code 41: Zone compressor or wiring problem 81Sub-Zero 700-2 Code 81: Variable-Speed compressor fails to start 82Sub-Zero 700-2 Code 82: VS compressor controller needs replacement 88Sub-Zero 700TF Code 88: Board and compressor controller not talking 80Sub-Zero 700TF Code 80: No inverter feedback after a board change ddSub-Zero 600 and 700 Series Display dd: Diagnostics switched off

15-U-1115-U-11 questions

Should I turn off the water with 15-U-11?

Yes, if you see any dripping or overfilling. The check valve relay is stuck closed, so the valve stays powered. Shutting the supply prevents water damage to cabinets and flooring.

Is 15-U-11 the opposite of 15-U-10?

Yes. 10 is the check valve relay stuck open, so no power reaches it. 11 is stuck closed, so the valve stays powered even when no water is needed.

What does the repair include?

We test the relay and valve, fix the board side, and run the dispenser and ice maker to confirm there are no leaks. You approve a written price before we begin.