Sub-Zero Classic BI and Designer Code 15-U-01: water relay shorted or stuck closed

What 15-U-01 means

Classic Built-In units like the BI-36U/S and Designer models such as the DEC3050R display 15-U-01. On the Classic BI it means the water system relay is stuck closed. Designer reports a shorted water systems relay, with current detected at the water valve when there should be none. In both cases the valve may stay energized, which can overfill the ice maker, cause dripping at the dispenser, or leave water where it should not be.

Common causes of 15-U-01

Relay contacts stuck together on the board
A shorted water systems relay (Designer)
Wiring keeping the valve circuit live
A water valve drawing current when idle

✓ One safe check you can try

1. Shut off the water supply valve to the refrigerator. 2. Wipe up any water inside or on the floor. 3. Switch the ice maker off. 4. Reset the breaker once; if 15-U-01 returns, leave the water off and call us.

! Why to stop there

A valve stuck on can flood the floor
Testing current at the valve means working near water and power
The board may need replacing and programming

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.

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Other Refrigerator codes

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15-U-0115-U-01 questions

Why is water leaking with 15-U-01?

The relay or valve circuit stays energized, so the valve can keep letting water through. Shutting off the supply valve stops it until we repair the board side.

Is the Designer meaning different from the Classic BI?

Slightly. Classic BI says the relay is stuck closed. Designer says the relay is shorted and current is detected at the valve. Both keep the valve powered when it should rest.

How soon should I book?

Soon, especially if there is water on the floor. Keep the supply off in the meantime. We give a written price before work and stand behind our labor for 30 days.