Sub-Zero Designer Code 15-C-01: condenser relay stuck closed

What 15-C-01 means

Designer integrated models in the DET/DEC line, such as the DET3050CI and DEC3050R, list 15-C-01 as a condenser relay that is closed when it should not be. Code family 15 covers the board's relays, so this one has stuck in the on position for the condenser circuit. The board can no longer switch that circuit off on its own schedule. Owners may notice the unit running longer than usual, extra warmth at the grille, or simply the code on the screen.

Common causes of 15-C-01

Condenser relay contacts stuck together on the control board
A board output that will not release
Wiring that keeps the condenser circuit powered

✓ One safe check you can try

1. Listen at the grille: does the unit seem to run without ever pausing? 2. Keep the grille clear so heat can escape. 3. Check cabinet temperatures; overcooling is possible. 4. Turn the breaker off for one minute and back on. 5. If 15-C-01 returns, call us and mention it.

! Why to stop there

The relay sits on a board carrying line voltage
Equipment in the machine compartment runs hot and moves
A replacement board must be programmed for your model

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-C-0115-C-01 questions

Why does my Designer seem to run all the time with 15-C-01?

The condenser relay is stuck closed, so the board cannot turn that circuit off when it wants to. Long, unbroken run times are the result. We confirm it with the relay readings before any part is ordered.

Can running nonstop harm the refrigerator?

Long continuous running adds wear and heat in the machine compartment. It is not usually an emergency, but booking a visit within a few days protects the rest of the system.

What will you do on the visit?

We check the relay output, the board and the wiring to the condenser circuit, then quote a written price. The repair is backed by our 30-day workmanship warranty.