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Error code reference

Sub-Zero Refrigerator Error Code 15 8 00

Ice maker relay is stuck open; no power to ice maker.

Sub-Zero codesSub-Zero refrigerator codes

Ice maker relay is stuck open; no power to ice maker.

First step from the service manual

Verify ice maker relay is stuck open. Replace control board.

The complete diagnostic procedure includes additional test steps, resistance specifications, wiring diagram references, and component test points.

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  • Wiring diagram references and connector pinouts from the OEM service manual
  • Verified part numbers when replacement is required
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What 15 8 00 means on a Sub-Zero refrigerator

Error code 15 8 00 on a Sub-Zero refrigerator indicates that the ice maker relay on the control board is stuck in the open position, which cuts off electrical power to the ice maker entirely. A relay is an electrically operated switch that the control board uses to send power to downstream components. When the ice maker relay fails in the open state, the circuit remains broken regardless of demand signals from the control board, and the ice maker receives no voltage to operate its motor, heater, or harvest cycle components.

The root cause of this fault is typically internal failure of the relay itself, which is soldered onto the main control board. Relays can fail due to contact oxidation, coil burnout, or mechanical fatigue from repeated cycling over years of operation. Because the relay is an integrated component of the control board assembly rather than a separately serviceable part, the prescribed repair is full control board replacement. Attempting to resolder or substitute an individual relay is generally not a supported repair path for this platform.

Before replacing the control board, it is important to confirm that the relay is genuinely stuck open rather than responding to a wiring fault or a disconnected ice maker harness. Inspect the wiring connections between the control board and the ice maker for damage, corrosion, or loose pins. If wiring integrity checks out and the ice maker still receives no power during a call for ice, the control board is the confirmed failed component and should be replaced to restore ice maker function.

Source: manufacturer service documentation.

Common causes of 15 8 00

  1. 01

    Failed ice maker relay on control board

    Part replacement

    The relay responsible for powering the ice maker has failed internally in the open position. This is the most common cause of this code and requires replacement of the entire control board.

  2. 02

    Damaged wiring harness to ice maker

    Wiring / connection

    A broken, corroded, or disconnected wire between the control board and the ice maker can mimic a stuck-open relay by interrupting power delivery. Inspect the harness connectors and wire routing for visible damage before condemning the board.

  3. 03

    Control board connector corrosion

    Wiring / connection

    Moisture or frost intrusion near the control board can cause pin corrosion at the harness connectors, creating high-resistance or open connections that trigger this fault code. Clean or reseat connectors as part of diagnosis.

  4. 04

    Control board power supply issue

    Part replacement

    A broader failure in the control board's internal power regulation can prevent relay coil activation, causing the relay to appear stuck open. If multiple components are faulting simultaneously, board-level power failure may be the cause.

See the test procedure for each cause

Frequently asked questions about 15 8 00

What does 15 8 00 mean on a Sub-Zero refrigerator?
Error code 15 8 00 means the ice maker relay on the control board is stuck in the open position, cutting off all power to the ice maker. The relay is a switching component on the main control board that is responsible for delivering voltage to the ice maker during operation. With the relay stuck open, the ice maker cannot run its motor, heater, or harvest cycle. Resolving this code requires replacing the control board.
Can I fix error code 15 8 00 myself, or do I need a technician?
A knowledgeable DIYer can inspect wiring harnesses and connectors between the control board and ice maker as a first step. However, if those check out, the repair requires replacing the control board, which involves working with the refrigerator's electrical system and properly seating multi-pin harness connectors. If you are not comfortable with appliance electrical repairs, a qualified technician is recommended to ensure the board is installed and connected correctly.
Is it safe to keep using my refrigerator when error 15 8 00 is active?
Yes, this error code affects only the ice maker circuit and does not impact the refrigerator or freezer cooling functions. Your food and frozen items remain at safe temperatures while this fault is present. The only consequence of leaving it unrepaired is that the ice maker will not produce ice until the control board is replaced.
How much does it cost to repair error code 15 8 00 on a Sub-Zero refrigerator?
The primary repair for this fault is control board replacement. Control board parts for Sub-Zero refrigerators typically range from $200 to $600 or more depending on the specific model. Adding professional labor, total repair costs commonly fall in the range of $350 to $900. Costs vary based on your location, service provider, and the exact unit model.
Will resetting my Sub-Zero refrigerator clear error code 15 8 00?
A power reset may temporarily clear the fault code from the display, but it will not repair the underlying hardware failure. Because the ice maker relay is physically stuck open on the control board, the fault condition persists and the code will return once the refrigerator runs its diagnostics again. A lasting repair requires control board replacement rather than a reset.

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