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Error code reference

Sub-Zero Wine Storage Error Code 15 2 01

Zone 2 compressor relay stuck closed; 120V to compressor at all times.

Sub-Zero codesSub-Zero wine storage codes

Zone 2 compressor relay stuck closed; 120V to compressor at all times.

First step from the service manual

Verify and replace control board.

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

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  • Step-by-step tests with expected resistance, voltage, and continuity values
  • Wiring diagram references and connector pinouts from the OEM service manual
  • Verified part numbers when replacement is required
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What 15 2 01 means on a Sub-Zero wine storage

Error code 15 2 01 on a Sub-Zero wine storage unit indicates that the Zone 2 compressor relay has become stuck in the closed position, meaning 120V is being continuously supplied to the Zone 2 compressor. Under normal operation, the control board cycles the compressor relay open and closed to regulate temperature within the zone. When the relay welds shut or fails in the closed state, the compressor receives constant power regardless of the zone's cooling demand, removing all temperature regulation for that circuit.

A relay stuck closed is a control board-level failure. The relay itself is a component soldered onto or integrated within the control board assembly, and when it fails in this manner, the fault cannot be resolved by resetting or reconfiguring the unit. Continuous compressor operation can lead to overcooling, compressor wear, and potential damage to wine stored in Zone 2. The control board is the primary suspect and the first component to address in the diagnostic process.

This fault is distinct from sensor or thermistor errors. The code specifically identifies a relay state condition rather than a temperature reading anomaly, meaning the board is either internally reporting the relay as closed when it should not be, or the relay has physically welded. Either condition requires control board replacement to restore proper cycling behavior and protect both the compressor and the stored contents.

Source: manufacturer service documentation.

Common causes of 15 2 01

  1. 01

    Failed relay on control board

    Part replacement

    The relay responsible for switching power to the Zone 2 compressor has welded its contacts closed, making it impossible for the board to cut power to the compressor. This is the primary cause and requires control board replacement.

  2. 02

    Control board internal circuit failure

    Part replacement

    Beyond the physical relay contacts, an internal driver circuit on the control board may have failed in a state that holds the relay coil energized at all times. Inspecting the board for burned components or heat damage near the relay area can help confirm this.

  3. 03

    Electrical surge or voltage spike damage

    Part replacement

    A power surge can cause relay contacts to weld together or damage the relay driver circuitry on the board. Check whether the unit is connected to surge protection and inspect the board for visible burn marks.

  4. 04

    Prolonged relay cycling wear

    Part replacement

    Over years of operation, relay contacts can degrade and eventually fuse in the closed position due to repeated arcing. This is more common in older units and typically presents without any prior warning codes.

See the test procedure for each cause

Frequently asked questions about 15 2 01

What does 15 2 01 mean on a Sub-Zero wine_storage?
Error code 15 2 01 means the Zone 2 compressor relay is stuck in the closed position, causing 120V to be supplied to the Zone 2 compressor continuously. This prevents normal temperature cycling in that zone. The control board is the source of the fault and must be replaced to resolve it.
Can I fix error code 15 2 01 myself, or do I need a technician?
Resolving this code requires replacing the control board, which involves working with 120V wiring and board-level components. While a knowledgeable DIYer with experience in appliance repair may be able to complete the swap, the job is generally better suited to a certified technician to ensure safe handling of line voltage and correct board installation.
Is it safe to keep using my wine storage unit while error 15 2 01 is active?
Continued use is not recommended. With the compressor running constantly, Zone 2 will overcool and lose all temperature regulation, which can damage wine stored in that zone. There is also added wear on the compressor from continuous operation. The unit should be inspected and repaired promptly.
Will resetting the unit clear error code 15 2 01?
No. This error reflects a hardware failure in the control board relay, not a temporary software or sensor glitch. Resetting the unit will not restore proper relay function or clear the fault. The control board must be replaced before the error will resolve.
How much does it cost to repair error code 15 2 01 on a Sub-Zero wine storage unit?
Repair costs depend on parts and labor rates in your area. A replacement control board for a Sub-Zero wine storage unit typically ranges from several hundred to over a thousand dollars for the part alone, with additional labor costs on top of that. Getting a quote from an authorized Sub-Zero service provider will give you the most accurate estimate for your specific model.

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