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Error code reference

Sub-Zero Refrigerator Error Code 15 9 01

Auger relay is stuck closed; power to auger at all times.

Sub-Zero codesSub-Zero refrigerator codes

Auger relay is stuck closed; power to auger at all times.

First step from the service manual

Verify auger relay is stuck closed. 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 9 01 means on a Sub-Zero refrigerator

Error code 15 9 01 on a Sub-Zero refrigerator indicates that the auger relay has become stuck in the closed position, which means the auger motor is receiving continuous power regardless of any control signals. The auger is the spiral-shaped mechanism inside the ice maker that drives ice from the storage bin toward the dispenser. Under normal operation, the control board opens and closes the auger relay on demand, energizing the motor only when ice dispensing is requested. When the relay welds shut or fails closed, that switching ability is lost entirely.

A relay stuck closed typically results from contact welding, which occurs when excessive current causes the internal relay contacts to fuse together. This can happen due to a surge event, a motor load that drew more amperage than the relay was rated to handle, or simple wear over repeated switching cycles. The constant power to the auger motor may cause it to run continuously, leading to mechanical wear, unusual noise from the dispenser area, or ice being driven forward when no dispense command has been issued.

Because the relay is integrated into the control board assembly rather than being a serviceable standalone component, the diagnostic path is straightforward: confirm the relay failure by checking whether the auger motor runs without a dispense command, then replace the control board. There is no field repair for a welded relay contact. Once the board is replaced, the new relay will respond correctly to control signals and the error should not return unless an underlying overcurrent condition is present.

Source: manufacturer service documentation.

Common causes of 15 9 01

  1. 01

    Welded relay contacts on the control board

    Part replacement

    The relay contacts on the control board have fused together due to heat or electrical arcing, keeping the circuit permanently closed. This is the primary cause and requires control board replacement since the relay is not a separate serviceable part.

  2. 02

    Electrical surge or overcurrent event

    Part replacement

    A power surge or a momentary overcurrent draw from the auger motor can generate enough heat to weld the relay contacts shut. Inspect the auger motor for signs of binding or stalling, which could have caused the excessive current draw.

  3. 03

    Worn relay contacts from extended use

    Part replacement

    Over thousands of switching cycles, relay contacts gradually erode and can eventually fuse together. This is more common on older units and is a normal end-of-life failure mode for the relay component on the board.

  4. 04

    Auger motor drawing excessive amperage

    Wiring / connection

    If the auger motor itself is failing or mechanically obstructed, it may draw higher-than-normal current through the relay on every cycle, accelerating contact wear and increasing the likelihood of contact welding. Verify the auger turns freely before installing a new control board.

See the test procedure for each cause

Frequently asked questions about 15 9 01

What does 15 9 01 mean on a Sub-Zero refrigerator?
Error code 15 9 01 means the auger relay on the control board is stuck in the closed position, causing continuous power to be sent to the auger motor in the ice dispenser. Normally the relay opens and closes based on dispense commands, but a failed relay keeps the circuit permanently energized. The control board must be replaced to resolve this fault.
Can I fix error code 15 9 01 myself, or do I need a technician?
The repair requires replacing the control board, which involves working with the refrigerator's electrical system. A knowledgeable DIYer comfortable with appliance disassembly and basic electrical safety can perform this repair, but it is important to disconnect power before beginning. If you are not comfortable working around appliance wiring, a qualified technician is recommended. Before ordering a board, also check that the auger motor spins freely so a mechanical obstruction is not contributing to the problem.
Is it safe to keep using the refrigerator while error 15 9 01 is active?
Continuous power to the auger motor means it may run without stopping, which can cause the motor to overheat and wear out prematurely. While this fault does not immediately affect food safety or cooling, leaving it unaddressed risks secondary damage to the auger motor and dispenser components. It is best to address the control board replacement promptly to avoid additional repair costs.
How much does it cost to fix error code 15 9 01 on a Sub-Zero refrigerator?
The primary repair is control board replacement. Sub-Zero control boards are premium components, and parts alone typically range from $200 to $600 or more depending on the specific model. If you hire a technician, total repair costs including labor generally range from $350 to $900. Prices vary by region, service provider, and the exact board required for your unit.
Will resetting the refrigerator clear error code 15 9 01?
No, a power reset will not clear this error. Error 15 9 01 is caused by a physical relay failure on the control board, meaning the relay contacts are mechanically fused and cannot be restored by cycling power. The fault will return immediately after a reset because the underlying hardware defect remains. Replacing the control board is the only way to permanently resolve this error code.

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