Sub-Zero Refrigerator Error Code 15 3 01

Error code 15 3 01 means the Zone 3 compressor relay is stuck in the closed position, causing 120 volts AC to be delivered to the compressor continuously rather than in controlled cycles. This is a control board relay failure. The compressor runs without stopping, which can lead to component damage if not addressed promptly.

A continuously running compressor is not an immediate safety emergency in most cases, but it does pose risks over time. Uninterrupted compressor operation can cause overheating, compressor motor burnout, and excessive wear on refrigerant system components. Addressing the fault promptly prevents the need for more extensive and costly repairs down the line.

A power reset will not clear error code 15 3 01 if the underlying relay failure persists. Because the relay contacts are physically welded or fused closed, cycling power to the unit does not change the hardware fault state. The error will return immediately upon restart, and the compressor will continue running constantly until the control board is replaced.

The primary repair for this error is replacing the control board, which involves working with 120V AC circuits and precise component handling. Technicians with appliance electrical experience can perform this repair, but homeowners unfamiliar with line-voltage circuits should contact a qualified appliance service technician. Before replacing the board, confirming that 120V is continuously present at the compressor helps verify the diagnosis.

Repair costs depend on whether the issue is resolved by replacing the control board or involves additional components such as wiring or the compressor itself. Control board replacement on Sub-Zero units typically falls in the range of $400 to $900 or more, including parts and labor. If the continuously running compressor has caused secondary damage, total repair costs could be higher.