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Error code reference

Sub-Zero Refrigerator Error Code 15 8 01

Ice maker relay is stuck closed; power to ice maker at all times.

Sub-Zero codesSub-Zero refrigerator codes

Ice maker relay is stuck closed; power to ice maker at all times.

First step from the service manual

Verify ice maker 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 8 01 means on a Sub-Zero refrigerator

Error code 15 8 01 on a Sub-Zero refrigerator indicates that the ice maker relay on the control board is stuck in the closed position. Under normal operation, this relay opens and closes to cycle power to the ice maker on demand. When the relay welds or fuses shut, it delivers continuous, uninterrupted power to the ice maker rather than controlling it in timed cycles. This results in the ice maker receiving power at all times regardless of whether the harvest cycle has been completed or whether the ice bin is full.

The relay itself is a mechanical switching component located on the main control board. Relay contacts can fuse together due to repeated electrical arcing, voltage spikes, or a short circuit condition within the ice maker circuit. When the contacts weld closed, the relay can no longer interrupt current flow, and the board's control logic loses the ability to manage ice maker operation. This can cause the ice maker to run continuously, overfill the ice bin, or create frost buildup in the freezer compartment.

Because the relay is physically part of the control board assembly, it is not serviceable as a standalone component. The diagnostic approach is to confirm the relay is stuck closed by verifying that constant power is present at the ice maker even when it should be off, then replace the entire control board. Inspecting the ice maker itself for a wiring short that may have contributed to the relay failure is also advisable before installing a new board.

Source: manufacturer service documentation.

Common causes of 15 8 01

  1. 01

    Welded relay contacts on control board

    Part replacement

    The relay contacts on the control board have fused together due to electrical arcing or a voltage spike, preventing them from opening. This is the primary cause and requires control board replacement.

  2. 02

    Voltage spike or power surge

    Part replacement

    A surge in line voltage can cause relay contacts to arc and weld shut during switching. If the home has experienced power fluctuations, this is a likely contributing factor.

  3. 03

    Short circuit in the ice maker wiring

    Wiring / connection

    A wiring short in the ice maker circuit can draw excess current through the relay, causing it to overheat and fail in the closed position. Inspect the ice maker wiring harness for damaged insulation or pinched wires before replacing the board.

  4. 04

    Failed ice maker unit drawing excessive current

    Part replacement

    An internally failing ice maker motor or heater can draw abnormally high current, stressing the relay over time until it fails closed. Testing the ice maker for proper resistance values can help identify this condition.

See the test procedure for each cause

Frequently asked questions about 15 8 01

What does 15 8 01 mean on a Sub-Zero refrigerator?
Error code 15 8 01 means the ice maker relay on the control board is stuck in the closed position, delivering constant power to the ice maker. Normally this relay cycles on and off to control ice production. When it fails closed, the ice maker runs continuously without the control board being able to stop it. Resolving this error requires replacing the control board.
Can I fix error code 15 8 01 myself?
The fix for this error is replacing the main control board, since the failed relay is not a separately replaceable component. A knowledgeable DIYer comfortable with disassembling appliance panels and working with electrical components may be able to perform this replacement. However, it is important to also inspect the ice maker wiring for any shorts that may have caused the relay to fail before installing a new board. If you are unsure, a certified appliance technician is recommended.
Will resetting my Sub-Zero refrigerator clear error code 15 8 01?
No, a reset will not clear error code 15 8 01. The underlying cause is a physical hardware failure: the relay contacts are mechanically welded shut and cannot be restored by cycling power. The control board must be replaced to resolve the fault.
Is it safe to keep using my Sub-Zero refrigerator when error code 15 8 01 is active?
Running the refrigerator with this error active means the ice maker is receiving continuous power, which can lead to overfilling of the ice bin, excess frost buildup in the freezer, and additional wear on the ice maker components. It is advisable to turn the ice maker off manually or disconnect it until the control board is replaced to prevent further issues.
How much does it cost to repair error code 15 8 01 on a Sub-Zero refrigerator?
Repair costs for this error vary based on parts and labor rates in your area. Control board replacement on a Sub-Zero refrigerator typically falls in the range of $400 to $900 or more when accounting for the part and professional labor. Sub-Zero parts tend to be priced at a premium compared to standard appliance brands, so obtaining a quote from an authorized service provider before proceeding is recommended.

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