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Error code reference

Sub-Zero Freezer Error Code --

Unit is in shutdown mode; all unit functions suspended except lights and door alarm.

Sub-Zero codesSub-Zero freezer codes

Unit is in shutdown mode; all unit functions suspended except lights and door alarm.

First step from the service manual

Press the COLDER key to end shutdown mode and start the unit.

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

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What -- means on a Sub-Zero freezer

The double dash (--) display on a Sub-Zero freezer indicates the unit has entered shutdown mode. In this state, all primary refrigeration functions are suspended, including the compressor, evaporator fan, and temperature control systems. The only systems that remain active during shutdown mode are the interior lights and the door alarm. This is a deliberate operational state rather than a fault condition, meaning the unit has not detected a component failure but has instead been commanded to halt cooling operations.

Shutdown mode is typically engaged intentionally through the control panel, often when a unit is being cleaned, stored, or temporarily taken out of service. It can also be entered accidentally by a button press sequence on the control panel. Because the compressor and fans are completely off, the interior temperature will rise over time, making it important to address the condition promptly if the unit contains perishable items.

To exit shutdown mode, pressing the COLDER key on the control panel will restart all unit functions and return the freezer to normal operation. If the unit does not respond to the COLDER key press, further investigation of the control board or keypad may be needed. No component failure or refrigerant issue is implied by this display on its own.

Source: manufacturer service documentation.

Common causes of --

  1. 01

    Intentional shutdown via control panel

    Wiring / connection

    The most common cause is a deliberate activation of shutdown mode, typically done before cleaning the unit or taking it out of service temporarily. This is a normal operational state and requires no repair.

  2. 02

    Accidental button press

    Wiring / connection

    A sequence of accidental keypresses on the control panel can engage shutdown mode without the user intending to do so. Checking recent interactions with the control panel and simply pressing COLDER will resolve this.

  3. 03

    Power cycle or control board reset

    Wiring / connection

    In some cases, a power interruption or control board reset may cause the unit to return in shutdown mode rather than resuming normal operation. Pressing the COLDER key after restoring power should bring the unit back online.

  4. 04

    Unresponsive or faulty keypad

    Part replacement

    If the COLDER key does not successfully exit shutdown mode, the membrane keypad or control board may have a fault preventing the command from registering. Testing key response and inspecting for damage to the keypad assembly would be the next diagnostic step.

  5. 05

    Control board failure

    Part replacement

    If the unit remains in shutdown mode despite a functional keypad and correct button presses, a failed control board may be unable to process the command to restart refrigeration. This would require board inspection and possible replacement.

See the test procedure for each cause

Frequently asked questions about --

What does -- mean on a Sub-Zero freezer?
The -- display on a Sub-Zero freezer means the unit is in shutdown mode. All cooling functions, including the compressor and fans, are suspended while the lights and door alarm remain active. This is a commanded state, not a fault code, and the unit has not detected a component failure. Pressing the COLDER key on the control panel will exit shutdown mode and restore normal operation.
How do I fix the -- display on my Sub-Zero freezer?
Press the COLDER key on the control panel to end shutdown mode and restart all unit functions. The display should return to a temperature reading and the compressor should begin operating within a short time. If the COLDER key does not respond, inspect the keypad for damage or contact a technician to evaluate the control board.
Is it safe to leave food in my Sub-Zero freezer when it shows --?
Because shutdown mode disables all cooling, the freezer interior will gradually warm up while the unit is in this state. Food safety depends on how long the unit has been in shutdown mode and how full the freezer is. If the unit has been in shutdown mode for more than a couple of hours, check internal temperatures before assuming food is still safe. Exit shutdown mode immediately to restore cooling.
Will resetting my Sub-Zero freezer clear the -- display?
The correct way to clear the -- display is to press the COLDER key, which is the designated control to exit shutdown mode. A full power reset by unplugging the unit or cycling the breaker may also work, but the unit could return in shutdown mode depending on the cause. The COLDER key press is the first and simplest step to try.
How much does it cost to repair a Sub-Zero freezer stuck in shutdown mode?
If the issue is simply an accidental activation of shutdown mode, there is no repair cost since pressing the COLDER key resolves it. If the cause is a faulty keypad, replacement parts and labor typically range from $150 to $400 depending on the model and service provider. A failed control board is a more significant repair, generally ranging from $400 to $900 or more including parts and labor for a Sub-Zero unit.

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