Sub-Zero Designer Code 10-3-00: Zone 3 sensor open

What 10-3-00 means

On Sub-Zero Designer units like the DET3050CI and DEC3050R, 10-3-00 means the zone 3 sensor reads open. On Classic BI models such as the BI-36U/S and BI-48SD/S, the same code refers to the condenser sensor reading open. An open reading means the control sees no signal at all, so it cannot judge the temperature of that zone or condenser. Depending on the platform, cooling may become erratic or the unit may protect itself by limiting operation.

Common causes of 10-3-00

Sensor open in zone 3 or at the condenser
Broken wire or disconnected plug
Corroded connection

✓ One safe check you can try

1) Copy the code exactly as displayed, including the dashes. 2) On a Designer unit, check zone 3 with a thermometer morning and evening. 3) On a Classic BI, keep the grille clear and free of dust. 4) Restart power at the breaker. 5) Book service if 10-3-00 remains after the restart.

! Why to stop there

Sensors are located behind panels or in the machine compartment.
Testing requires resistance checks.
Wiring must be repaired properly.

Opening a panel yourself does not automatically cancel a manufacturer warranty, but it can cause accidental damage, and some manufacturers set their own service conditions. Check your warranty terms, or ask us, before deciding.

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Other Refrigerator codes

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10-3-0010-3-00 questions

Is 10-3-00 different on Designer and Classic BI?

Yes. On Designer units such as the DET3050CI it is the zone 3 sensor reading open. On Classic BI units it is the condenser sensor reading open, in the machine compartment.

Is cooling affected?

It can be. The control loses a reading it relies on, so zone 3 temperatures on a Designer, or condenser management on a Classic BI, may become less accurate.

What will the visit for 10-3-00 include?

We test the right sensor and wiring for your platform, then replace the sensor or repair the break. You approve a written price before we start.