Sub-Zero Designer Code 10-3-01: Zone 3 thermistor shorted

What 10-3-01 means

On Designer models such as the DET3050CI tall refrigerator and the DEC3050R column, 10-3-01 tells us the zone 3 sensor is shorted. Classic BI owners with a BI-36U/S or BI-48SD/S will see the same digits, but there it means the condenser sensor is shorted. A shorted thermistor sends a reading far outside the normal range, so the control discards it. On Designer units zone 3 may drift off its setting; on a Classic BI the unit loses its view of condenser temperature and may run less efficiently.

Common causes of 10-3-01

Shorted thermistor in zone 3 or at the condenser
Chafed sensor lead touching metal
Water in the sensor connector

✓ One safe check you can try

1) Confirm which platform you own from the model tag inside the door. 2) On a Designer unit, check zone 3 with a thermometer twice a day. 3) On a Classic BI, keep the top grille clear of clutter. 4) Turn power off at the breaker for a minute and restore it. 5) Arrange service if 10-3-01 remains.

! Why to stop there

The sensor may sit in the cabinet wall or beside condenser wiring.
Confirming a short means comparing resistance with a temperature table.
A chafed lead must be repaired so it cannot rub through again.

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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10-3-0110-3-01 questions

How do I know which meaning applies to my unit?

Check the model tag. Designer models such as the DET3050CI or DEC3050R read 10-3-01 as the zone 3 sensor shorted. Classic BI models read it as the condenser sensor shorted.

Can I keep using the refrigerator?

Usually yes for a short period. Watch temperatures with a thermometer, keep doors closed, and book a visit before small swings turn into spoiled food.

What will the technician do?

We locate the right sensor for your platform, measure it and its wiring, and replace or repair what failed. A written price comes first, and we back our labor for 30 days.