Sub-Zero Designer and Classic BI Code 35-3-00: open fan circuit, Zone 3 or condenser

What 35-3-00 means

Code 35-3-00 means different things on two Sub-Zero platforms. On current Designer models such as the DET3050CI and DEC3050R, it reports an open circuit on the Zone 3 fan. On Classic Built-In units like the BI-36U/S and BI-48SD/S, the same digits report the condenser fan circuit open. On Designer, Zone 3 may lose airflow and warm. On the Classic BI, heat cannot be cleared from the machine compartment properly, so the whole unit can lose cooling.

Common causes of 35-3-00

A loose plug at the Zone 3 fan (Designer) or condenser fan (BI)
A wire broken in the fan harness
A fan motor with an open winding
A board output not reaching the fan

✓ One safe check you can try

1. Confirm which platform you have from the model number on the rating plate. 2. On a Classic BI, clear and vacuum the grille. 3. On Designer, keep the Zone 3 rear vents free. 4. Reset the breaker once. 5. Check temperatures and move food if they rise.

! Why to stop there

The condenser fan sits in the machine compartment near hot tubing
The Zone 3 fan is behind an evaporator cover
Both need live circuit tests to find the open point

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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35-3-0035-3-00 questions

Why does 35-3-00 mean different things?

Designer and Classic BI number their fans differently. On Designer, 3 is the third zone's fan. On the Classic BI it is the condenser fan. We read your model number first.

Which version is more urgent?

On a Classic BI, a stopped condenser fan can affect cooling in both sections, so act quickly. On Designer, only Zone 3 is affected at first.

What happens during the visit?

We check the plug, harness and motor for the fan your platform names, fix what is open, and confirm airflow. You get a written price first and a 30-day workmanship warranty.