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Error code reference

Sub-Zero Refrigerator Error Code 35 1 00

Zone 1 evaporator fan open circuit detected.

Sub-Zero codesSub-Zero refrigerator codes

Zone 1 evaporator fan open circuit detected.

First step from the service manual

Check control board and fan.

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

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What 35 1 00 means on a Sub-Zero refrigerator

Error code 35 1 00 on a Sub-Zero refrigerator indicates that the control board has detected an open circuit condition in the Zone 1 evaporator fan circuit. An open circuit means the electrical path to the fan motor is broken, preventing current from flowing and stopping the fan from operating. Zone 1 refers to the primary refrigeration compartment evaporator section, where the fan is responsible for circulating cold air across the evaporator coils and distributing it throughout the refrigerator cabinet.

The control board monitors the fan motor's electrical circuit continuously. When it detects that the circuit is open, rather than reading expected resistance or current draw from a functioning motor, it triggers this fault code. Common root causes include a failed fan motor with an internally open winding, a broken or disconnected wiring harness connector between the fan and the control board, or damaged wiring that has developed a break in the conductor.

Diagnosis should begin at the control board and the fan motor itself, as the first diagnostic step directs. A technician should inspect the wiring harness for visible damage, corrosion, or loose connections, then test the fan motor windings with a multimeter to check for continuity. A reading of infinite resistance (OL) across the motor terminals confirms an open winding and a failed motor. If the motor tests good, the wiring and the control board output for that fan circuit should be evaluated further.

Source: manufacturer service documentation.

Common causes of 35 1 00

  1. 01

    Failed evaporator fan motor

    Part replacement

    The fan motor itself may have developed an open winding internally, breaking the electrical circuit. Testing the motor terminals with a multimeter for continuity will confirm this; an OL (infinite resistance) reading indicates the motor has failed.

  2. 02

    Disconnected or loose wiring connector

    Wiring / connection

    The wiring harness connector linking the fan motor to the control board may have vibrated loose or become fully disconnected. Visually inspecting and reseating all connectors in the fan circuit can quickly identify this issue.

  3. 03

    Damaged or broken wiring

    Part replacement

    A wire in the fan circuit may have developed a break due to chafing, pinching, or freezing conditions near the evaporator. Careful inspection of the harness routing and continuity testing of individual wires will reveal any broken conductors.

  4. 04

    Faulty control board

    Part replacement

    If the fan motor and all wiring test correctly, the control board itself may have a failed output circuit for the Zone 1 evaporator fan. This is less common but possible, and the board should be evaluated after ruling out the fan and wiring.

See the test procedure for each cause

Frequently asked questions about 35 1 00

What does 35 1 00 mean on a Sub-Zero refrigerator?
Error code 35 1 00 indicates that the control board has detected an open circuit in the Zone 1 evaporator fan circuit. This means the electrical path to the fan motor is broken and the fan is not operating. As a result, cold air may not circulate properly in the refrigerator compartment. The fault requires inspection of the fan motor and its wiring to locate the source of the open circuit.
Can I fix error code 35 1 00 myself?
A knowledgeable DIYer can start by checking for any visibly loose or disconnected wiring connectors at the evaporator fan and reseating them, which sometimes resolves the fault. However, if the fan motor itself has failed or wiring is damaged inside the unit, replacing components in a Sub-Zero refrigerator can be complex and may be better handled by a certified technician. Testing motor windings and control board outputs requires a multimeter and some familiarity with refrigerator electrical systems.
Is it safe to keep using my refrigerator when error code 35 1 00 is active?
Continuing to run the refrigerator with this fault active is not recommended for extended periods. Without the Zone 1 evaporator fan circulating air, the refrigerator compartment will not maintain safe food storage temperatures. Food spoilage is a real risk, and the compressor may also work harder than normal. Addressing the fault promptly is the safest course of action.
How much does it cost to repair error code 35 1 00 on a Sub-Zero refrigerator?
Repair costs vary depending on the root cause. If only a wiring connector needs to be reseated, a service call fee may be the primary expense, typically in the range of $100 to $200. A replacement evaporator fan motor generally costs between $50 and $200 for the part, plus labor. If the control board is at fault, board replacement on Sub-Zero units can range from $300 to $700 or more including parts and labor.
Will resetting my Sub-Zero refrigerator clear error code 35 1 00?
Resetting the refrigerator may temporarily clear the displayed code, but it will return if the underlying open circuit condition in the fan circuit has not been resolved. A reset does not repair a failed fan motor, broken wire, or faulty control board. The fault code will reappear once the control board cycles through its diagnostics and detects the open circuit again.

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