mypros+
Error code reference

Sub-Zero Refrigerator Error Code 35 A 00

Air filter fan open circuit detected.

Sub-Zero codesSub-Zero refrigerator codes

Air filter 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.

MyPros+ Max

Get the full diagnostic procedure for 35 A 00.

  • Step-by-step tests with expected resistance, voltage, and continuity values
  • Wiring diagram references and connector pinouts from the OEM service manual
  • Verified part numbers when replacement is required
Get the full procedure

$29/month · Cancel anytime · Or $9.95 3-day pass

What 35 A 00 means on a Sub-Zero refrigerator

Error code 35 A 00 on a Sub-Zero refrigerator indicates an open circuit condition detected in the air filter fan circuit. An open circuit means the control board is sending power to the fan motor but receiving no return signal or detecting a complete break in the electrical path. This could involve the fan motor winding itself, the wiring harness connecting the fan to the control board, or a failed connector along the circuit path.

The air filter fan is responsible for drawing air through the unit's built-in air purification filter, helping to circulate and clean the air inside the refrigerator compartment. When the control board cannot confirm the fan is operating due to an open circuit, it logs this fault code. The diagnostic process begins by inspecting the control board for visible damage such as burnt traces or failed components, and then physically checking the fan motor and its wiring.

Common causes include a seized or burned-out fan motor with a broken internal winding, a disconnected or corroded wiring harness, or a damaged connector at either the fan end or the control board header. In some cases, the control board itself may have failed and is misreading the circuit. Technicians should verify continuity through the entire fan circuit before condemning any single component.

Source: manufacturer service documentation.

Common causes of 35 A 00

  1. 01

    Failed air filter fan motor

    Part replacement

    The fan motor winding may have broken internally, creating an open circuit. This can be confirmed by checking continuity across the motor terminals, a good motor will show continuity while a failed motor will not.

  2. 02

    Disconnected or damaged wiring harness

    Wiring / connection

    The wire harness running between the fan motor and the control board may have become disconnected, pinched, or broken. Visually trace the harness and check each connector for secure seating and signs of chafing or damage.

  3. 03

    Corroded or loose connector

    Wiring / connection

    Moisture inside the refrigerator cabinet can cause connector pins to corrode, increasing resistance or breaking continuity entirely. Inspect connectors at both the fan motor and the control board header for oxidation or looseness.

  4. 04

    Failed control board

    Part replacement

    The control board may have a damaged output circuit for the air filter fan, causing it to incorrectly report an open circuit even when the fan and wiring are intact. This is typically diagnosed after the fan and harness have been ruled out.

  5. 05

    Blown thermal fuse or overload protector on fan circuit

    Part replacement

    Some fan assemblies include a thermal fuse or overload protector that can open permanently if the motor overheats. Check for this component in the fan circuit and test it for continuity.

See the test procedure for each cause

Frequently asked questions about 35 A 00

What does 35 A 00 mean on a Sub-Zero refrigerator?
Error code 35 A 00 means the control board has detected an open circuit in the air filter fan circuit. The air filter fan circulates air through the refrigerator's built-in purification filter. The control board expects to see a complete electrical circuit when powering this fan, and this code appears when that circuit is broken. The first diagnostic steps involve inspecting the control board and the fan motor with its associated wiring.
Can I fix error code 35 A 00 myself?
Some basic checks can be performed by a knowledgeable DIYer, such as verifying that the fan wiring connectors are fully seated and free of corrosion. However, testing motor continuity and diagnosing a failed control board typically require a multimeter and familiarity with electrical components. If you are not comfortable working with appliance wiring, it is best to contact a certified Sub-Zero technician.
Is error code 35 A 00 a safety concern?
This error is not an immediate safety hazard in terms of fire or injury risk. However, a non-functioning air filter fan means the refrigerator's air purification system is not operating, which can affect food freshness over time. Food cooling performance is handled by separate components, so the refrigerator may continue to cool normally while this fault is present.
How much does it cost to repair error code 35 A 00 on a Sub-Zero refrigerator?
Repair costs vary depending on the failed component. Replacing the air filter fan motor typically runs in the range of $100 to $300 including parts and labor. If the control board requires replacement, costs can range from $400 to $800 or more depending on the model. A diagnostic service call from a qualified technician will help identify the exact cause before committing to a repair cost.
Will resetting my Sub-Zero refrigerator clear error code 35 A 00?
A reset may temporarily clear the code from the display, but it will return if the underlying open circuit condition has not been repaired. The control board will re-detect the fault the next time it attempts to operate the air filter fan. Resetting the unit is useful for confirming whether the fault is intermittent, but it is not a substitute for diagnosing and correcting the root cause.

Related Sub-Zero refrigerator codes

All Sub-Zero refrigerator codes
View all 296 Sub-Zero refrigerator codes

78,000+ service manuals · 160,000+ error codes · 55+ brands

Get Started

$29/month · Cancel anytime · Or $9.95 3-day pass