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Error code reference

Sub-Zero Refrigerator Error Code 35 C 33

DC condenser fan speed set too low

Sub-Zero codesSub-Zero refrigerator codes

DC condenser fan speed set too low - the fan is running faster than its setting.

First step from the service manual

Verify fan not shorted.

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

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What 35 C 33 means on a Sub-Zero refrigerator

Error code 35 C 33 on a Sub-Zero refrigerator indicates that the DC condenser fan is operating at a speed higher than its programmed set point. The control board continuously monitors fan motor speed through a feedback signal, typically a tachometer or pulse signal from the fan motor itself. When the actual speed exceeds the commanded speed by a defined threshold, the board logs this fault. This is not a simple stall or no-spin condition, but rather an overspeed fault where the fan is spinning faster than the controller expects.

The first diagnostic step is to check whether the condenser fan motor or its wiring has a short circuit. A shorted winding or a short in the fan circuit can cause erratic current draw and abnormal speed behavior. Inspect the fan motor leads and connector for signs of insulation damage, pinched wires, or contact with the condenser housing. Measure resistance across the motor windings to rule out an internal short.

Beyond a direct short, this fault can also stem from a failing fan motor that has lost its ability to regulate speed properly, a defective control board sending an incorrect speed command, or a damaged tachometer feedback circuit that is reporting inaccurate speed data to the controller. Because the condenser fan is critical for heat rejection, leaving this fault unresolved can lead to elevated condenser temperatures and compromised refrigeration performance.

Source: manufacturer service documentation.

Common causes of 35 C 33

  1. 01

    Shorted fan motor winding or wiring

    Part replacement

    A short in the condenser fan motor windings or its connecting wires can cause uncontrolled speed behavior. Inspect the wiring harness for damaged insulation and check winding resistance at the motor terminals.

  2. 02

    Faulty fan motor losing speed regulation

    Part replacement

    A worn or failing DC fan motor may lose the ability to self-regulate, causing it to spin beyond its commanded set point. Replacing the motor typically resolves this condition.

  3. 03

    Inaccurate tachometer or speed feedback signal

    Part replacement

    The control board relies on a feedback signal from the fan motor to verify speed. If the tachometer circuit is damaged or sending incorrect pulses, the board may log an overspeed fault even when the motor appears functional.

  4. 04

    Control board sending incorrect speed command

    Part replacement

    A defective control board may output a speed set point signal that does not match operating parameters, causing the fan to run at the wrong speed. This is diagnosed after ruling out the fan motor and wiring.

  5. 05

    Loose or corroded connector at the fan motor

    Wiring / connection

    A poor electrical connection at the fan motor connector can introduce resistance or signal noise that disrupts speed control communication. Inspect and reseat all connectors in the condenser fan circuit.

See the test procedure for each cause

Frequently asked questions about 35 C 33

What does 35 C 33 mean on a Sub-Zero refrigerator?
Error code 35 C 33 means the DC condenser fan is running faster than its programmed speed setting. The control board detected a mismatch between the commanded fan speed and the actual operating speed. This fault points to a problem in the condenser fan circuit, including the motor itself, its wiring, or the control board.
How do I fix error code 35 C 33 on my Sub-Zero refrigerator?
Start by inspecting the condenser fan motor and its wiring for any shorts, damaged insulation, or loose connectors. Check winding resistance at the motor to confirm there is no internal short. If the wiring checks out, the fan motor itself may need replacement. If the fault persists after replacing the motor, the control board should be evaluated.
Is it safe to keep using my Sub-Zero refrigerator while error 35 C 33 is active?
The refrigerator may continue to operate, but condenser fan faults can reduce the unit's ability to reject heat effectively. Prolonged operation with this fault could stress the compressor and other components over time. It is best to have the issue diagnosed and repaired promptly rather than ignoring it.
How much does it cost to repair error code 35 C 33 on a Sub-Zero refrigerator?
Repair costs depend on the root cause. A condenser fan motor replacement typically runs in the range of $150 to $400 including parts and labor. If the control board is at fault, costs can range from $400 to $900 or more depending on the specific model. Diagnostic fees may apply separately.
Will resetting my Sub-Zero refrigerator clear error code 35 C 33?
A reset may temporarily clear the fault code from the display, but if the underlying problem in the condenser fan circuit is not corrected, the code will return. Resetting without diagnosis and repair does not fix the fan motor, wiring, or control issue causing the overspeed condition.

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