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Error code reference

Sub-Zero Refrigerator Error Code 35 r 33

Refrigerator evaporator fan running faster than its setting, possibly shorted.

Sub-Zero codesSub-Zero refrigerator codes

Refrigerator evaporator fan running faster than its setting, possibly shorted.

First step from the service manual

Verify refrigerator evaporator fan not shorted.

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

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  • 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
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What 35 r 33 means on a Sub-Zero refrigerator

Error code 35 r 33 on a Sub-Zero refrigerator indicates that the refrigerator compartment evaporator fan is operating at a speed higher than its commanded setting. The control board monitors fan motor RPM continuously and compares actual speed against the target speed it has commanded. When the fan runs faster than it should, the board logs this fault as a runaway or over-speed condition. This type of behavior points directly to an electrical fault in the fan motor circuit, most commonly a short circuit within the motor windings or in the wiring harness supplying power to the fan.

A shorted fan motor can cause the speed control signal to be bypassed or corrupted, allowing the motor to spin beyond its regulated range. In brushless DC evaporator fan motors, the control board sends a pulse-width modulated signal to govern speed. If the motor's internal circuitry is shorted, it may ignore the PWM signal and run at an uncontrolled rate. Similarly, a short in the wiring between the control board and the fan motor can inject erroneous voltage into the control line, producing the same over-speed result.

The primary diagnostic step is to inspect the refrigerator evaporator fan for a short circuit. This involves checking the motor windings for resistance values outside the normal range and inspecting the harness connectors for damaged insulation, pinched wires, or corrosion that could create an unintended electrical path. If the motor or its wiring harness is confirmed shorted, replacement is necessary. The control board should also be evaluated if the fan and wiring check out within spec, as a board fault can send a corrupted speed command.

Source: manufacturer service documentation.

Common causes of 35 r 33

  1. 01

    Shorted evaporator fan motor

    Part replacement

    A short circuit within the fan motor windings causes the motor to run beyond its commanded speed. The motor should be tested for abnormal resistance readings and replaced if it fails the test.

  2. 02

    Damaged or shorted wiring harness

    Part replacement

    Pinched, chafed, or moisture-damaged wiring between the control board and the evaporator fan can create a short that disrupts speed control signals. Inspect the full harness run for visible insulation damage or corroded connectors.

  3. 03

    Faulty fan motor connector

    Wiring / connection

    A loose or corroded connector at the fan motor can cause intermittent shorts that produce erratic speed readings. Disconnecting and inspecting the connector for oxidation or bent pins is part of the initial check.

  4. 04

    Defective control board

    Part replacement

    If the control board is sending an incorrect PWM signal or has a failed output driver, the fan may receive a command that results in over-speed operation. The board should be evaluated after ruling out the fan and wiring.

See the test procedure for each cause

Frequently asked questions about 35 r 33

What does 35 r 33 mean on a Sub-Zero refrigerator?
Error code 35 r 33 means the refrigerator compartment evaporator fan is running faster than the speed the control board commanded. The board continuously monitors fan RPM and flags this code when actual speed exceeds the target. This condition is most often caused by a short circuit in the fan motor or its wiring. A technician needs to inspect and test the fan motor and harness to diagnose the root cause.
Can I fix error code 35 r 33 myself?
A knowledgeable DIYer can begin by visually inspecting the wiring harness and connectors leading to the refrigerator evaporator fan for obvious damage, pinching, or corrosion. However, properly testing the fan motor windings for a short requires a multimeter and some electrical knowledge. If the motor or wiring is confirmed faulty, replacing a fan motor is a manageable repair, but diagnosing a control board fault is best left to a qualified technician.
Is it safe to keep using my Sub-Zero refrigerator when error 35 r 33 is active?
A shorted fan motor or wiring can potentially cause additional electrical damage if left running. Beyond the risk of further component damage, an improperly controlled evaporator fan may affect cooling performance and food safety. It is advisable to have the refrigerator inspected promptly rather than continuing to operate it with this fault active.
How much does it cost to repair error code 35 r 33 on a Sub-Zero refrigerator?
Repair costs depend on which component is faulty. A replacement evaporator fan motor for a Sub-Zero refrigerator typically costs between $80 and $200 for the part alone, with labor adding another $100 to $250 depending on your location and the technician's rates. If the control board is the source of the problem, board replacement costs can range from $300 to $600 or more for parts and labor combined.
Will resetting my Sub-Zero refrigerator clear error code 35 r 33?
Resetting the unit by cycling power may temporarily clear the code from the display, but the fault will return if the underlying short circuit in the fan motor or wiring has not been repaired. A reset is useful for confirming whether the fault is intermittent, but it does not fix the electrical problem causing the over-speed condition. Persistent recurrence of the code after a reset confirms that a physical repair is needed.

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