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Error code reference

Sub-Zero Refrigerator Error Code 35 r 34

Refrigerator evaporator fan shorted; runs faster than speed setting.

Sub-Zero codesSub-Zero refrigerator codes

Refrigerator evaporator fan shorted; runs faster than speed setting.

First step from the service manual

Verify refrigerator evaporator fan not shorted. If the fan is shorted, it runs faster than the speed setting.

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
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What 35 r 34 means on a Sub-Zero refrigerator

Error code 35 r 34 on a Sub-Zero refrigerator indicates a fault condition in the refrigerator compartment evaporator fan circuit. Specifically, the control board has detected that the evaporator fan is operating faster than its commanded speed setting, which is a characteristic symptom of a shorted fan motor winding. The evaporator fan is responsible for circulating cold air across the evaporator coil and distributing it throughout the refrigerator compartment. When the motor windings develop an internal short, normal electrical resistance within the motor drops, allowing excess current to flow and causing the motor to spin beyond its intended RPM range.

The control board continuously monitors fan speed through feedback signals. When the actual fan speed exceeds the programmed target, the board logs this fault and triggers the error code. A shorted motor winding can result from insulation breakdown within the motor coil, moisture intrusion into the motor housing, or mechanical wear that causes winding-to-winding or winding-to-ground contact. In some cases, wiring harness damage between the control board and the fan motor can produce similar symptoms by altering the feedback signal.

Diagnosing this fault requires verifying the fan motor itself is shorted rather than assuming the control board is misreading a normal condition. Inspecting the motor for physical damage, checking the wiring harness for pinched or chafed insulation, and measuring motor winding resistance are the appropriate first steps. If the motor is confirmed shorted, replacement is required since shorted windings cannot be repaired in the field.

Source: manufacturer service documentation.

Common causes of 35 r 34

  1. 01

    Shorted evaporator fan motor windings

    Part replacement

    Internal insulation breakdown within the fan motor causes winding-to-winding or winding-to-ground contact, dropping resistance and allowing the motor to overspeed. This is the primary cause indicated by this error code and requires motor replacement.

  2. 02

    Moisture intrusion in the fan motor

    Part replacement

    Ice buildup or water from defrost cycles can infiltrate the fan motor housing, corroding windings and creating electrical shorts. Inspect the evaporator compartment for excessive frost accumulation or evidence of water contact on the motor body.

  3. 03

    Damaged wiring harness to the fan

    Wiring / connection

    Pinched, chafed, or abraded wiring between the control board and the evaporator fan motor can create unintended electrical paths that mimic a motor short. Inspect the harness routing for any contact with sharp edges or moving components.

  4. 04

    Faulty fan motor connector or terminal

    Wiring / connection

    Corroded or loosely seated connector pins at the fan motor or control board can cause resistance changes in the circuit that produce abnormal speed readings. Clean and reseat connectors before condemning the motor itself.

  5. 05

    Failed control board fan speed circuit

    Part replacement

    In less common cases, the fan speed monitoring circuit on the control board may malfunction and incorrectly report that the fan is overspeeding even when the motor tests within normal parameters. This is typically considered after the motor and wiring have been ruled out.

See the test procedure for each cause

Frequently asked questions about 35 r 34

What does 35 r 34 mean on a Sub-Zero refrigerator?
Error code 35 r 34 means the refrigerator compartment evaporator fan has been detected running faster than its commanded speed setting, which indicates a shorted fan motor. The control board monitors fan speed continuously, and when actual speed exceeds the target, this fault is logged. The evaporator fan is the component responsible for circulating cold air through the refrigerator section. A shorted motor winding is the most common root cause of this specific code.
Can I fix error code 35 r 34 myself?
A knowledgeable DIYer can inspect the wiring harness and connectors to the evaporator fan for visible damage and reseat any loose connections. However, confirming a shorted motor requires measuring winding resistance with a multimeter. If the motor is shorted, replacing the evaporator fan motor is the required repair, and accessing the evaporator compartment on Sub-Zero units typically involves removing shelving, panels, and sometimes the evaporator cover, which can be complex.
Is it safe to keep using my refrigerator when error code 35 r 34 is showing?
A shorted evaporator fan motor can reduce airflow through the refrigerator compartment, which may compromise food safety over time due to inconsistent temperatures. There is also a risk of the motor overheating if it is drawing excess current. It is advisable to check that the refrigerator is maintaining proper temperature and to schedule a repair promptly rather than continuing to operate the unit with this fault active.
Will resetting my Sub-Zero clear error code 35 r 34?
A control board reset may temporarily clear the displayed fault code, but it will not resolve the underlying electrical short in the fan motor. If the motor remains shorted, the code will return once the control board detects the overspeed condition again. The fault must be corrected at the component level before a reset will result in a permanently clear code.
How much does it cost to repair error code 35 r 34 on a Sub-Zero refrigerator?
Repair costs vary depending on the specific Sub-Zero model and whether the repair requires only a fan motor replacement or also involves wiring or control board components. Parts costs for an evaporator fan motor on Sub-Zero units typically range from around $80 to $250 or more depending on the model. Adding professional labor, total repair costs commonly fall in the range of $200 to $500, though more complex disassembly on certain models can push costs higher.

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