Sub-Zero Refrigerator Error Code 35 A 37

Error code 35 A 37 indicates that the control board has detected a short circuit or a connection problem in the air filter fan circuit. This fan circulates air through the refrigerator's filtration system. The code alerts you that the fan may not be operating correctly due to a wiring fault, a disconnected connector, or a failed motor.

A short circuit in the fan circuit can place additional stress on the control board and may lead to further electrical damage if left unaddressed. While the refrigerator may continue to cool in the short term, it is advisable to diagnose and repair the fault as soon as possible to avoid secondary component failures.

Repair costs vary depending on the cause. If the fix is simply reseating a loose connector, the cost may be limited to a service call fee, typically in the range of $100 to $200. If the fan motor needs replacement, parts and labor combined can range from $200 to $500 or more. Control board replacement, if required, is generally the most expensive repair and can exceed $500 depending on the model.

Start by checking that the air filter fan's wiring connector is fully seated and that no wires are visibly damaged or pinched. If the connection looks secure and no shorts are visible, use a multimeter to test the fan motor windings for a short to ground. If the motor has failed, it will need to be replaced. If the wiring and motor test normally, the control board should be evaluated.

A reset may temporarily clear the code from the display, but if the underlying short or connection problem has not been corrected, the code will return. The root cause in the fan wiring or motor must be resolved before the fault will stay cleared permanently.