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Sub-Zero Refrigerator or Freezer Fan Switch Information


  • Refrigerator or freezer fan does not work
  • How to replace fan switch
  • What does the fan switch do?
  • Does my unit have two fan switches?
  • What does the switch next to the fan switch do?


  1. Verify the unit is cooling properly.
  2. If the fan does not come on when the fan switch is pressed for several minutes, it may be faulty.
    • The light and fan switches are mounted to the top mainframe. The light switch is on the left, and the fan switch is on the right.
    • The fan and light switches have separate part numbers.
    • The fan switch controls the evaporator fan.
    • The fan switch function is the opposite of the light switch. It turns on when the door is closed, instead of off.
    • If a light switch is installed in the fan switch location, poor temperatures will result.
    • If the fan switch is not working, symptoms may include temperature issues (bottom is cold, top is warm).
    • If the lights are out inside a refrigeration unit, see Refrigerator or Freezer Light Switch Information.
    • It is not necessary to replace the fan switch if the light switch needs replacing.
  3. Fan and light switches are replaced the same way. However, diagnosing a fan switch as the only issue with a product is difficult, and Factory Certified Service is suggested to make sure the unit continues to cool properly.
  4. See also:

Contact a Factory Certified Parts Distributor to order parts.


Refer to the documents below for instructions to replace fan switches.

Product Part Number Instructions
200/300 Series* 7014651 Switch Instructions
500 Series** 7014651 Switch Instructions
600 Series 7014651 Switch Instructions
501 and 601 Fan Switch 7004259 Switch Instructions
700 Series Upper Section 7004259 Switch Instructions
Model 424 7004259 Switch Instructions
Model 427 7004259 Switch Instructions
BI Series Light Switch 7007259 Switch Instructions

*Prior to serial number M393733/P397233, use 4200340.

**Model 550 - Prior to serial number M702716/P700765, except between M681166 - M681565, use 7004259.

See also:

If these steps do not resolve the issue, no further troubleshooting advice is available. Contact Factory Certified Service to schedule an appointment for repair.


Need further assistance? Contact Customer Care at 800.222.7820 or provide your information below and request a Customer Care representative contact you.

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