Sub-Zero Refrigerator Error Code 87

Error code 87 indicates that speed information from the electronic control board is outside the acceptable specification for the VS compressor system. This code applies specifically to the 700TF/I-2V model. It points to a communication issue between the main control board and the VS compressor controller, which may or may not be accompanied by actual cooling problems.

Error code 87 does not indicate a safety hazard such as a fire or electrical danger. The primary concern is whether your refrigerator is maintaining safe food storage temperatures. If cooling is unaffected, the risk is low. If temperatures are rising inside the unit, food safety becomes a concern and service should be scheduled promptly.

Only if the serial communication wiring between the two components has been inspected and confirmed to be in good condition. If the wiring checks out and the fault persists, the diagnostic procedure calls for replacing both the electronic control board and the VS compressor controller together. Replacing just one without the other is not recommended in this situation, as the components are designed to work as a matched pair in the communication circuit.

If your Sub-Zero is cooling normally and you have no other symptoms, clearing the error code is the recommended first step and may resolve the issue entirely. However, if the underlying communication problem between the control board and VS compressor controller is still present, the code will likely return. Clearing the code without addressing a wiring or component fault only provides a temporary result.

Repair costs vary depending on the root cause. If the issue is a loose connector or damaged wire, the cost is generally limited to a service call fee, typically in the range of $100 to $200. If both the electronic control board and VS compressor controller need replacement, parts and labor combined can range from $600 to $1,500 or more, depending on parts availability and local labor rates.