Sub-Zero Freezer Error Code 59: Compressor Overcurrent Troubleshooting
Is your Sub-Zero freezer showing error 59? This guide helps you troubleshoot the compressor overcurrent and get your freezer running again!
Is your Sub-Zero freezer showing error 59? This guide helps you troubleshoot the compressor overcurrent and get your freezer running again!
The expected resistance values vary depending on the compressor model. Consult the Sub-Zero service manual for your specific model. Typically, the resistance between each winding should be very low (around 1-5 ohms), and the resistance between each winding and ground should be very high (megaohms).
The service mode access procedure varies depending on the model. Typically, it involves pressing and holding a specific sequence of buttons on the control panel. Refer to the service manual for the correct procedure for your model.
You can purchase replacement MCUs from authorized Sub-Zero parts distributors or appliance parts retailers. You will need the model and serial number of your Sub-Zero to ensure you order the correct part.
error code 59 indicates that the Main Control Unit (MCU) has detected an overcurrent condition in the freezer compressor circuit. The MCU monitors the current draw of the compressor. If the current exceeds a pre-determined threshold for a specific duration, the MCU will shut down the compressor and display the error code. This protection is in place to prevent damage to the compressor and other components. Voltage to the compressor is typically routed through a relay controlled by the MCU.
The homeowner reports that the freezer is not cooling and error code 59 is displayed on the control panel. The compressor may be making a clicking sound, or not running at all.
Disconnect power to the appliance at the breaker panel before performing any repairs. Lock-Out/Tag-Out (LOTO) procedures should be followed to prevent accidental re-energization of the circuit. High voltage is present in the appliance, and improper handling can result in severe electrical shock or death.
Regularly clean the condenser coils (located at the rear or bottom of the unit) to ensure proper airflow and prevent the compressor from overheating. Ensure the unit is connected to a dedicated 15-amp circuit.
After replacing the compressor or MCU, it may be necessary to manually clear the error code from the system's memory. Consult the service manual for the specific procedure, which often involves pressing a combination of buttons on the control panel or entering a service mode.