Skip to main content
Error code reference
Sub-Zero Freezer Error Codes
56 error codes documented with diagnostic procedures.
Have your model number? Get codes specific to your unit.
--Unit is in shutdown mode; all unit functions suspended except lights and door alarm.01Zone X Cabinet Thermistor Failure (Device or Wiring).02Zone X Evaporator Thermistor Failure (Device or Wiring).03Zone X Condenser Thermistor Failure (Device or Wiring).04Ambient Thermistor Failure (Device or Wiring).05Refrigerator cabinet thermistor read open or shorted for 10+ seconds, or repeatedly read…06Refrigerator evaporator thermistor read open or shorted for 10+ seconds, or repeatedly…07Freezer cabinet thermistor read open or shorted for 10+ seconds, or repeatedly read…08Freezer evaporator thermistor read open or shorted for 10+ seconds, or repeatedly read…10Upper cabinet warm temperature alarm.11Upper cabinet cold temperature alarm.12Lower cabinet warm temperature alarm.13Lower cabinet cold temperature alarm.15Sealed system fault20Defrost under-heat with no voltage feedback through gray/white wire at defrost start.21Check Zone X Defrost Bi-metal for Proper Operation.22No voltage feedback through gray/white wire at defrost start.23Defrost overheat with no voltage feedback through gray/white wire at defrost start.24Zone X Defrost Heater resistance out of specification30Excessive icemaker water valve solenoid activation (exceeded 15 seconds, 5 consecutive…35Check Zone X Fan, Fan Speed Error.40Excessive freezer compressor run (compressor ran 100% for 6 hours continuously).41Check Zone X Compressor and Wiring.42Check Condenser Fan and/or Wiring.43Check Left Refrigerant Valve and Wiring.44Check Zone X Glass Door Heater and Wiring.45Errors Detectable with Red Door Switches46Check Ice Accessory Wiring for Open Circuit.47Check Accent Lighting Wiring for Short Circuit.50Excessive refrigerator compressor run (700BCI) or excessive refrigerator fan run (700BR).55Zone thermistor is shorted in the indicated zone.80High variable speed compressor differential pressure or low voltage supplied to VS…81High amperage draw at variable speed compressor (700TF/I-2V only).82VS compressor could not maintain lowest minimum speed at highest current draw (700TF/I-2V…83Replace Zone X Variable Speed Compressor and Filter-Drier.84Short circuit at VS compressor controller output circuit (700TF/I-2V only).85VS compressor converter overheated and shut down VS compressor (700TF/I-2V only).86Serial communication failure between VS compressor controller and electronic control…87Speed information from electronic control board is out of specification (700TF/I-2V only).88Electronic control board not receiving status data in response to speed commands…89Check Icemaker Solenoid Valve and Wiring.90Change Main Control Board.91Primary on accent LED power supply failure; both bulbs must be burned out on drawers to…92Check Keypad Wiring.93Replace Keypad.94Check Wiring / Replace User Display #1 (Zone 1) or User Display #2 (Zone 3), depending on…96Datalogger Malfunction.97Check Communications Cables / Connectors.98Brownout detectedE0Communication error between control board and control panel (base units only).E3Communication error between control board and control panel (base units only).ECExcessive compressor run with error codes registered in the electronic control memory.EECompartment thermistor (or its wiring) is open, shorted, or has a breakSERVICEFlashing SERVICE annunciator alone indicates excessive compressor run (tall units) or…SuBlue wire of display cable is unhooked or faulty.VACUUM CONDENSERExcessive compressor run time detected
Get the full diagnostic procedure for any code
Step-by-step tests, expected values, wiring diagram references, and verified part numbers.
Get Started $9.95 3-day pass$29/month for unlimited access to all brands and Max AI diagnostics.
More Sub-Zero error codes
Common questions
How do I find the error code on my Sub-Zero Freezer?
Most Sub-Zero freezers show the code directly on the control panel display. If your model has no display, it can be read by entering diagnostic mode with the key sequence for your model. The full procedures include model-specific instructions for reading codes.
Are these codes specific to my model?
The codes here apply broadly to Sub-Zero freezers. Meanings and diagnostic steps can vary by model and production year, so enter your model number for model-specific information and procedures.
What do I do if my code is not listed?
Some codes are model-specific or only appear in diagnostic mode. Enter your model number to get codes specific to your unit, or contact us. We update the database continuously from manufacturer service documentation.
How much does it cost to access the full diagnostic procedures?
A 3-day pass is $9.95 one-time and gives full access to all brands, codes, and procedures. Monthly access is $29/month with unlimited access to everything including Max AI diagnostics.