Sub-Zero Refrigerator Error Code EE

EE on a Sub-Zero refrigerator means the control board has detected a thermistor error. Either a thermistor in one of the monitored locations is reading outside the expected resistance range, or its electrical connection is broken. The code does not indicate which thermistor is at fault on its own, so you need to enter the Sub-Zero diagnostic mode to identify the specific sensor before troubleshooting further.

The refrigerator may continue to run with EE active, but you should not rely on it to maintain safe food temperatures in the affected zone. Without a functioning thermistor, the control board cannot accurately regulate cooling in that area, which can result in temperatures that are too warm or too cold. Check the actual compartment temperature with a separate thermometer. If temperatures are drifting from safe ranges, move perishables and schedule the repair promptly.

Disconnect the thermistor connector from the wiring harness so you are reading only the sensor itself. Set a multimeter to measure resistance in ohms. Place the probes on the two thermistor terminals and compare the reading to the known values: approximately 32,500 ohms at 32°F and 10,000 ohms at 77°F. A reading of zero, infinite resistance, or a value wildly outside this range at the current temperature confirms the thermistor has failed and needs to be replaced.

Start by entering Sub-Zero's diagnostic mode to identify which thermistor is flagged. Once located, check the thermistor's wiring connector to make sure it is fully seated. If the connection is secure, use a multimeter to measure the thermistor's resistance and compare it to the spec values: 32,500 ohms at 32°F or 10,000 ohms at 77°F. A reading far outside these values confirms a failed thermistor that needs replacement. If resistance is correct and connections are solid, trace the wiring harness back toward the control board for damage.

If the fix is a reseated wiring connector, there is no parts cost and the repair can be done without professional help. A replacement thermistor for a Sub-Zero unit typically costs between $20 and $80 for the part depending on the model and location. If professional service is needed, expect labor charges on top of that, which can bring the total to $150 to $350 or more depending on your area and how accessible the thermistor is. Control board replacement, if it comes to that, is significantly more expensive.