Sub-Zero E3 Error Code Explained

Error codes can be vague; they give you an idea of what's wrong and where to look, but not an exact science.

The error codes can indicate multiple problems at once. You will need to eliminate each defective part one at a time.

 

E3 CODE

A Sub-Zero refrigerator E3 error code typically indicates a problem with the evaporator thermistor or a related cooling issue. This could mean a faulty thermistor, a bad connection, or irregular temperature readings. It is recommended to check the evaporator thermistor, reset the error code by holding the "alarm" bell button for 15 seconds, and if the error persists, consider replacing the thermistor or calling a service technician. 

The E3 code often indicates a problem with the sensor that measures the evaporator temperature. 

       Troubleshooting:

Check the thermistor: Disconnect the thermistor and measure its resistance with a multimeter. The value should match the one in the manual and not be infinite, according to a YouTube video on AC error codes. 

Reset the code: Try resetting the error code by holding the "alarm" bell button for 15 seconds. 

Replace the thermistor: If the error persists after resetting and the thermistor is faulty, it will need to be replaced. To test a Sub-Zero evaporator thermistor, you'll need to check its resistance using a multimeter, ideally in an ice water bath to ensure a consistent temperature of 32°F (0°C). The thermistor should read between 30,000 and 33,000 ohms at this temperature. If the resistance is outside this range, the thermistor is likely faulty and should be replaced.