Sub Zero 600 Series Refrigerator Error Codes

Sub-Zero identifies 600 Series error 05 as the refrigerator cabinet thermistor reading open or shorted for 10 or more seconds, or repeatedly reporting erratic temperatures.

Sub-Zero identifies 600 Series error 07 as the freezer cabinet thermistor reading open or shorted for 10 or more seconds, or repeatedly reporting erratic temperatures.

Sub-Zero identifies 600 Series error 08 as the freezer evaporator thermistor reading open or shorted for 10 or more seconds, or repeatedly reporting erratic temperatures.

Sub-Zero identifies 600 Series error 20 as defrost underheat with no voltage feedback through the gray/white wire at defrost start, and its troubleshooting guidance identifies an issue with the freezer defrost terminator.

Sub-Zero identifies 600 Series error 21 as a defrost overheat condition.

Sub-Zero identifies 600 Series error 24 as a defrost underheat condition.

Sub-Zero identifies 600 Series error 30 as excessive ice-maker water-valve solenoid activation, exceeding 15 seconds five times.

Sub-Zero identifies 600 Series error 40 as excessive freezer compressor run time.

Sub-Zero identifies 600 Series error 50 as excessive refrigerator compressor run time.

Sub-Zero identifies EE with Service flashing as a thermistor fault: EE on the left indicates the freezer compartment thermistor, while EE on the right indicates the refrigerator compartment thermistor.