Sub-Zero Error Codes

Pick the code your Sub-Zero appliance is showing. Each page explains what the code means, the most likely causes ranked by probability, and which fixes are safe to try before calling a technician.

Sub-Zero Refrigerator Codes

• EC50 EC50 is Sub-Zero's excessive-compressor-run code: the compressor runs far longer than expected, and the panel flashes EC50 (or toggles EC with the temperatures) alongside the Service light.
• EC40 EC40 on 600, 648PRO, and 700 Series Sub-Zeros is the excessive-freezer-compressor-run code: the freezer compressor has been running far longer than normal, and the panel toggles between the temperatures, EC, and the Service light.
• EC24 EC24 is Sub-Zero's defrost under-heat code — during the defrost cycle the evaporator didn't reach the temperature needed to clear its frost, and the panel shows 24 (or EC24) along with the Service light.
• Service 'Service' flashing between the zone temperatures is Sub-Zero's general attention prompt — the control has logged a condition (usually excessive compressor run) and wants the unit looked at, not a diagnosis in itself.
• Vacuum Condenser 'Vacuum Condenser' flashing on a Sub-Zero 600 Series unit (built before serial 1810000) is an efficiency notice: the control thinks the unit isn't running as efficiently as it should, typically because the condenser is dust-covered.