Sub-Zero Refrigerator Error Codes — Complete List

Sub-Zero shows a short family of readouts: EC50 and EC40 when a compressor has run for too long, EC24 for a defrost under-heat, and the plain 'Service' and 'Vacuum Condenser' prompts. A dusty condenser is the first thing to check for most of them.

• EC50 (EC 50) 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 (EC 40, Error Code 40) 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 (EC 24, 600 24, 24) 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, Service light) '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, Clean 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.

Don't see your code?

Sub-Zero's guidance is to check the temperature first: if it's high, call Factory Certified Service.