ERROR CODE EXPLAINED
Sub Zero 600 Series Refrigerator
Sub Zero 600 Series Refrigerator EC 40 Error Code
What it means
Sub-Zero identifies 600 Series error 40 as excessive freezer compressor run time.
Try this first
- If temperatures are high and the condition is not likely caused by a door being ajar, contact Factory Certified Service.
- If temperatures are near normal, clean the condenser.
- Press and hold the door ajar alarm key for 15 seconds to clear the error code.
- If the unit does not have a door ajar alarm key, turn the home circuit breaker off for 30 seconds and then back on.
- Retest refrigerator operation.
- If the issue remains, contact Factory Certified Service to schedule a repair appointment.
Can I keep using it?⚠ Sub-Zero identifies 600 Series error 40 as excessive freezer compressor run time.
Repair usually required?⚠ Follow only the manufacturer-backed checks listed below before further repair diagnosis.
If the error keeps returning
Use the linked official Sub-Zero, Wolf, and Cove support article and contact Factory Certified Service if the issue remains.
Official source
Troubleshooting information verified against manufacturer support documentation.
View manufacturer support page →Safety note:ApplianceSignal provides general troubleshooting information. Always follow the appliance manufacturer's safety instructions and disconnect power when required.