Sub Zero 600 Series Refrigerator EC 20 Error Code

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What it means

The freezer defrost terminator has reported a defrost underheat condition with no expected voltage feedback.

Try this first

Customer troubleshooting is not available for this fault.
Contact Factory Certified Service.

Can I keep using it?🔴 Defrost-system fault

Repair usually required?🔴 Service required

If the error keeps returning

If the condition returns after troubleshooting, qualified service may be required.

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.

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Sub-Zero 600 Series Refrigerator EC 20: Quick Answer

What it means: The freezer defrost terminator has reported a defrost underheat condition with no expected voltage feedback.

First thing to check

Customer troubleshooting is not available for this fault.

Can I keep using it?

Defrost-system fault

Repair outlook

Service required

If the code remains

If the condition returns after troubleshooting, qualified service may be required.

Model note: Error-code meanings and procedures can vary by model and model year. Confirm the code against the documentation for your exact appliance before replacing parts.

Manufacturer reference: subzero-wolf.com