The most common reason is a clogged or frozen defrost drain. Water from defrost cycles can’t drain and overflows instead. We fix this fast by clearing and testing the drain line.

EC 24 indicates a defrost heater failure or missed defrost cycle. You can clear it by holding the “power” and “colder” buttons together — but it won’t fix the root cause. We diagnose the heater and sensors to stop it from returning.

Sub-Zero recommends keeping your freezer at 0°F (-18°C). Anything warmer may reduce food safety. We recalibrate digital panels and sensors if your freezer drifts out of range.

Most Sub-Zero freezers last 20+ years — but only with proper maintenance. Annual coil cleaning and periodic seal inspection can add years of cold, quiet life to your unit.

We strongly recommend OEM (original) parts only. Aftermarket or refurbished parts may fail early, cause warranty issues, or even damage your sealed system. We install only factory-authorized parts.

Some gentle hum or fan noise is normal — but loud buzzing, clicking, or knocking may indicate compressor or evaporator issues. Call us if it sounds more like a drum solo than a freezer.

Nope — keep it plugged in. We need to see it in its current condition: temperature, sounds, lights, codes. Unplugging can erase helpful diagnostic data.

Absolutely. We regularly service the freezer section of PRO 48 models — whether it’s not freezing, leaking, or throwing an EC code. We carry parts on hand for faster fixes.

EC 20 is a communication error between the control board and sensors. It can also point to a power failure. We use factory diagnostics to verify and replace the right components.

Same-day service is often available if you call before 3pm. We serve all San Jose zip codes and nearby areas. Fast fix. No runaround.