SubZero Refrigerator Freezer Error Code 08 – How to fix? by KatyApplianceRepair.com  

Sub-Zero error code EC 08 indicates
a freezer evaporator thermistor fault. Below is a quick reference
and troubleshooting guide for this code.

Quick Reference

Error Code	Meaning	Severity
EC 08	Thermistor fault — inconsistent temperature readings from the freezer evaporator sensor	Medium

Cause & Solution

Cause	What to Check	Fix
Loose or faulty freezer evaporator thermistor wiring	Inspect connections from the freezer evaporator thermistor to the control board	Reconnect or repair wiring
Defective freezer evaporator thermistor	Measure resistance at operating temperature	Replace the thermistor if out of specification