SubZero Refrigerator Freezer Error Code 06 – How to fix? by KatyApplianceRepair.com 

Sub-Zero error code EC 06 indicates
a refrigerator evaporator thermistor fault. Below is a quick reference
and troubleshooting guide for this code.

Quick Reference

Error Code	Meaning	Severity
EC 06	Thermistor fault — inconsistent temperature readings from the evaporator sensor	Medium

Cause & Solution

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