SubZero Refrigerator Freezer Error Code SU – How to fix? by KatyApplianceRepair.com
Sub-Zero error code EC SU indicates
a wiring or defrost issue. Below is a quick reference
and troubleshooting guide for this code.
Quick Reference
| Error Code | Meaning | Severity |
|---|---|---|
| EC SU | Display cable fault (blue wire) — wiring or defrost-related issue | Medium |
Cause & Solution
| Cause | What to Check | Fix |
|---|---|---|
| Blue wire of display cable unhooked or faulty | Inspect the display cable connections at both ends | Repair wiring or replace the display cable |
Need help with EC SU?
Call (281) 688-6685 —
Katy Appliance Repair: same-day Sub-Zero diagnostics in Katy, TX.