---
type: lookup
id: 20
asset: appliance-fault-error-codes
title: "20 — Appliance fault and error codes"
sources:
  - https://faultcodelab.com/data/error-codes.v1.json
source_quote: "freezer-defrost underheat condition with missing feedback at defrost start."
generated: true
verified: false
harvested: 2026-08-04
stale_after: 2027-08-04
brand: "Sub-Zero"
appliance_type: "refrigerator"
error_code: "20"
meaning: "Freezer-defrost underheat condition with missing feedback at defrost start."
---
**Brand:** Sub-Zero

**Appliance type:** refrigerator

**Error code:** 20

**Meaning:** Freezer-defrost underheat condition with missing feedback at defrost start.

> freezer-defrost underheat condition with missing feedback at defrost start.

Source: <https://faultcodelab.com/data/error-codes.v1.json>