Sub-Zero error code 21 — Defrost overheat

What is the brand for Sub-Zero error code 21 — Defrost overheat?

For Sub-Zero error code 21, meaning is Defrost overheat, verified against its source on 2026-09-16.

Cause: Defrost overheat

— subzero-wolf.com, retrieved 2026-09-16

Verified2026-09-16

Review by2027-09-16

The values above are stated away from the sentence quoted with the answer, so the passage that states them is shown here too.

Brand and Error code

Sub-Zero 600 Series Error Code 21

— all from subzero-wolf.com, retrieved 2026-09-16

subzero-wolf.comhttps://www.subzero-wolf.com/assistance/answers/sub-zero/600-series/600-series-error-code-21

Last verified against source: 2026-09-16. Due for re-check by 2027-09-16. This page as Markdown · OKF bundle · full dataset as JSON.