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Samsung Mini Split C440 Error Code

Updated 2026-08-29 · review status: draft Draft - unverified

Quick answer

C440 is Prohibit operation condition error (COOLING) - outdoor conditions outside allowed COOLING range. The unit is stopping or limiting operation because that reading or component cannot be trusted.

Severity: high · DIY difficulty: intermediate

Safety

TBD - must be written per-code before publish

What C440 means

C440 is Prohibit operation condition error (COOLING) - outdoor conditions outside allowed COOLING range. The unit is stopping or limiting operation because that reading or component cannot be trusted.

Causes, ranked

  1. Causes not yet documented — verify against the service manual.

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Sources

  • SplitAtlas manual-sourced reference — verified 2026-08-29