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Lennox Mini Split F6 Error Code

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

Quick answer

[M22A/M33C] Indoor coil outlet temperature sensor error (T2B).

Severity: high · DIY difficulty: intermediate

Safety

TBD - must be written per-code before publish

What F6 means

[M22A/M33C] Indoor coil outlet temperature sensor error (T2B).

Causes, ranked

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

Commonly searched as: "lennox f6" · "lennox error code f6" · "lennox air conditioner f6"

Sources

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