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Lennox Mini Split E1 Error Code

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

Quick answer

[M22A/M33C] Communication error between indoor unit and outdoor units.

Severity: high · DIY difficulty: intermediate

Safety

TBD - must be written per-code before publish

What E1 means

[M22A/M33C] Communication error between indoor unit and outdoor units.

Causes, ranked

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

Commonly searched as: "lennox e1" · "lennox error code e1" · "lennox air conditioner e1"

Sources

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