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Lennox Mini Split EC56 Error Code

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

Quick answer

[M22A/M33C] Indoor unit #1 coil outlet temperature sensor error (T2B for multi-zone) Indoor unit #2 coil outlet temperature sensor error (T2B for multi-zone) Indoor unit #3 coil outlet temperature sensor error (T2B for multi-zone) Indoor unit #4 coil outlet temperature sensor error (T2B for multi-zone) Indoor unit #5 coil outlet temperature sensor error (T2B for multi-zone) Indoor unit #6 coil outlet temperature sensor error (T2B for multi-zone).

Severity: high · DIY difficulty: intermediate

Safety

TBD - must be written per-code before publish

What EC56 means

[M22A/M33C] Indoor unit #1 coil outlet temperature sensor error (T2B for multi-zone) Indoor unit #2 coil outlet temperature sensor error (T2B for multi-zone) Indoor unit #3 coil outlet temperature sensor error (T2B for multi-zone) Indoor unit #4 coil outlet temperature sensor error (T2B for multi-zone) Indoor unit #5 coil outlet temperature sensor error (T2B for multi-zone) Indoor unit #6 coil outlet temperature sensor error (T2B for multi-zone).

Causes, ranked

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

Commonly searched as: "lennox ec56" · "lennox error code ec56" · "lennox air conditioner ec56"

Sources

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