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EE

EE — High water level alarm

Lennox · Air Conditioning

What does EE mean?

For ducted units only: The condensate drain system is overwhelmed or blocked, causing the water level to become too high. This is a safety measure to prevent water damage.

Common Causes

  • Clogged condensate drain line
  • Failed condensate pump (if applicable)
  • Improper drain line installation
  • Excessive condensation

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Check the condensate drain line for any blockages (e.g., debris, algae).

  2. 2

    If the unit has a condensate pump, ensure it is functioning correctly.

  3. 3

    Clean the drain pan and line.

  4. 4

    Ensure the drain line is properly sloped away from the unit.

Browse all codes in this manual (57)
Verified technical data. Last updated: April 2026

Related Faults

E0E0 — Indoor unit EEPROM error (MMDB Indoor Units)E1E1 — Communication error between indoor and outdoor units (MMDB Indoor Units)E3E3 — Indoor fan speed error (MMDB Indoor Units)
Source: Lennox Air Conditioning
Open Manual (Page 6)Search more codes in this manual