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EC07

EC07 — Outdoor DC fan motor malfunction/fan speed out of control

Lennox · Air Conditioning

What does EC07 mean?

The outdoor unit's DC fan motor is not operating correctly, or its speed is not being properly controlled. This can affect heat exchange.

Common Causes

  • Faulty DC fan motor
  • Problem with the fan motor control circuit
  • Obstruction impeding fan rotation

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Ensure the outdoor fan blades are unobstructed and can spin freely.

  2. 2

    Listen for the fan motor to run when the unit is powered on.

  3. 3

    Check electrical connections to the fan motor.

  4. 4

    If the motor or its control system is faulty, professional service is required.

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 7)Search more codes in this manual