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[9]

Error 9 — DC fan motor fault

Lennox · EL18KSLV Series Outdoor Units

What does [9] mean?

The DC fan motor is damaged, not connected, or the related circuit is broken. The error will lock if it occurs 4 times within 60 minutes.

Common Causes

  • The fan motor wiring is loose.
  • The fan motor is damaged.
  • The main control board (PCB) is faulty.

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Check if the fan motor wires are conductive and if the motor is running.

  2. 2

    Power off the unit and try rotating the fan motor by hand to see if it turns freely.

  3. 3

    Verify the terminal voltage is correct.

  4. 4

    Replace the fan motor if it's not operating correctly.

  5. 5

    Replace the PCB if the motor is functional but the error persists.

Browse all codes in this manual (43)
Verified technical data. Last updated: April 2026

Related Faults

1Error 1 — EEPROM malfunction or damage10Error 10 — Outdoor defrost sensor failure11Error 11 — Suction temperature sensor failure
Source: Lennox EL18KSLV Series Outdoor Units
Open Manual (Page 72)Search more codes in this manual