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6

Error 6 — Abnormal AC input over current

Lennox · EL18KSLV Series Outdoor Units

What does 6 mean?

Excessive current has been detected on the AC input by the compressor drive module or the input current exceeds the main board's setting.

Common Causes

  • AC input over current detected by compressor drive module
  • Input current higher than main board setting

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Check the AC input voltage and current.

  2. 2

    Verify the main board settings are correct.

  3. 3

    Inspect wiring for any signs of damage or loose connections.

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 66)Search more codes in this manual