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16

Error 16 — Possible lack of refrigerant

Lennox · EL18KSLV Series Outdoor Units

What does 16 mean?

This error code suggests the system may be low on refrigerant. Check the system's refrigerant charge.

Common Causes

  • Low refrigerant charge
  • Refrigerant leak

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Recover and check the system charge.

  2. 2

    Inspect for any signs of refrigerant leaks.

  3. 3

    Recharge the system if necessary.

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 69)Search more codes in this manual