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n3

n3 displayed — Cooling mode test running

Haier · Air Conditioning

What does n3 mean?

The system is running a cooling mode test. This display may appear during the start-up system check.

Common Causes

  • Start-up system check in progress
  • Outdoor ambient temperature is between -24°C and 46°C

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Allow the start-up system check to complete.

  2. 2

    If the display persists or an error occurs, ensure the outdoor ambient temperature is within the operational range.

  3. 3

    Refer to the service manual for further troubleshooting if needed.

Browse all codes in this manual (103)
Verified technical data. Last updated: April 2026

Related Faults

1Error Code 1 — Outdoor PCB EEPROM fault10Error Code 10 — Defrost sensor fault11Error Code 11 — Compressor suction temperature sensor fault
Source: Haier Air Conditioning
Open Manual (Page 6)Search more codes in this manual