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RUN/ERROR LEDs: 2 flashes/sec RUN, 3 flashes/sec ERROR alternating

Run and Error LEDs flash in sequence — Controller has been formatted

Carrier · 38AP Air Handler

What does RUN/ERROR LEDs: 2 flashes/sec RUN, 3 flashes/sec ERROR alternating mean?

This indicates that the controller has just been formatted or reset to its factory defaults. Control programs may need to be reloaded.

Common Causes

  • Controller has been recently formatted or reset
  • Loss of configuration data

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Verify that the control programs and settings are correctly loaded.

  2. 2

    Check if any specific configuration steps are required after formatting.

  3. 3

    Consult the system's setup guide for re-configuration.

Browse all codes in this manual (60)
Verified technical data. Last updated: April 2026

Related Faults

A051A051 — Circuit A, Compressor 1 Stuck On Failure AlarmA052A052 — Circuit A, Compressor 2 Stuck On Failure AlarmA053A053 — Circuit A, Compressor 3 Stuck On Failure Alarm
Source: Carrier 38AP Air Handler
Open Manual (Page 214)Search more codes in this manual