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RUN/ERROR LEDs: 5 flashes/sec RUN, Solid ON ERROR

Run and Error LEDs flash rapidly — Execution start-up aborted, Boot is running

Carrier · 38AP Air Handler

What does RUN/ERROR LEDs: 5 flashes/sec RUN, Solid ON ERROR mean?

The controller's startup process has been aborted, and it is currently in the bootloader mode. This may occur after a firmware update or a critical error.

Common Causes

  • Startup process aborted
  • Firmware update in progress or interrupted
  • Bootloader mode active

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Allow the boot process to complete.

  2. 2

    If the controller does not recover, attempt a power cycle.

  3. 3

    If the issue persists, refer to firmware update procedures or contact support.

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