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RUN/ERROR LEDs: 5 flashes/sec RUN, Off ERROR

Run LED flashes rapidly, Error LED off — Firmware transfer in progress, Boot is running

Carrier · 38AP Air Handler

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

The controller is in the bootloader mode, actively transferring firmware. The unit will restart automatically once the transfer is complete.

Common Causes

  • Firmware update in progress
  • Controller is in bootloader mode

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Do not interrupt power during firmware transfer.

  2. 2

    Wait for the firmware transfer and installation to complete.

  3. 3

    The unit should restart automatically.

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