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

Run and Error LEDs flash in sequence — Controller running with 5-minute auto-restart delay

Carrier · 38AP Air Handler

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

The controller is indicating normal operation but has entered a 5-minute auto-restart delay following a system error. The controller will attempt to restart automatically after this delay.

Common Causes

  • System error has occurred
  • Controller is in a post-error recovery state

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Wait for the 5-minute auto-restart delay to complete.

  2. 2

    Observe the unit's operation after the delay.

  3. 3

    If the error recurs, investigate the cause of the previous system error.

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