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RUN/ERROR LEDs: 2 flashes/sec RUN, 1 flash/sec ERROR alternating

Run and Error LEDs flash in sequence — Controller is alone on the network

Carrier · 38AP Air Handler

What does RUN/ERROR LEDs: 2 flashes/sec RUN, 1 flash/sec ERROR alternating mean?

The controller is operating correctly but is the only device detected on its network segment. This may indicate a network configuration issue or that other devices are offline.

Common Causes

  • Controller is isolated on the network
  • Other network devices are offline or not connected
  • Network configuration issue

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Check network connections for other devices.

  2. 2

    Verify network configuration settings.

  3. 3

    Ensure other devices on the network are powered on and functioning.

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