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Red LED 7 flashes

Red LED flashes seven times — Reverse phase detected

Carrier · 38AP Air Handler

What does Red LED 7 flashes mean?

The phase sequence of the incoming power to the compressor is incorrect. This will immediately stop the compressor and lock it out after one alert. A power cycle is required to clear the lockout.

Common Causes

  • Incorrect incoming power phase sequence
  • Incorrect wiring of compressor phase leads

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Check the incoming power phase sequence.

  2. 2

    Verify the compressor contactor wiring.

  3. 3

    Ensure the module phase wiring (A-B-C) is correct.

  4. 4

    Cycle power to the module to clear lockout.

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 143)Search more codes in this manual