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Green LED 3 flashes

Green LED flashes three times — Short cycling detected

Carrier · 38AP Air Handler

What does Green LED 3 flashes mean?

The compressor has cycled on and off too frequently, running for less than one minute per cycle. This warning is active if the compressor has short cycled more than 48 times in 24 hours and the 'Short Cycling' DIP switch is OFF.

Common Causes

  • Compressor running for less than 1 minute per cycle
  • DIP switch for short cycling protection is set to OFF

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Ensure the 'Short Cycling' DIP switch is set correctly (check manual for intended setting).

  2. 2

    Verify proper wiring connections to the module.

  3. 3

    Monitor compressor runtime and cycle frequency.

  4. 4

    If the issue persists, consult a technician.

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