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Green LED 4 flashes

Green LED flashes four times — Scroll thermistor issue

Carrier · 38AP Air Handler

What does Green LED 4 flashes mean?

The module detects an issue with the scroll NTC thermistor, indicating it may be open or shorted. This warning is not applicable to 38AP units.

Common Causes

  • Scroll NTC thermistor is open or shorted

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    This code is not applicable to the 38AP model.

  2. 2

    Verify the model compatibility if this code appears.

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