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Red LED 3 flashes

Red LED flashes three times — Short cycling lockout

Carrier · 38AP Air Handler

¿Qué significa Red LED 3 flashes ?

The compressor is locked out due to excessive short cycling. This occurs when the 'Short Cycling' DIP switch is ON and the compressor cycles on and off too frequently (less than 1 minute runtime) within a 24-hour period. A power cycle is required to clear the lockout.

Causas comunes

  • Compressor short cycling frequently
  • Short Cycling DIP switch is set to ON
  • Incorrect system settings or demand

Pasos de reparación & Lista de verificación

Haga clic en los pasos para seguir su progreso.

  1. 1

    Ensure the 'Short Cycling' DIP switch is set correctly.

  2. 2

    Cycle power to the module (disconnect T2 or T1 for 5 seconds) to clear lockout.

  3. 3

    Verify proper wiring connections.

  4. 4

    Address the cause of excessive short cycling (e.g., undersized system, thermostat settings).

Ver todos los códigos en este manual (60)
Datos técnicos verificados. Última actualización: April 2026

Fallas relacionadas

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
Fuente: Carrier 38AP Air Handler
Open Manual (Page 143)Buscar más códigos en este manual