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Left lamp blinks 0.5-second ON 0.5-second OFF

Left lamp blinking 0.5 seconds ON/OFF — Indoor and outdoor units not operating

Mitsubishi Electric · Air Conditioning

¿Qué significa Left lamp blinks 0.5-second ON 0.5-second OFF ?

The indoor and outdoor units will not operate. This indicates the serial signal from the outdoor unit has not been received for 6 minutes. Check for wiring issues or signal interruptions.

Causas comunes

  • Miswiring between indoor and outdoor units
  • Serial signal interruption
  • Outdoor unit not receiving signal

Pasos de reparación & Lista de verificación

Haga clic en los pasos para seguir su progreso.

  1. 1

    Refer to the section 'How to check miswiring and serial signal error'.

  2. 2

    Check the compressor protector status in the outdoor unit service manual.

  3. 3

    Ensure all wiring connections are secure.

Ver todos los códigos en este manual (170)
Datos técnicos verificados. Última actualización: April 2026

Fallas relacionadas

0.5-second ON / 0.5-second OFF blinkUpper lamp blinks 0.5-second ON/OFF - Miswiring or serial signal error00Normal operation - No error codes1 beep during error display mode1 beep during error display mode - Unit has an error (different code)
Fuente: Mitsubishi Electric Air Conditioning
Open Manual (Page 39)Buscar más códigos en este manual