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Indoor unit no power

Indoor unit OPERATION INDICATOR lamp does not light up — No power to indoor unit

Mitsubishi Electric · Air Conditioning

Was bedeutet Indoor unit no power ?

When you turn on the power supply and press the emergency operation switch, the left lamp of the OPERATION INDICATOR on the indoor unit does not light up. This indicates that the indoor unit is not receiving electrical power.

Häufige Ursachen

  • No rated voltage in the main power supply (e.g., tripped breaker, unplugged unit)
  • Problem with the power supply to the outdoor unit terminal block
  • Miswiring or disconnection of the indoor/outdoor connecting wire
  • Poor contact at the indoor terminal block

Reparaturschritte & Checkliste

Klicken Sie auf Schritte, um Ihren Fortschritt zu verfolgen.

  1. 1

    Check that the main power supply (circuit breaker or wall socket) for the air conditioner is turned ON.

  2. 2

    Ensure the air conditioner's power plug is fully and correctly inserted into the wall socket.

  3. 3

    Press the emergency operation switch once to confirm if the left lamp of the OPERATION INDICATOR lights up.

  4. 4

    Visually inspect the indoor/outdoor connecting wires for any signs of disconnection, damage, or miswiring.

Alle Codes in diesem Handbuch durchsuchen (170)
Verifizierte technische Daten. Zuletzt aktualisiert: April 2026

Verwandte Fehlercodes

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)
Quelle: Mitsubishi Electric Air Conditioning
Open Manual (Page 29)Mehr Codes in diesem Handbuch suchen