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11-time blink (2.5-second OFF)

11-time blink 2.5-second OFF — Indoor fan motor rotational frequency feedback signal error

Mitsubishi Electric · Air Conditioning

What does 11-time blink (2.5-second OFF) mean?

The left lamp of the OPERATION INDICATOR blinks eleven times, followed by a 2.5-second pause. This indicates that the rotational frequency feedback signal from the indoor fan motor was not emitted for 12 seconds after the fan motor started operation.

Common Causes

  • Problem with the indoor fan motor.
  • Fault in the feedback signal circuit.
  • Disconnection in the indoor fan motor wiring.

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Turn OFF the power supply to the unit.

  2. 2

    Refer to Section 9-6, 'Check of indoor fan motor,' for detailed troubleshooting steps.

  3. 3

    Consider contacting a qualified technician to inspect the indoor fan motor and its connections.

Browse all codes in this manual (170)
Verified technical data. Last updated: April 2026

Related Faults

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)
Source: Mitsubishi Electric Air Conditioning
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