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Pb

11-time blink - Indoor fan motor issue

Mitsubishi Electric · Air Conditioning

What does Pb mean?

The operation indicator lamp blinks eleven times. This indicates that the indoor fan motor is not emitting a rotational frequency feedback signal after it should have started.

Common Causes

  • Indoor fan motor failure
  • Loose connection to the indoor fan motor
  • Faulty motor control board

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Refer to the manual section on checking the indoor fan motor.

  2. 2

    Inspect the wiring and connections to the indoor fan motor.

  3. 3

    Replace the indoor fan motor if necessary.

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
Open Manual (Page 37)Search more codes in this manual