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Outdoor control P.C. board LED repeats '3.6-second-OFF and 0.8-second-ON quick blinking'

Outdoor LED pattern: 3.6s OFF, 0.8s ON blink — Indoor/outdoor connecting wire fault

Mitsubishi Electric · Air Conditioning

What does Outdoor control P.C. board LED repeats '3.6-second-OFF and 0.8-second-ON quick blinking' mean?

The LED on the outdoor control P.C. board repeats a specific blinking pattern (3.6 seconds off, 0.8 seconds on). This pattern typically indicates an issue with the indoor/outdoor connecting wire.

Common Causes

  • Faulty indoor/outdoor connecting wire
  • Damage to the connecting wire
  • Poor connection at terminals

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Turn off the power supply.

  2. 2

    Inspect the indoor/outdoor connecting wire for damage, kinks, or loose connections.

  3. 3

    Replace the indoor/outdoor connecting wire.

  4. 4

    Ensure the wire is correctly installed and terminated.

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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