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EC

Outdoor Board LED1 (green) blinks twice and LED2 (red) blinks twice alternately - Startup time over

MHI · Air Conditioning

What does EC mean?

During startup, the outdoor unit's LED1 (green) blinks twice and LED2 (red) blinks twice alternately, indicating that the unit exceeded its allowed startup time.

Common Causes

  • Extended startup time due to an underlying issue.
  • Possible problem with compressor or outdoor unit components preventing quick startup.

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Turn off the main power supply to the unit, wait for at least 30 seconds, and then turn it back on.

  2. 2

    Ensure there are no obstructions around the outdoor unit that might impede its operation.

  3. 3

    If the issue recurs, a technician should inspect the outdoor unit's compressor and startup sequence.

Browse all codes in this manual (124)
Verified technical data. Last updated: April 2026

Related Faults

00Outdoor Board LED only green lights up after startup - No outdoor unit of address 0 / Remote controller transmission wire open1OPERATION INDICATOR lamp blinks 1 time (Pattern A) - Indoor/outdoor unit communication error (Transmitting error - Outdoor unit)14OPERATION INDICATOR lamp blinks 14 times (Pattern A) - Other errors
Source: MHI Air Conditioning
Open Manual (Page 59)Search more codes in this manual