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RUN light ON 2-time flash

RUN light ON, 2-time flash — Discharge pipe sensor error

MHI · Air Conditioning

What does RUN light ON 2-time flash mean?

The RUN light is on and flashes two times, indicating an error with the discharge pipe sensor. This sensor monitors the temperature of the refrigerant discharge pipe.

Common Causes

  • Broken discharge pipe sensor wire
  • Poor connector connection at the discharge pipe sensor
  • Gas shortage
  • Defective compressor
  • Defective outdoor unit boards

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Examine the discharge pipe sensor wire for any damage or loose connections.

  2. 2

    Ensure that the sensor is properly installed and making good contact with the discharge pipe.

  3. 3

    If the issue persists, turn off the power to the unit and contact your dealer for service.

  4. 4

    Confirm there are no visible leaks around the outdoor unit, which could indicate a gas shortage.

  5. 5

    Check that the outdoor unit fan is operating freely without obstruction.

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
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