Mitsubishi Air Conditioner Error U6

⚡ Quick Answer: The Mitsubishi Air Conditioner error code U6 signifies a communication failure between the indoor and outdoor units, often due to a compressor overcur... ✅ DIY Fixable

What Does Error U6 Mean?

The Mitsubishi Air Conditioner error code U6 signifies a communication failure between the indoor and outdoor units, often due to a compressor overcurrent or overload trip. This can lead to the unit ceasing operation and displaying the U6 error, which may be preceded by normal function. It is crucial to address this issue promptly, as it may indicate a severe fault in the power module or associated wiring.

Common Symptoms:

  • Unit stops operation and displays U6 code
  • Outdoor unit fault indicated on remote or unit display
  • Possible previous operation before shutdown

Possible Causes

  • Compressor overcurrent / overload trip (high)

How to Fix Error U6

DIY Fix Basic Checks Before Calling Service

  1. Turn off the AC unit and disconnect power for a few minutes.
  2. Check for obvious issues like blocked outdoor unit airflow or dirty filters.
  3. Ensure power supply voltage is within correct range (very low voltage can contribute to overload conditions).

Technician Only Professional Diagnosis and Repair

  1. Inspect outdoor unit compressor current and measure against specifications.
  2. Check inverter power module and associated PCBs for faults or damaged components.
  3. Verify refrigerant charge and system pressures to rule out mechanical overload causes.
  4. Replace defective power module or compressor as indicated by measured faults.

Parts needed: Compressor, Inverter power module (power board), Associated wiring harnesses

🛑 When to Call a Pro:
  • Repeated U6 code after basic checks
  • Unit does not restart or runs very briefly before fault
  • Odors, smoke, or unusual noises accompany the error

Technical Specifications

wattage N/A
component Control Board
resistance N/A
part_number Mitsubishi 9349A123
voltage_rating 220V AC

Common Questions

What does U6 error mean on Mitsubishi Air Conditioner?

The U6 error indicates a communication failure between the indoor and outdoor units, often due to a compressor overload.

Can I fix Mitsubishi Air Conditioner U6 error myself?

Yes, you can perform basic checks like turning off the unit, checking airflow, and ensuring proper voltage before calling for service.

How much does it cost to fix U6 error?

The estimated repair cost for a U6 error ranges from ¥30,000 to ¥150,000, depending on the specific issue and unit size.

When should I call a technician for U6?

Call a technician if the U6 code persists after basic checks, if the unit does not restart, or if you notice odors, smoke, or unusual noises.

Data last verified: 2026-07-07

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