Daikin Air Conditioner Error U6

⚡ Quick Answer: The Daikin air conditioner U6 error indicates a communication failure between the indoor units or between the indoor and outdoor units. This issue can... ✅ DIY Fixable

What Does Error U6 Mean?

The Daikin air conditioner U6 error indicates a communication failure between the indoor units or between the indoor and outdoor units. This issue can prevent the system from operating properly, leading to a lack of cooling. Common causes include problems with communication wiring or a failure in the control board/PCB interface.

Common Symptoms:

  • System stops operating with U6 displayed
  • Communication between indoor units (or indoor to outdoor) fails

Possible Causes

  • Communication wiring issue between indoor units (medium)
  • Control board / PCB communication interface failure (medium)

How to Fix Error U6

DIY Fix Basic power reset

  1. Turn off the air conditioner using the remote controller or main switch.
  2. Cut power at the breaker or unplug the unit.
  3. Wait approx. 1 minute.
  4. Restore power and attempt to restart.

Technician Only Inspect and repair communication wiring and control boards

  1. Check communication lines (N and P) between indoor units and outdoor unit for continuity, correct connections, and secure contacts.
  2. Use multimeter to verify signal integrity and continuity.
  3. Replace or repair damaged wiring or connectors.
  4. If wiring is intact, test indoor unit PCBs for communication interface failure and replace faulty boards.

Parts needed: Communication cables (N/P), Connectors, Indoor unit control board (PCB)

🛑 When to Call a Pro:
  • If repeated resets do not clear the error
  • If loose or damaged wiring is found inside the unit
  • If control board diagnostics indicate failures

Technical Specifications

wattage 1500W
component Compressor Control Board
resistance 3-10 ohms
part_number DAIKIN 4B188A
voltage_rating 230V AC

Common Questions

What does U6 error mean on daikin air conditioner?

U6 indicates a communication failure between indoor units, causing system stoppage.

Can I fix daikin air conditioner U6 error myself?

Yes, try a basic power reset by turning off the unit and waiting for 1 minute.

How much does it cost to fix U6 error?

Repair costs for the U6 error range from ¥10,000 to ¥50,000+, depending on parts and labor.

When should I call a technician for U6?

Call a technician if resets fail, wiring issues are found, or control board diagnostics show failures.

Data last verified: 2026-07-01

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