Daikin Air Conditioner Error F6

⚡ Quick Answer: The Daikin air conditioner F6 error indicates a communication failure between the indoor and outdoor units, often caused by high refrigerant pressure ... ✅ DIY Fixable

What Does Error F6 Mean?

The Daikin air conditioner F6 error indicates a communication failure between the indoor and outdoor units, often caused by high refrigerant pressure or temperature anomalies. This error can manifest as the unit stopping during operation or self-check, with the F6 code flashing on the controller. Common underlying issues include refrigerant overcharge, malfunctioning outdoor temperature sensors, or airflow problems in the outdoor unit.

Common Symptoms:

  • Air conditioner stops operation shortly after start or during self‑check
  • Error code “F6” displayed on remote/controller
  • Possible abnormal heat/pressure conditions in outdoor unit

Possible Causes

  • Refrigerant overcharge (excessive refrigerant pressure detected) (medium)
  • Outdoor temperature sensor (thermistor) malfunction or disconnection (medium)
  • Outdoor heat exchanger over‑temperature due to fan motor or airflow issue (medium)

How to Fix Error F6

DIY Fix Restart and basic checks

  1. Turn off the air conditioner via remote and breaker for 1–2 minutes.
  2. Ensure outdoor unit is free of debris and obstructed airflow.
  3. Restart the unit and monitor if F6 reappears.

Technician Only Diagnose outdoor unit pressure/sensor circuits

  1. Check refrigerant pressure and confirm compliance with specifications.
  2. Test outdoor thermistors (air, liquid pipe, heat exchanger) for continuity and correct response.
  3. Verify outdoor fan motor operation and airflow performance.
  4. Inspect electronic expansion valve and related control signals.

Parts needed: Refrigerant charge/pressure testing equipment, Thermistors (outdoor air, liquid line, heat exchanger), Fan motor, Electronic expansion valve

🛑 When to Call a Pro:
  • F6 error persists after restart
  • Unusual noises from outdoor unit
  • No cooling/heating and error returns repeatedly

Technical Specifications

wattage N/A
component Control Board
resistance N/A
part_number DAIKIN 4E6E1A
voltage_rating 220V AC

Common Questions

What does F6 error mean on Daikin air conditioner?

F6 indicates a communication failure due to high pressure or temperature in the outdoor unit.

Can I fix Daikin air conditioner F6 error myself?

Yes, try turning off the unit for 1-2 minutes and ensuring the outdoor unit is clear of debris.

How much does it cost to fix F6 error?

Repair costs can range from ¥10,000 to ¥50,000+, depending on parts and labor required.

When should I call a technician for F6?

Call a technician if the F6 error persists after restart or if you hear unusual noises from the outdoor unit.

Data last verified: 2026-07-07

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