Daikin Mini Split F6 Error Code

Updated 2026-08-30 · review status: manual-verified · reviewed by MiniSplitDecoder Editorial Team Last verified: 2026-08-30

Check your model first

  • ACLogics Daikin service documentation (F6 split/multi-split, SkyAir)
  • SplitAtlas (AURORA R-32)
  • hvac.codes / BOYLA (F6-00) / The Aircon Bible

Match the model on your equipment label to the linked manufacturer documentation. The same code can mean different things across model families.

Quick answer

Daikin F6 means abnormally high refrigerant pressure (commonly refrigerant overcharge) detected in cooling mode, so the system limited or stopped cooling. Clean filters and clear the outdoor airflow once and reset; if F6 returns, stop - pressure, charge, and sensor work is licensed-technician only.

Severity: high · DIY difficulty: easy

Safety

Stop at the breaker power-cycle and any plug-accessible checks (filters, remote settings, visible wiring). The outdoor unit's capacitor holds a lethal charge and the refrigerant circuit is both pressurized and (on R-32 units) flammable — opening panels or servicing the sealed system is licensed-technician work (EPA 608).

What F6 means

F6 means abnormal high pressure or refrigerant overcharged (cooling-mode protection): the system detected pressure/temperature conditions above the safe limit and limited or stopped cooling. Daikin SkyAir/split service documentation (via ACLogics) lists refrigerant overcharge and disconnected heat-exchanger deicer or outdoor-air thermistors as causes; F6-00 variants on heat pumps read as abnormally high refrigerant pressure on the outdoor unit. One blog source wrongly pairs F6 with communication failure - the manufacturer-aligned references agree on high pressure/overcharge.

Code meaning varies by series

  • ACLogics Daikin service documentation (F6 split/multi-split, SkyAir): F6 = abnormal high pressure or refrigerant overcharged - overcharge, disconnection of heat exchanger deicer thermistor, disconnection of outdoor air thermistor
  • SplitAtlas (AURORA R-32): F6 = system limited or stopped cooling because pressure/temperature conditions were too high - airflow is the safest homeowner check
  • hvac.codes / BOYLA (F6-00) / The Aircon Bible: F6 = refrigerant overcharge / abnormally high refrigerant pressure on the outdoor unit - call a pro; check charge and outdoor coil

First checks before service

This page currently documents the safe reset triage. If the code returns, use the linked source manual or a qualified technician for code-specific diagnosis.

  1. 1. One-time fault event (power disturbance or transient sensor reading) common DIY

    Check: Power-cycle at the breaker/disconnect (or unplug for CPAP), restore, and run the system while watching for the code.

    Fix: If the code does not return after a full run cycle, the fault was transient — monitor, no repair needed.

  2. 2. Fault persists after a clean reset occasional pro only

    Check: If the code returns immediately or every session, note the conditions (startup, heating, after rain).

    Fix: A persisting code points at the component the manual assigns to this code — that repair is technician territory.

Related codes

Cross-references for the same fault family, by brand:

Daikin E3 · Daikin F3 · Daikin E9

Commonly searched as: "daikin f6" · "daikin error code f6" · "daikin air conditioner f6"

Sources

Related Mini Split guides

Mini-Split Communication Error: DIY Checks · Mini-Split Flashing Light Decoder: Blink Patterns · Mini-Split Maintenance Checklist: Seasonal DIY Tasks · Mini-Split Not Cooling: Ranked Causes and DIY Checks