Daikin error code F6
What it means
High pressure control activated in cooling mode.
Possible causes
Dirty or blocked outdoor coil Excessive refrigerant charge Restricted airflow due to installation or closed service valves
Suggested fix
Assess condenser cleanliness and airflow, verify refrigerant charge and check valve positions and operating pressures; correct the underlying issue before clearing the code and returning the system to normal use.
Safety first. Isolate the power supply before inspecting any unit. Refrigerant-circuit
and electrical repairs must be carried out by a qualified, registered technician.
Other Daikin codes
- A1 — Indoor PCB defect or internal failure.
- A5 — Freeze-up protection activated for the indoor heat exchanger.
- A6 — Indoor fan motor fault.
- C4 — Faulty indoor heat exchanger temperature sensor.
- C9 — Faulty indoor suction air (room) temperature sensor.
- E1 — Outdoor circuit board fault.
- E7 — Outdoor DC fan motor fault.
- U0 — Refrigerant shortage or undercharge detected.
- U2 — Power supply voltage drop or main circuit overvoltage.
- U4 — Transmission failure between indoor and outdoor units.