Daikin F6 fault code

What it means

Abnormal high pressure / refrigerant overcharge

Daikin flags high pressure with refrigerant overcharge as the leading cause.

Safety: High-side pipework will be hot — take care.

UK models this code applies to

From the Daikin service literature we hold (Daikin CTXM/FTXM-M operation manual 3PEN393186-10J, malfunction-code table (remote self-diagnosis)) — not a scraped list.

Now the harder half: proving what caused it

F6 names a symptom, not a root cause. In the app, the same code opens a guided investigation: what to measure first, the expected values for your exact model, and an honest verdict — including “nothing in this machine is broken” when that's what the readings say.