Daikin L3 fault code
Daikin split air conditioning
What it means
Electrical parts heat fault
The manual's wording: electrical parts heat fault — the switchbox/electrical compartment is running too hot, as distinct from L4 which is specifically the inverter heatsink.
Safety: The switchbox and heatsink run hot — allow to cool, and isolate before touching the board.
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
L3 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.
Chase this code in the app →