Daikin fault codes

What each code means, in plain engineer English — and which UK models it applies to, from the manufacturer's own service literature. Anyone can tell you what U4 stands for; the model list is the part that took the manuals.

Split air conditioning

U4 U0 A5 A6 E7 C4 C9 J3 J6 H9 P4 E5 E6 H6 L5 F3 F6 L4 U2 A1 E1 UA H8 EA H0 L3

Knowing the code is the easy half

The app takes the same code and walks the fix: what to measure first, the expected values for your exact model, and a diagnosis that tells you when the machine isn't actually broken. Other makes — Mitsubishi, Fujitsu, Panasonic, LG, Samsung and more — are in the app too.

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Daikin fault codes

Split air conditioning

Altherma heat pumps

Knowing the code is the easy half