Daikin H0 fault code

What it means

Sensor fault (compressor system)

The manual lists H0 simply as 'sensor fault'. On this platform it covers the compressor-system sensing — voltage/current detection — rather than a single named thermistor.

Safety: Safe isolation before working on the inverter board — capacitors hold charge.

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

H0 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.