Hitachi 00300 fault code

Hitachi air conditioning

What the Hitachi 00300 fault code means, from the manufacturer's own service literature, and the UK models it applies to.

Now the harder half: proving what caused it

00300 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 00300 on your machine →

Free, no sign-up. Pick the model: where we hold a chart for it, it takes you through one question at a time.

Or watch one get chased — free demo →

Or use it in your browser on any phone or laptop.