Gree H3 fault code

What it means

Compressor overload protection

The compressor's overload protector has opened. Treat it as a symptom — find what made the compressor work that hard.

Safety: Discharge pipework runs very hot — allow it to cool before handling.

UK models this code applies to

From the Gree service literature we hold (Gree (Zhuhai) Service Manual, Bora Inverter R32 §9.1 Error Code List) — not a scraped list.

Now the harder half: proving what caused it

H3 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.