Gree E4 fault code

What it means

Discharge temperature has risen far enough for the unit to protect the compressor. On a refrigeration circuit this is a charge, metering or heat-rejection question before it is an electrical one.

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

Source: Gree (Zhuhai) Service Manual, Bora Inverter R32 §9.1 Error Code List

UK models this code applies to

Tap yours to open E4 on that machine.

E4 on these comes from each model's own manual, which may not match the meaning above — tap yours to read it.

Now the harder half: proving what caused it

E4 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.

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

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