Gree PU fault code

What it means

The DC link capacitors are not charging correctly at start-up. One measurement across the DC link settles this before anything is replaced.

Safety: DANGER: the DC link holds a lethal charge. This flow asks you to measure it LIVE — if you are not equipped and competent to take a live DC measurement inside the outdoor unit, isolate, discharge through a resistor (approx. 100 Ω 20 W across + and −, per Gree) and treat the fault as a board fault instead. Never short the terminals with a screwdriver.

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

UK models this code applies to

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PU 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

PU 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.

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