Midea PC 40 fault code

What it means

Outdoor main ↔ compressor-drive comms error

Safety: Safe isolation, then TREAT THE DC LINK AS LIVE. The electrolytic capacitors hold a lethal charge after the supply is off. Discharge through a resistor across the + and − terminals (Gree specifies approx. 100 Ω 20 W, Toshiba approx. 100 Ω 40 W) and confirm with a meter on DC before touching the board. Never short the terminals with a screwdriver.

UK models this code applies to

From the Midea service literature we hold (Midea Breezeless 3D INV service manual SM_FA(GA)_R32 (midea.com), §2.1 error-code table) — not a scraped list.

Now the harder half: proving what caused it

PC 40 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.