Midea PC 40 fault code
Midea air conditioning
What the Midea PC 40 fault code means, from the manufacturer's own service literature, and the UK models it applies to.
What it means
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 suitable resistor across the + and − terminals and confirm with a meter on DC before touching the board. Never short the terminals with a screwdriver.
Source: Midea Breezeless 3D INV service manual SM_FA(GA)_R32 (midea.com), §2.1 error-code table
UK models this code applies to
Tap yours to open PC 40 on that machine.
Wall-mounted14
Cassettes12
Ducted12
Ceiling or floor5
Floor consoles5
PC 40 on these comes from each model's own manual, which may not match the meaning above — tap yours to read it.
Wall-mounted17
Ducted7
Outdoor units3
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.
Chase PC 40 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.
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