Midea MCH2U-18PHH2 Service Manual page 80

8.4.2.9 P2 (Low pressure protection) diagnosis and solution.
Error Code
Malfunction conditions
Potential causes
Trouble shooting:
P2
If the sampling voltage is not 5V, the LED will display the
failure.
● Wiring mistake
● Faulty over load protector
● System block
● Faulty outdoor PCB
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