Midea M2OC-18HFN1-M Service Manual page 51

9.4.1.6 IPM module or IGBT over-strong current protection diagnosis and solution.
Malfunction decision
conditions
Supposed causes
Trouble shooting:
When the voltage signal that IPM send to compressor drive
chip is abnormal, the display LED will show "P6" and AC will
turn off.
● Wiring mistake
● IPM malfunction
● Outdoor fan ass'y faulty
● Compressor malfunction
● Outdoor PCB faulty