Midea M2OC-18HRDN1-M - Page 34

Outdoor unit display LED STATUS
E7 Communication error between outdoor IC and DSP
Is the LED in outdoor main PCB light?
1.Is the +5 voltage in outdoor main board?
Power Board: CN4, Red wire and yellow (GND)
Outdoor main PCB: CZ1
2.Is the +12v voltage in outdoor main board?
Power Board: CN1, Purple wire and yellow (GND)
Inverter module defective.
Rectifier circuit i
s bad connection or
defective when the voltage in outdoor is
abnormal .
P and N 310V~380V(DC)
No
Yes
No
Yes
Check the signal wires between outdoor
PCBs, is it connected good.
Replace the main control board
Replace the IPM module
No