Midea M3OA-27HRIN1

26
Display LED STATUS
E7 Indoor / outdoor units communication protection
Is the LED in outdoor main PCB light?
1.Is the +5 voltage in outdoor main board?
Power Board: CN1, Red wire and yellow (GND)
Outdoor main PCB: CZ1
2.Is the +12 voltage in outdoor main board?
Power Board: CN1, Purple wire and yellow (GND)
Inverter module defective.
Rectifier circuit is bad connection or
defective when the voltage in outdoor is
abnormal .
P3 and P4: 310V(DC);
P5 and P6: 310V(DC);
No
Yes
No
Check the PC817,PC851 (at Indoor main PCB and
outdoor main board)
Normally:
Input voltage: <5V, changeable
Output voltage:<24V, changeable
Yes
Check the signal wires between outdoor
PCB’s, is it connected good.
Check the PC521,PC851 (at Outdoor power PCB)
Normally:
Input voltage: <5V, changeable
Output voltage:<24V, changeable
Yes
Outdoor power PCB is defective.
No
Indoor PCB or outdoor main PCB
are defective.
Downloaded from AC-Manual.com Manuals