Midea MSV1-09HRDN1 Service Manual page 36

Disconnect the power supply, after 1 minutes, connect the power supply , turn on the
unit using remote controller, does the unit work normally ?
NO
Does the led on outdoor control board bright?
NO
Is the voltage on terminal CZ1 and CZ2 of the outdoor main PCB is 5V?
No
Is the voltage between P and
N on inverter module 380V?
NO
Replace the outdoor power
supply board.
13.1.3
Display
E2
Is power supply right?
Is connector connection good?
Indoor PCB is defective
Replace the indoor control board.
13.1.4
Display
E3
32
Yes
Zero-crossing examination error
Yes
Yes
Fan speed beyond control
Service manual
Is the connection on outdoor control board and
between indoor and outdoor unit good? Does the L、
N connect good? Does the S wire connect reliably?
YES
Replace the module board.(The
power supply of PCB is supplied
by the module board.)
No
Replace the outdoor main
PCB
LED STATUS
LED STATUS
YES