Midea MSV1-09HRDN1, Service Manual

Page: 36 / 44

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