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[121] power supply of inverter board is abnormal
check if wire between
control PCB and inverter board
is abnormal
check if communication
circuit of main control PCB is
abnormal(if signal LED
flashes abnormally)
solve the failures due to
relative information
replace main control board
adjust communication wire
yes
no
no
no
yes
yes
no
yes
check if voltage of power
supply on inverter control board
is normal
if circuit of inverter control
board is abnormal
improve power supply circuit
replace power module
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