When the Outdoor Unit not power on: If the Indoor Unit terminal
board does not transmit 220V power, replace the Indoor Unit main
PCB; if the Outdoor Unit terminal board has 220V power, first check if
(fuse, reactor and bridge rectifier) are normal. There is still something
wrong, replace the whole set of Outdoor Unit control unit; for the
control unit composed of several function boards, try disconnecting the
weak-current data wires among several control boards and then power
the Outdoor Unit on, if the main PCB can be powered on and
initialized successfully, then it’s the module panel problems; if the
Outdoor Unit main PCB still cannot be powered on and initialized,
replace the Outdoor Unit main PCB.
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