The indoor PCB fault，check whether the communication circuit on
the indoor PCB has been damaged, check especially some
important electric parts ,such as the optical coupler、 voltage
stabilizing diode、resistor、PTC ,and so on ;(Fig. 10)
The faulty cause：
1, hardware fault for PFC
2, the communication wire is broken off or connected
wrongly；、
3、the power ground wire isn’t connected reliably；、
4、the indoor PCB’s hardware has been damaged；
5, the outdoor PCB’s hardware has been damaged
7、The analysis of the complete units malfunction code
1、
Malfunction code：F1 （communications issue）
Y
Turn on the power
1、 Refer to the connecting diagram (Fig 1~9)，check
whether the wire is connected correctly.
2、 Please screw again to make the wire firm.
Whether the communication wire is
connected wrongly or disentwined.
N
Y
Change indoor PCB.
N
The outdoor PCB fault , check whether the communication circuit on the outdoor
PCB has been damaged，check especially some important electric parts ,such as
the optical coupler、voltage stabilizing diode、resistor、PTC and so on ；Please
replace the PCB if being abnormal (Fig. 11)
Check whether PFC of outdoor controller
is normal.（Re. Fig 1，check whether the
voltage between the point of P and N is
about 300V）
hardware fault for PFC，change
PFC board.
N
Y
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