H2SM-14/18C03/R2
31
■ ■ ★ :Communication fault between indoor and outdoor system
Yes
NO
Yes
NO
YES
NO
YES
NO
NO YES
NO
YES NO
NO
YES
Check whether the linking cable
between the indoor and outdoor
is not well connected
Reconnect the linking cable;
If unit A have error , please turn
on A and B both，check whether B
is fine
please reverse the outdoor
connecting wires A(C) and B (C)
between unit A and B,
if A is error and B is fine, indoor
unit A PCB is damaged
if A is fine and B has error,the
outdoor unit main PCB is damaged
please check whether the
connecting of L or N is reversed of
the two units
reconnect the L and N wires
Check whether the LED1
on the outdoor pcb is on
the outdoor PCB is damaged
check whether the voltage of
CN7 in outdoor pcb is about
198-253VAC
check whether fuse of outdoor
pcb is broken
reaplace the fuse with
T3.15A 250V
check whether the voltage of
CN4
in outdoor pcb is about 12VAC
check whether the wire from
terminal block to out pcb is well
connected
Reconnect the linking
wire
the transformer is bad
the outdoor PCB is damaged
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