Haier H2SM-(9+12)HEK03/R2 Service Manual page 55

Check whether the linking
cable between the indoor and outdoor is
not well connected
YES
If unit A have error ,
please turn on A and B both check
whether B is fine
NO
Please check whether
the connecting of L or N is reversed
of the two units
NO
Check whether
the LED1 on the outdoor PCB is on
NO
Check whether
the voltage of CN7 in outdoor pcb
is about 198-253VAC
YES
Check whether the
voltage of CN4
in outdoor pcb is about 12VAC
YES
The outdoor PCB is damaged
H2SM-(9+12)HEK03/R2
Reconnect the linking cable
YES
please reverse the outdoor
connecting wires A(C) and B
YES
(C) between unit A and B
YES
Reconnect the L and N wires
YES The outdoor PCB is damaged
Check whether
NO
fuse of outdoor pcb is broken
Check whether the wire from
terminal block to out pcb is well
connected
NO
The transformer is bad
53
If A is error and B is fine, indoor
If A is fine and B has error,the
outdoor unit main PCB is damaged
YES
NO
Domestic Air Conditioner
Service Diagnosis
unit A PCB is damaged
Reaplace the fuse with
T3.15A 250V
Reconnect the linking wire