Haier HSU-18HEK03/R2 Service Manual page 38

Whether terminal CN8 and
CN9 on indoor PCB well
inserted or not?
NO
Electrify the machine again and turn it on in the cooling
operation, Measure voltage between the positions red wire
and black wire of Terminal CN9 on the indoor PCB
.
The voltage is about
90-200vac
Yes
Check whether motor
can run when turn on
the unit
When motor is running Measure
whether there
pulse(0-5VDC) between
positions 2 (middle wire) and
3( black wire) of Terminal CN8 on
the indoor PCB
The indoor pcb is damaged and need replace
Yes
is voltage
the
YES
Pull out and reinsert the terminals
NO
The indoor pcb is damaged and need replace
NO
the indoor motor is damaged and need replace
NO
The indoor motor is damaged and need
replace
35
Domestic Air Conditioner