Haier 2HUM18HC03/R2 Service Manual page 55

Check whether terminals
on indoor pcb is well ?
Electrify the machine again and turn it on in the cooling operation,
Measure voltage between the positions 1and 3 of Terminal CN5
on the indoor PCB
the voltage is about 90-220vac
check whether motor can run
when turn on the unit
the indoor motor is damaged and need replace
2HUM18HC03/R2(DB)-SM
or else parts damage may be occurred.
Yes
52
Pull out the terminals on the indoor
mainboard and reinsert them.
Measure whether there is voltage pulse(0-5VDC)
between the positions middle wire and black wire
of Terminal CN2 on the indoor PCB
Is it ok?
the indoor pcb is damaged and need replace
Wiring diagrams
Domestic air conditioner