Haier HSU-18,22HVA103/R2(DB) Service Manual page 79

7.2.2 Indoor fan motor malfunction
Indoor Display
E14
Method of The rotation speed detected by the Hall IC during fan motor operation is used to determine
abnormal fan motor operation
Malfunction
Detection
Malfunction when the detected rotation feedback singal don't receiced in 2 minutes
Decision
Conditions
Supposed Causes ■
■
■
whether terminal CON12
and CN7 on indoor PCB
well inserted or not?
Electrify the machine again and turn it on in the cooling operation,
Measure voltage between the
black wire) of Terminal CON12 on the indoor PCB
3(
the voltage is about
90-200vac
check whether motor can
run when turn on
the unit
Yes
the indoor motor is damaged and need
replace
HSU-18,22HVA103/R2(DB)
Operation halt due to breaking of wire inside the fan motor .
Operation halt due to breaking of the fan motor lead wires
Detection error due to faulty indoor unit PCB
NO
red wire)
positions 1 ( and
Yes
NO
YES
Pull out and reinsert the terminals
the indoor pcb is damaged and need replace
NO
When motor is running Measure
whether there is voltage pulse(0-5VDC)
between the
black wire) of Terminal CN7 on
and 3(
the indoor PCB
NO
the indoor motor is damaged and need
replace
the indoor pcb is damaged and need replace
78
Service Diagnosis
wire)
positions 2 (middle
Domestic Air Conditioner
YES