Haier H2SM-(9+12)HEK03/R2 - Page 52

H2SM-(9+12)HEK03/R2
Service Diagnosis
Domestic Air Conditioner
50
7.4.2 Indoor fan motor malfunction
Indoor Display E14
Method of Malfunction
Detection
The rotation speed detected by the Hall IC during fan motor
operation is used to determine abnormal fan motor operation
Malfunction Decision
Conditions
When the detected rotation feedback singal don’t receiced in 2 minutes
Supposed Causes
Operation halt due to short circuit inside the fan motor winding.
Operation halt due to breaking of wire inside the fan motor.
Operation halt due to breaking of the fan motor lead wires.
Dedection error due to faulty indoor unit PCB.
W hether terminal CN7 and CN13
on indoor PCB well inserted or not?
Pull out and reinsert the terminals
Electrify the machine again and turn it on in the
cooling operation,
Measure voltage between the
positions 1 ( red wire) and 5( black wire) of
Terminal CN7 on the indoor PCB
The voltage is about 90-200vac
Check whether motor can run when
turn on the unit
When motor is running Measure
whether there is voltage pulse(0-5VDC) between
the
positions 2 (middle wire) and 3( black wire)
of Terminal CN13 on the indoor
The indoor pcb is damaged and
need replace
The indoor motor is damaged and
need replace
The indoor motor is damaged
and need replace
The indoor pcb is damaged and need
replace
YES
YES
YES
YES
NO
NO
NO
NO