Indoor Ac Fan Motor Malfunction - Haier 1U12DR4EAA Service Manual

8.4.2.3 Indoor AC fan motor malfunction

Indoor Display E14
The rotation speed detected by the Hall IC during fan motor operation is used to determine
Method of
abnormal fan motor operation
Malfunction
Detection
when the detected rotation feedback signal don't received in 2 minutes
Malfunction
Detection
Conditions
Operation halt due to breaking of wire inside the fan motor.
Fan motor overheat protection
Operation halt due to breaking of the fan motor lead wires
Supposed
Detection error due to faulty indoor unit PCB
Causes
* Caution Be sure to turn off power switch before connect or disconnect connector,
Yes
Troubleshooting
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 indoor motor is damaged and need replace
damage may be occurred.
Check whether terminals
on indoor pcb is well?
Yes
the voltage is about 90-220vac
check whether motor can run
when turn on the unit
NO
Pull out the terminals on the indoor
No
mainboard and reinsert them.
NO
Yes
Measure whether there is voltage pulse(0-5VDC)
Yes
between the positions middle wire and black wire
of Terminal CN2 on the indoor PCB
NO
the indoor pcb is damaged and need replace
17
Service diagnosis
Is it ok?
Yes
Domestic air conditioner
or else parts