Indoor Ac Fan Motor Malfunction - Haier 2U14CS1ERA Service Manual

7.4.3 Indoor AC fan motor malfunction

Indoor Display E14
Method of
The rotation speed detected by the Hall IC during fan motor operation is used to
Malfunction
abnormal fan motor operation
Detection
Malfunction when the detected rotation feedback singal don't receiced in 2 minutes
Decision
Conditions
Supposed
Causes
Operation halt due to breaking of the fan motor lead wires
Detection error due to faulty indoor unit PCB
Troubleshooting * Caution Be sure to turn off power switch before connect or disconnect connector,
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 CN2
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
2U14CS1ERA-SM
Operation halt due to breaking of wire inside the fan motor .
Fan motor overheat protection
or else parts damage may be occurred.
Yes
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 CN7 on the indoor PCB
Is it ok?
the indoor pcb is damaged and need replace
56
Service diagnosis
determine
Domestic Air Conditioner