Haier 1U25JEJFRA Service Manual page 37

10.3.3 Indoor DC fan motor malfunction
Indoor Display
■ □ ★/E14
Method of The rotation speed detected by the Hall IC during fan motor operation is used to determine
Malfunction abnormal fan motor operation
Detection
Malfunction when the detected rotation feedback signal don't received in 2 minutes
Decision
Conditions
Supposed ■ Operation halt due to breaking of wire inside the fan motor.
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, or else
Check whether
terminals on indoor
pcb is well
YES
Turn off power switch,and pull out the fan motor.
Measure t h e resistanc e s between b a l c k l i n e ( 0 V ) and w h i t e
line(15V) ,balck line (0V)and red line(310V) of indoor fan motor .
The resistances range is
between 30KΩ with
2MΩ
NO
The indoor fan
motor is damaged
and need replace
parts damage may be occurred.
NO
Pull out the terminals on
the indoor mainboard and
reinsert them.
the indoor pcb is damaged
YES
and need replace
35
Service diagnosis
Domestic air conditioner