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10.3.3 Indoor DC fan motor malfunction
Indoor Display
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
terminals on indoor
Turn off power switch,and pull out the fan motor.
Measure t he resistanc e s between b al ck l in e ( 0 V ) and w hi te
line(15V) ,balck line (0V)and red line(310V) of indoor fan motor .
The resistances range is
E14
parts damage may be occurred.
Check whether
pcb is well
YES
between 30KΩ with
2MΩ
NO
The indoor fan
motor is damaged
and need replace
NO
Pull out the term inals
the indoor mainboard and
reinsert them.
the ind oor pcb is dam aged
YES
and need replace
31
Service diagnosis
on
Domestic air conditioner
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