Service diagnosis
35
Domestic air conditioner
Indoor Display
■ □ ★/
E14
Method of
Malfunction
The rotation speed detected by the Hall IC during fan motor operation is used to determine
abnormal fan motor operation
Detection
Malfunction when the detected rotation feedback signal don’t received in 2 minutes
Decision
Conditions
Supposed
Causes
■ Operation halt due to breaking of wire inside the fan motor.
■ 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
parts damage may be occurred.
Check whether
terminals on indoor
pcb is well
Pull out the terminals on
the indoor mainboard and
reinsert them.
Turn off power switch,and pull out the fan motor.
Measure the resistances between balck line (0V)and white
line(15V) ,balck line (0V)and red line(310V) of indoor fan motor .
The
resistances range is
between 30K
Ω
with
2M
Ω
The
indoor fan
motor is damaged
and need replace
NO
YES
NO
YES
the indoor pcb is damaged
and need replace
10.3.3 Indoor DC fan motor malfunction
Summary of Contents for 1U18REJFRA
Page 11: ...Pinping diagrams Domestic air conditioner 4ˊPiping diagrams 9 EEV EEV ...
Page 12: ...Operation range Domestic air conditioner 5 Operation range 10 10 0 21 27 35 20 40 60 43 20 40 ...
Page 39: ...Service diagnosis 37 Domestic air conditioner ...
Page 46: ...Service diagnosis 44 Domestic air conditioner ...
