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HSU-09/12HR03/R2(DB)
Domestic air conditioner5
52
Service diagnosis
7.3.2
Indoor fan motor malfunction
Indoor Display
E14
Method of
The rotation speed detected by the Hall IC during fan motor operation is used to
Malfunction
determine abnormal fan motor operation
Detection
Malfunction
when the detected rotation feedback singal don’t receiced in 2 minutes
Decision
Conditions
Supposed
Ƶ
Operation halt due to breaking of wire inside the fan motor .
Causes
Ƶ
Operation halt due to breaking of the fan motor lead wires
Ƶ
Detection error due to faulty indoor unit PCB
Yes
Yes
NO
YES
whether terminal CN13
and CN7 on indoor PCB
well inserted or not?
Pull out and reinsert the terminals
Electrify the machine again and turn it on in the cooling operation,
Measure voltage between the positions 1 (
blue wire) and 3( yellow
wire) of Terminal CN
13 on the indoor PCB
NO
the indoor pcb is damaged and need replace
the voltage is about
90-200vac
check whether motor can
run when turn on the unit
the indoor motor is damaged and need replace
NO
When motor is running Measure whether
there is voltage pulse(12VDC) between
the positions 1(middle wire) and 4( black
wire) of Terminal CN7 on the indoor PCB
is nomal or not?
the indoor motor is damaged and need replace
the indoor pcb is damaged and need replace
NO
YES