7.2.2
Indoor fan motor malfunction
Indoor Display
E14
Method of
The rotation speed detected by the Hall IC during fan motor operation is used to determine
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 wire inside the fan motor .
■
Operation halt due to breaking of the fan motor lead wires
■
Detection error due to faulty indoor unit PCB
Yes
Yes
YES
NO
whether terminal CON12
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 ( red wire) and
3(
black wire) of Terminal CON12 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
th
e unit
the indoor motor is damaged and need
replace
NO
When motor is running Measure
whether there is voltage pulse(0-5VDC)
between the
positions 2 (middle wire)
and 3(
black wire) of Terminal CN7 on
the indoor PCB
the indoor motor is damaged and need
replace
the indoor pcb is damaged and need replace
NO
YES
HSU-18,22HVA103/R2(DB) Service Diagnosis
78
Domestic Air Conditioner
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