Haier 1U09BS2ERA - Indoor Ac Fan Motor Malfunction

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Service diagnosis
7.4.2 Indoor AC fan motor malfunction
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Indoor Display E14
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Domestic air conditioner
Method of
malfunction
detection
Malfunction
detection
conditions
Troubleshooting
The fan speed detected by the Hall IC during fan motor running which is used
to determine the fan motor operating
When there is no fan speed feedback signal within 2 minutes
ƵOperation stops due to fan motor wiring disconnection
ƵOperation stops due to wiring disconnection between PCB and indoor motor
ƵDetection error due to faulty indoor PCB
Supposed
causes
'  
Be sure to turn off power switch before connect or disconnect connector, or
else
parts damage may be caused
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The indoor PCB is damaged and need
replace
Electrify the machine again and turn it on in the
cooling mode, Measure whether there is voltage
60VAC-115VAC between the red wire and the black
wire of Terminal CN9 on the indoor PCB
The indoor PCB is damaged and need replace
NO
YES
NO
Whether terminal CN8 and CN9 on
indoor PCB well inserted or not?
Check whether motor can run when turn on the unit
YES
YES
When fan motor is running Measure whether there is
voltage pulse between the middle wire and the black
sidewireofTerminalCN8ontheindoorPCB.
No
Pull out and reinsert the terminal.
NO
The indoor motor is damaged and need
replace
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NO
The motor of the indoor unit is damaged
and need replace
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YES