Haier HSU-09RS03/R2(SDB) Service Manual page 58

7.4.2 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
abnormal fan motor operation
Detection
Malfunction when the detected rotation feedback singal don't receiced in 2 minutes
Decision
Conditions
Supposed
Causes
Troubleshooting * Caution Be sure to turn off power switch before connect or disconnect connector,
Check whether Terminal on the indoor
/outdoor mainboard is well inserted.
Electrify the machine again and
Measure the voltage between 6 and 4
of the terminal about 0-5v.
the motor of the indoor /outdoor
unit is damaged and needs
replacing.
HSU-09/12RS03/R2(SDB)
Operation halt due to breaking of wire inside the fan motor .
Fan motor overheat protection
Operation halt due to breaking of the fan motor lead wires
Detection error due to faulty indoor unit PCB
or else parts damage may be occurred.
Is it normal?
Yes
turn it on in the Cool state with
the remote controller. check
whether motor can run
Yes
Is it normal?
N0
Reinsert the terminals
NO
NO
Measure the voltage between 1 and 4 of the terminal
of fan motor on the indoor mainboard about
DC310V,Measure the voltage between 5 and 4 of
the terminal about DC15V. Measure the voltage
between 7 and 4 of the terminal about 1-6v.
Yes
Is it normal?
Yes
The mainboard
indoor/outdoor unit is damaged
and needs replacing
55
Service Diagnosis
determine
N0
of the
Domestic air conditioner