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Check whether Terminal on the outdoor
mainboard is well inserted.
it is normal
YES
Electrify the machine again and turn it on in
the Cool state with the remote controller.
check whether the motor could run.
NO
R emove fan m otor af te r s witch off
the power.Measure the resistances
between black line (0V) and red
line( 310V),between black line(0V)
a nd w hi te l in e ( 1 5 V ) of th e fan
motor .
The resistances are
greater than 40KΩ
NO
The motor of the outdoor unit is
damaged and needs replacing.
10.3.5 IPM protection
Outdoor display:
LED1 flash 2 times
Method of
IPM protection is detected by checking the compressor running condition and so on
Malfunction
Detection
Malfunction
■ The system leads to IPM protection due to over current
Decision
■ The compressor faulty leads to IPM protection
Conditions
■ circuit component of IPM is broken and led to IPM protection
NO
Reinsert the terminals
YES
the resistances between 0V
YES
and 310V,between 0V and 15V of
the fan terminal of outdoor pcb are
greater than 10MΩ.
The outdoor pcb is
damaged, replace it
with a new one.
31
The motor and
outdoor pcb are
well
NO
Installations
The module pcb is
YES
damaged, replace it
with a new one.
Domestic air conditioner
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