Service diagnosis
7.4.5 IPM protection
Indoor display F1
Outdoor display: LED1 flash 2 time
Domestic air conditioner
The motor of the outdoor unit is
damaged and needs replacing.
The PCB of the outdoor unit is
damaged and needs replacing
Method of
malfunction
detection
Malfunction
detection
conditions
Supposed
causes
Measure the voltage between 3
and 6 of the terminal about 0-5v.
YES
Measure the voltage
between 1 and 3 of the terminal
of fan motor on the PCB about DC310V,
Measure the voltage between 3 and 4 o
f
the terminal about DC15V. Measure the
voltage between 5 and 3 of the
terminal about 1-6v.
NO
YES
IPM protection is detected by checking the compressor running condition.
ƵThe system problem cause IPM over-current protection
ƵThe compressor faulty leads to IPM protection
ƵCircuit component of IPM is broken and lead to IPM protection
ƵThe system problem cause IPM over-current protection
ƵThe compressor faulty leads to IPM protection
ƵCircuit component of IPM is broken and lead to IPM protection
Troubleshooting
'
Be sure to turn off power switch before connect or disconnect connector, or
else
parts damage may be caused
2##!3#)##
4
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