Service diagnosis
35
Domestic air conditioner
10.4.5 IPM protection
Outdoor display F1˖LED1 flash 2 times
IPM protection is detected by checking the compressor running condition and so on
Ŷ
The system leads to IPM protection due to over current
Ŷ
The compressor faulty leads to IPM protection
Ŷ
circuit component of IPM is broken and led to IPM protection
Check whether Terminal on the outdoor
mainboard is well inserted.
Is it normal?
Yes
NO
Fasten the connection
Power on the unit and turn into Cool
mode. check whether the motor can
running˛
Yes
Measure whether the voltage between 3
and 6 is 0-5V approx.
Is it normal?
N0
The motor of the outdoor unit is damaged
and needs replacing.
1.Measure whether the voltage between 1 and 3 of the
motor socket on the PCB is DC310V approx.
2.Measure whether the voltage between 3 and 4 of the
socket is DC15V approx.
3.Measurewhether the voltage between 5 and 3 of the
socket is 0-6v approx.
NO
Is it normal?
The mainboard of the outdoor unit is
damaged and needs replacing
N0
Yes
Yes
Method of
Malfunction
Malfunction
Detection
Conditions
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