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IPM protection is detected by checking the compressor running condition and so on.
The system leads to IPM protection due to over current
The compressor faulty leads to IPM protection
circuit component of IPM is broken and led to IPM protection
IPM protection dues to the compressor faulty
IPM protection dues to faulty PCB of IPM module
Compressor wiring disconnected
Turn off the power.check if
the
compressor
Yes
Check the IPM module
Normal
Yes
Test the resistance values among
Phases U, V and W of compressor
If the resistance
are equal and less
Yes
Check the installation condition
Disconnect the compressor harness connector from the outdoor unit PCB.
To disengage the connector, press the protrusion on the connector.
Then, to measure resistance between P (+) andN (-) and the U, V and W terminals of the
compressor connector with a multi-tester. Evaluate the measurement results for a
pass/fail judgment.
N(-)terminal
of
tester(P(+)for
tester)
P(+)terminal
of
tester(N(-)for
tester)
Normal resistance
Unacceptable resistance
HSU09VHJ DB -SM
Be sure to turn off power switch before connect or disconnect connector,
else parts damage may be occurred.
NO
wiring
NO
NO
.
digital
P(+)
digital
UVW
Several k to several M ( )
Short (0 ) or open
54
Renewedly connect the wiring
Change the IPM module
Replace the compressor
UVW
P(-)
P(+)
UVW
Service Diagnosis
UVW
P(-)
Domestic Air Conditioner
or
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