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7.3.3 IPM protection
outdoor display
LED1 flash 2 times: Indoor Display F1
Method of
IPM protection is detected by checking the compressor running condition and so on.
Malfunction
Detection
Malfunction
Decision
Conditions
Supposed
Causes
Troubleshooting
* Caution Be sure to turn off power switch before connect or disconnect connector,
Turn off the power.check if
the
compressor
Check the IPM module
Normal
Test the resistance values among
Phases U, V and W of compressor
If the resistance
are equal and less
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(+)terminal
of
tester)
HSU24VHJ DB
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
else parts damage may be occurred.
wiring
Yes
NO
Yes
Yes
.
Check the IPM module method:
tester(P(+)for
digital
tester(N(-)for
digital
NO
Renewedly connect the wiring
Change the IPM module
NO
Replace the compressor
P(+)
UVW
UVW
P(+)
55
Service Diagnosis
P(-)
UVW
UVW
P(-)
Domestic Air Conditioner
or
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