Haier HSU12 - IPM Protection

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Domestic Air Conditioner
7.3.3 IPM protection
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outdoor display LED1 flash 2 times: Indoor Display F1
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Method of IPM protection is detected by checking the compressor running condition and so on.
Malfunction
Detection
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Malfunction
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The system leads to IPM protection due to over current
Decision
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The compressor faulty leads to IPM protection
Conditions
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circuit component of IPM is broken and led to IPM protection
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Supposed
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IPM protection dues to the compressor faulty
Causes
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IPM protection dues to faulty PCB of IPM module
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Compressor wiring disconnected
Troubleshooting
* Caution Be sure to turn off power switch before connect or disconnect connector, or
else parts damage may be occurred.
Check the IPM module method:
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 digital
tester)
P(+) UVW P(-) UVW
P(+)terminal of tester(N(-)for digital UVW P(+) UVW P(-)
Turn off the power.check if
the compressor wiring
NO
Check the IPM module
Yes
Normal
Yes
NO
Test the resistance values among
Phases U
,
V and W of com
p
ressor
If the resistance
are equal and less
NO
Yes
Check the installation condition .
Change the IPM module
Renewedly connect the wiring
Replace the compressor
HSU12/18VHJ(DB)
Functions and control
59