Haier HSU09VHJ - Page 56

HSU09VHJ˄DB˅-SM Service Diagnosis
Domestic Air Conditioner
54

Method of IPM protection is detected by checking the compressor running condition and so on.
Malfunction
Detection

Malfunction
Ƶ
The system leads to IPM protection due to over current
Decision
Ƶ
The compressor faulty leads to IPM protection
Conditions
Ƶ
circuit component of IPM is broken and led to IPM protection

Supposed
Ƶ
IPM protection dues to the compressor faulty
Causes
Ƶ
IPM protection dues to faulty PCB of IPM module
Ƶ
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
tester)
UVW P(+) UVW P(-)
Normal resistance
Several k to several M (и)
Unacceptable resistance Short (0 ) or open
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 e
q
ual and less
NO
Yes
Check the installation condition .
Change the IPM module
Renewedly connect the wiring
Replace the compressor