Ipm Protection - Haier HSU-18,22HVA103/R2(DB) Service Manual

7.2.3 IPM protection

outdoor display LED1 flash 2 times:
Method of IPM protection is detected by checking the compressor running condition and so on.
Malfunction
Detection
■ The system leads to IPM protection due to over current
Malfunction
Decision ■ The compressor faulty leads to IPM protection
Conditions ■ circuit component of IPM is broken and led to IPM protection
■ IPM protection dues to the compressor faulty
Supposed
■ IPM protection dues to faulty PCB of IPM module
Causes
■ Compressor wiring disconnected
* Caution Be sure to turn off power switch before connect or disconnect connector,
Troubleshooting
Turn off the power.check if the
compressor wiring commect.
Check the IPM module
Normal
Test the resistance values among
Phases U, V and W of compressor
If the resistance are
equal and less than 3Ω
Check the
condition.
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(+)terminal of tester(N(-)for digital tester)
Normal resistance
Unacceptable resistance
7.2.4 The IPM and outdoor PCB don't communicate or Related Abnormality
LED1 flash 4 times
outdoor display
HSU-18,22HVA103/R2(DB)
else parts damage may be occurred.
NO
Yes
NO
?
Yes
NO
Yes
installation
Renewedly connect the wiring
Change the IPM module
Replace the compressor
P(+) UVW
UVW P(+)
Several kΩ to several MΩ (∗)
Short (0 Ω) or open
79
Service Diagnosis
P(-) UVW
UVW P(-)
Domestic Air Conditioner
or