7.3.3 IPM protection
LED1 flash 2 times: Indoor Display F1
IPM protection is detected by checking the compressor running condition and so on.
* Caution Be sure to turn off power switch before connect or disconnect connector, or
Turn off the power.check if
Check the IPM module
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
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.
Check the IPM module method:
Renewedly connect the wiring
Change the IPM module
Replace the compressor
Several kΩ to several MΩ ( )
Short (0 Ω) or open
Domestic Air Conditioner