when indoor unit displays p0p for that
indicates IPM module fault or IGBT over voltage protection malfunction decision
conditions p0 when the voltage signal that IPM sends to compressor drive chip is
abnormal the display LED will show p0 and the air conditioner will turn off malfunction
decision conditions p4 an abnormal inverter compressor drive is detected by a special
detection circuit including communication signal detection voltage detection compressor
rotation speed signal detection and so on the failure could be caused by one wiring mistakes
– IPM error 3 outdoor fan motor error for compressor error 5 out to our main PCB error 6
system pressure error 7 heat dissipation error check the wiring between the main PCB and
the compressor if the wiring is correct check if IPM is operating well check the
resistance value between P and you V W the normal value should be as megohm order
of magnitude and each two values are equal check the resistance between N and
you V W the normal value should be as megohm order of magnitude
and each two values are equal if the result is not replace the IPM board
or replace the main PCB check if ventilation of the outdoor unit goes well check if
the outdoor fan operates well then find solutions according to the solution for
the malfunction of fan motors being out of control check the resistance value of the
compressor terminal and check if the compressor is working well the normal resistance
value of each two terminals are equal if the resistance are not equal
replace the compressor if the error still exists replace the outdoor main PCB
