Midea MSC-09HRDN1-QD0(E) - Page 41

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10.3.8 P1(over voltage or too low voltage protection) diagnosis and solution.
10.3.9 P2(temperature protection of compressor top) diagnosis and solution.
10.3.10 P4(inverter compressor drive error) diagnosis and solution.
Is the connection of
compressor good? Is the
wiring sequence right? The
voltage range proper?
Replace the outdoor E-box.
If the problem comes to
again, check coil resistance
of inverter compressor, is it
0.
71
ohm?
YES
Replace inverter compressor
Reconnect and retry
NO
NO
Is the power supply good?
Be sure the power supply is
normal when using the units
NO
YES
Replace the outdoor e-box.
YES
Does compressor
operate?
Is the connection
good?
Is refrigerant
circulation
volume normal?
NO
NO
Charge refrigerant
Is abnormality
the same after
gas charging?
NO
Check refrigerant system (such
as clogging of capillary, etc)
Reconnect and retest.
NO
YES
Is protector
normal?
Replace the protector.
NO
YES
Check the outdoor
main PCB. Is there
some problem?
Replace the outdoor PCB.
YES