Midea MSY-09HRDN1-QC8 - Page 41

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9.2.8 P1(over voltage or too low voltage protection) diagnosis and solution.
9.2.9 P2(temperature protection of compressor top) diagnosis and solution.
9.2.10 P4(inverter compressor drive error) diagnosis and solution.
Is all connectio
ns on PCB
and between PCB and
compressor good?
Repair or correct the
connector or connection.
Replace the outdoor
PCB and then repower
on. Is the failure
cleared?
NO
YES
Check the compressor
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
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