Carrier 42LUVH045N - Page 40

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9.2.9 P2(temperature protection of compressor top) diagnosis and solution.
9.2.10 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
0.71ohm?
YES
Replace inverter
compressor
Reconnect and retry
NO
NO
NO
Is abnormality
the same after
gas charging?
NO
Is refrigerant
circulation
volume normal?
YES
Charge refrigerant
Does
compressor
operate?
Check refrigerant system
(such as clogging of
capillary, etc)
Replace the outdoor
PCB.
YES
Check the outdoor
main PCB. Is there
some problem?
YES
Is protector
normal?
YES
NO
Replace the protector.
NO
Reconnect and retest.
NO
Is the
connection
good?