Carrier 42LUVH055N Service Manual page 37

9.2.9 P2(temperature protection of compressor top) diagnosis and solution.
Does compressor
operate?
YES
Is refrigerant circulation
volume normal?
NO
Charge refrigerant
Is abnormality
same after
charging?
NO
9.2.10 P4(inverter compressor drive error) diagnosis and solution.
Is the connection
compressor good? Is the
wiring sequence right?
The voltage
proper?
Replace the outdoor E-box.
If the problem comes to
again,
resistance
compressor,
0.668ohm?
NO
the
gas
of
range
YES
check coil
of inverter
is it
Is the connection
good?
YES
Is protector
normal?
YES
Check the outdoor
main PCB. Is there
some problem?
YES
NO
NO
34
NO
Reconnect and retest.
NO
Replace the protector.
Replace the
PCB.
Check refrigerant
(such as
capillary, etc)
Reconnect and retry
Replace
compressor
outdoor
system
clogging of
inverter