Carrier 42LUVH055N Service Manual page 36

9.2.7 P0(Module protection) diagnosis and solution.
Is all connections on
PCB and between PCB
and compressor good?
Replace the outdoor
PCB and then repower
on. Is
cleared?
9.2.8 P1(over voltage or too low voltage protection) diagnosis and solution.
Is the power supply
good?
YES
the failure
YES
NO
NO
NO
33
Repair or correct the
connector or connection.
Check the compressor
Be sure the power supply
is normal when using the
units
Replace the outdoor
e-box.