Daikin FCQ18PVJU Service Manual page 114

Troubleshooting by Indication on the Remote Controller
Troubleshooting
107
Be sure to turn off the power switch before connecting or disconnecting
Caution
the connector, or parts could be damaged.
Check the installation
conditions.
NO
Is the stop valve open?
YES
NO
Is the UVW wiring
normal?
YES
Is high
YES
differential pressure starting?
(72psi or more)
NO
Check and see
YES
whether compressor is
short-circuited or
grounded.
NO
Are inverter
NO
output voltages the same
for 3 phases?
YES
Does low or
high pressure vary
YES
even instantaneously when
restarting
compressor?
NO
SiUS28-902_a
Open the stop valve.
Connect correctly.
Remedy the cause.
Replace the compressor.
Replace the inverter P.C.B.
(A1P).
Replace the compressor.
Troubleshooting