Daikin VRVII Manual page 118

Troubleshooting by Indication on the Remote Controller
Troubleshooting
Caution
Is
the stop valve
opened?
YES
Is the
UVWN wire
connection
proper?
YES
Is it a high
differential pressure
at the time of
startup? (∗1)
NO
Restart operation after
resetting operation.
The
inverter
compressor operates
normally.
YES
Disconnect the connection
between the compressor
and the inverter and turn
on power transistor check
mode setting using
"Setting Mode 2" on the
outside unit PCB.
Measure inverter output
voltage.
Note: Take measurements
while frequency is
stable.
A
Be sure to turn off the power switch before
connecting or disconnecting connectors, or parts
may be damaged.
NO
NO
YES
NO
Open the stop
valve.
Connect
properly.
Eliminate the
causes.
The hot gas
bypass valve
may not be
opened.
Check it.
Replace the
compressor.
113