Daikin VRV III REYQ8PY1 Service Manual page 267

Troubleshooting by Indication on the Remote Controller
Troubleshooting
256
Be sure to turn off power switch before connect or disconnect connector,
Caution or parts damage may be occurred.
Check if
the stop valve is
open.
Check if
the relay wires to the
compressor are
correct.
Check if the
connection of UVW
phase order is
correct.
Power OFF
Check if
the wiring is the
same as in the electric
wiring diagram.
The insulation
resistance of the compressor
is low (not more than
100kΩ).
The compressor
coil has disconnection
of wires.
Restart and
check the operation.
Check if the condition
occurs again.
Check if
the start mode is in
the high differential pressure
(not less than
0.5 MPa).
Remove the connection between
the compressor and inverter. Set
Power ON
the power transistor check mode
ON using "Setting mode 2" of the
outdoor unit PC board.
Measure the inverter output voltage
(∗2).
Note: Measurement should be made
while the frequency is stable.
Check
if the inverter
output voltage between 3
phases is within
± 5V.
∗1: Pressure difference between high pressure and low pressure before starting.
∗2: The quality of power transistors/ diode modules can be judged by executing
NO
YES
NO
YES
NO
YES
NO
Check if the wiring has
any error in mistake for
YES
inverter compressor.
YES
NO
YES
NO
NO
YES
YES
NO
NO
YES
Si37-701
Local factor
Open the stop valve.
Replace the connecting wires and
ensure right connection of the
connector.
Ensure correct connection.
W
U
V
Ensure correct connection.
Replace the compressor.
Conclude the work
There is a possibility of defect
of pressure equalizing.
Check the refrigerant circuit.
Defect of pressure equalizing
Check the refrigerant circuit.
Replace the inverter PC board.
Replace the inverter compressor.
Check 4 (P349).
Troubleshooting