Daikin RTSQ20PY1 Service Manual page 260

Troubleshooting by Indication on the Remote Controller
Troubleshooting
Power ON
Power ON
249
Be sure to turn off power switch before connect or disconnect connector,
Caution
or parts damage may be occurred.
While in monitor mode,
check the outdoor unit and
the function unit concerned.
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
Power OFF
correct.
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 the power
transistor check mode ON using "Setting
mode 2" of the outdoor unit PCB.
Measure the inverter output voltage (*2).
Power OFF 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
(Check it shutting the power supply off.)
NO
YES
NO
YES
NO
YES
YES
NO
YES
NO
NO
YES
YES
NO
NO
YES
SiBE31-801_C
Local factor
Open the stop valve.
Replace the connecting wires and
ensure right connection of the
connector.
Ensure correct connection.
W
U
V
Replace the compressor (M1C).
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 PCB (A3P).
Replace the inverter compressor.
CHECK 4 (P.341).
Troubleshooting