Daikin FTX20K(2)V1B Service Manual page 89

SiBE041525F
Troubleshooting
Check No.15
Refer to P.83
Check No.17
Refer to P.86
Check No.18
Refer to P.86
Check No.22
Refer to P.88
Service Diagnosis
Be sure to turn off the power switch before connecting or disconnecting
Caution connectors, or parts may be damaged.
∗ An output overcurrent may result from wrong internal wiring. If the system is interrupted by an output
overcurrent after the wires have been disconnected and reconnected for part replacement, check the
wiring again.
Check No. 17
Check the installation condition.
Stop valve fully open?
YES
Turn off the power. Then, turn on
the power to restart the system.
See if the same error occurs.
Error again?
YES
Turn off the power and disconnect
the harnesses U, V, and W.
Check No.15
Check with the inverter analyzer.
Any LED off?
NO
Check No. 22
Check the power module.
Normal?
YES
Turn off the power, and reconnect
the harnesses. Turn on the power
again and start operation.
Check the power supply voltage.
Is the
power supply
voltage fluctuation within
±10% from the rated
value?
YES
Short circuit or
wire breakage between
compressor's coil
phases?
YES
NO
NO
Monitor the power supply voltage,
discharge and suction pressures,
and other factors for a long term.
Possible causes
∗
Momentary drop of power supply
voltage
∗
Compressor overload
∗
Short circuit
∗ Inverter analyzer:
RSUK0917C
YES
NO
NO
NO
Troubleshooting
Fully open the stop valve.
Not a malfunction.
Keep observing.
Check the connectors and
other components.
Correct the power supply
or replace the outdoor unit
PCB (main PCB).
Replace the outdoor unit
PCB (main PCB).
Correct the power supply.
Check the discharge
pressure.
Go to Check No. 18.
Replace the compressor.
(R22765)
78