Daikin FTXN25KEV1B Service Manual page 92

Troubleshooting
Troubleshooting
Check No.15
Refer to P.91
Check No.17
Refer to P.92
Check No.18
Refer to P.93
Check No.22
Refer to P.94
82
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 and turn it on
again to start 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 checker (∗).
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.
Voltage as rated?
YES
Short circuit or
wire breakage between
compressor's coil
phases?
NO
Check No. 18
Check the discharge pressure.
NO
NO
Monitor the power supply voltage,
discharge and suction pressures,
and other factors for a long term.
Possible causes
∗
Momentary fall of power supply
voltage
∗
Compressor overload
∗
Short circuit
∗ Inverter checker
Part No.: 1225477
YES
NO
NO
YES
SiBE041102_A
Fully open the stop valve.
Keep on using as it is.
Check the connectors and
other components.
Correct the power supply or
replace the outdoor unit
PCB.
Replace the outdoor unit
PCB.
Correct the power supply.
Replace the compressor.
(R14446)
Service Diagnosis