Daikin CTXU25G2V1B Service Manual page 164

Troubleshooting
Troubleshooting
* Output overcurrent may caused by improper wiring inside the unit. If the unit
Check No.03
Refer to P.170
Check No.14
Refer to P.173
Check No.15
Refer to P.174
Check No.16
Refer to P.175
153
Be sure to turn off power switch before connect or disconnect connector,
Caution or parts damage may be occurred.
stops due to output overcurrent after connecting or disconnecting wires to
replace part, check wiring for proper connection.
Is the stop valve
fully opened?
YES
Check that the fault condition
appears whenever turning on the
power supply again after turning it
off.
Repeated?
YES
Turn off the power supply, and
disconnect U, V, and W
harnesses
Check No.14
Check the inverter by the
inverter checker*
Is LED turned off?
NO
Check No.15
Check the power transistor
Is it OK?
YES
Turn off the power supply, replace
the harnesses, and restart the
compressor after turning on the
power supply again.
Check the supply voltage
Rated voltage?
YES
Short-circuit or
breakage between
compressor's coil
phases?
NO
Check No.16
Discharge pressure check
Check No.03
Installation condition check
NO
Monitor the supply voltage,
discharge and suction
pressures, and other factors for
a long term.
NO
Possible causes
· Momentary supply voltage drop
· Compressor motor overloaded
· Short circuit
YES
NO
NO
YES
SiBE12-908
Open the stop valve fully.
Keep on using as it is.
}
(monitoring)
Check connectors and
other fittings of electric
components.
* Inverter checker
Part No.: 1225477
Rectify the power supply
or replace the outdoor
unit PCB.
Replace the outdoor unit
PCB.
Rectify the power supply.
Replace the compressor.
(R9449)
Service Diagnosis