Daikin FTKS20D2VMWL, Service Manual

Page: 149 / 228

Troubleshooting SiENBE04-507A
140 Service Diagnosis
Troubleshooting
Check No.7
Refer to P.147
Check No.8
Refer to P.147
Check No.13
Refer to P.149
Note:
If the model doesn’t have SPM, replace the outdoor unit PCB.
Fully open the stop valve.
Keep on using as it is
(monitor).
Check the electricals'
connectors and other
fittings.
∗
Inverter checker
Part No.: 1225477
Correct the power supply or
replace the SPM.
(Replace the outdoor unit
PCB.)
Replace the SPM.
(Replace the outdoor unit
PCB.)
Correct the power supply.
Replace the compressor.
(R2852)
Be sure to turn off power switch before connect or disconnect connector,
or parts damage may be occurred.
Stop valve fully open?
Error again?
Voltage as rated?
Normal?
Any LED off?
Turn off the power and turn it on
again to get the system started.
See if the same error occurs.
Turn off the power and disconnect
the harnesses U, V and W.
Check with the inverter checker (
∗
).
Turn off the power, and reconnect
the harnesses. Turn on the power
again and get restarted.
Check the supply voltage.
Check No. 13
Check the power transistor.
Check No. 8
Check the discharge pressure.
Check No. 7
Check the installation condition.
Caution
∗
An output over-current may result from wrong internal wiring. If the wires have been disconnected and
reconnected for part replacement, for example, and the system is interrupted by an output over-current,
take the following procedure.
Short-circuit
or breakage between
compressor's coil
phases?
Monitor the supply voltage,
discharge and suction pressures,
and other factors for a long term.
Possible causes
Instantaneous supply voltage
drop
Compressor motor overloaded
Contact-induced electrical
short-circuit
NO
YES
NO
NO
YES
YES
NO
NO
YES
YES
NO
YES