Daikin FTX20K(2)V1B Service Manual page 83

SiBE041525F
Troubleshooting
Check No.15
Refer to P.83
Check No.18
Refer to P.86
Check No.20
Refer to P.87
Service Diagnosis
Be sure to turn off the power switch before connecting or disconnecting
Caution connectors, or parts may be damaged.
Turn off the power.
Check the power supply voltage.
Is the
power supply
voltage fluctuation within
±10% from the rated
value?
YES
Check No. 18
Check the discharge pressure.
OK?
YES
Check No. 20
Check the short circuit of the diode
bridge.
Normal?
YES
Check the connection.
Electrical
components or
compressor harnesses
connected as
specified?
YES
Turn on the power. Check the
electrolytic capacitor voltage.
+ 100
Within 320 VDC?
– 50
YES
Turn off the power. Disconnect the
harnesses U, V, and W.
Check No.15
Check with the inverter analyzer.
Any LED Off?
YES
NO
NO
NO
NO
NO
∗ Inverter analyzer:
RSUK0917C
NO
Troubleshooting
Correct the power supply.
Replace the stop valve.
Replace the outdoor unit
PCB (main PCB).
Reconnect the electrical
components or compressor
harnesses as specified.
Replace the outdoor unit
PCB (main PCB).
Replace the compressor.
Correct the power supply or
replace the outdoor unit
PCB (main PCB).
(R22764)
72