Service Manual

Troubleshooting SiUS041638E
83 Service Diagnosis
Troubleshooting
Check No.15
Refer to P.96
Check No.18
Refer to P.99
Check No.20
Refer to P.100
Caution
Be sure to turn off the power switch before connecting or disconnecting
connectors, or parts may be damaged.
NO
YES
Turn off the power.
Check the connection.
Check the power supply voltage.
Correct the power supply.
Voltage as rated?
(R21864)
NO
NO
NO
NO
YES
YES
YES
YES
Check No. 20
Check the short circuit of the diode
bridge.
Check No.15
Check with the inverter analyzer.
Turn off the power. Disconnect the
harnesses U, V, and W.
Turn on the power. Check the
electrolytic capacitor voltage.
Electrical
components or
compressor harnesses
connected as
specified?
Replace the outdoor unit
PCB (main PCB).
Correct the power supply or
replace the outdoor unit
PCB (main PCB).
Replace the compressor.
Reconnect the electrical
components or compressor
harnesses as specified.
Replace the outdoor unit
PCB (main PCB).
∗ Inverter analyzer:
RSUK0917C
Normal?
NO
YES
Check No. 18
Check the discharge pressure.
Replace the stop valve.
OK?
320 VDC?
Any LED OFF?
+ 100
- 50