Service Manual

Troubleshooting SiUS091133
133 Service Diagnosis
Troubleshooting
Check No.15
Refer to P.146
Check No.21
Refer to P.152
(R15326)
Caution
YES
2 sec
Time
NO
NO
YES
YES
NO
YES
NO
YES
NO
Current
(guideline)
Turn off the power and turn it on
again.
Start operation.
Check No. 21
Check the capacitor voltage.
Measure the rectifier input voltage.
Turn off the power. Disconnect the
harnesses U, V, and W.
Check No. 15
Check with the inverter checker (∗).
Turn off the power and reconnect
the harnesses. Then turn on the
power again and restart operation.
Replace the outdoor unit
PCB.
Replace the outdoor unit
PCB.
Replace the outdoor unit
PCB.
Check the supply voltage.
Replace the compressor.
Capacitor charged when
the indoor unit or outdoor
unit main relay turns on
Rising with increasing
frequency
Correct the power supply or
replace the outdoor unit PCB.
∗ Inverter checker
Part No.: 1225477
Be sure to turn off the power switch before connecting or disconnecting
connectors, or parts may be damaged.
∗ Running current
as shown at right
with relay cable 1
or 2?
320 ± 50 VDC?
Any LED OFF?
Compressor running?
Voltage within the
allowable range
(Supply voltage ±
15%)?