MXS Service Manual

SiUS121736EA Troubleshooting for Outdoor Unit
Service Diagnosis 200
Troubleshooting
Check No.15
Refer to P.214
Check No.18
Refer to P.216
Check No.20
Refer to P.217
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.
(R22564)
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?
Within 320 VDC?
Any LED Off?
+ 100
- 50
Is the
voltage fluctuation
within ±10% from the
rated value?