SiUS281117
Troubleshooting by Remote Controller
158
Service Diagnosis
Troubleshooting
Open the stop valve.
Is the stop valve open?
NO
NO
YES
Check the installation
conditions.
Insufficient pressure
equalization.
Check refrigerant system.
Is the
difference
between high and low
pressure before startup
not more than
0.2 MPa?
Compressor inspection.
Inspect according to the
diagnosis procedure for
abnormal noises, vibration,
operating status, etc. of the
compressor.
Replace the outdoor unit
PCB.
NO
NO
Replace the compressor.
Continuity check in
the power transistor (IGBT).
Is the continuity
normal?
YES
YES
Turn the main power supply
OFF, and then disconnect the
connection between the
compressor and inverter.
YES
The
compressor is
grounded and short
circuited.
CHECK 4
Be sure to turn off the power switch before connecting or disconnecting
connectors, or parts may be damaged.
Caution
CHECK 4
