Open the stop valve.
Is the stop valve open?
NO
NO
Caution
Be sure to turn off power switch before connect or disconnect connector, or parts damage may be occurred.
YES
Check the installation conditions.
Insufficient pressure
equalization.
Check refrigerant system.
Compressor inspection.
Inspect according to the
diagnosis procedure for
abnormal noises, vibration,
operating status, etc. of the
compressor.
Replace the outdoor unit PCB
(A1P).
NO
NO
Replace the compressor.
YES
YES
Turn OFF the power supply, and then
disconnect the connection between
the compressor and inverter.
YES
CHECK 4
Is the difference
between high and low pressure
before startup not more
than 0.2MPa?
Continuity check in the power
transistor (IGBT). Is the
continuity normal?
The
compressor is grounded and
short circuited.
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