Gree GWH18AC-D3DNA1B Service Manual page 52

9.2.3.4 Diagnosis of failure startup (outdoor unit malfunction)
Indoor display: LC (dual-8 display), heating indicator is off for 3S and blinks 11 times.
Main detection point:
Is the compressor wiring correct?
Is the off time of compressor enough?
Is the compressor damaged?
Is the refrigerant charging too much?
Malfunction diagnosis process:
Energize the unit
and start it
If the stop time of compressor is
more than 3min?
Y
If the compressor wire COMP(UVW) is
well connected and connection sequence
is correct
Y
If the refrigerant charging is
too much?
Y
Charge the
refrigerant with
service manual
Does the unit start
up normally?
N
Replace control board AP1
If malfunction is
removed?
N
Replace the
compressor
Finish
If the stop time is not enough and the
N high and low pressure of system is not
balance , please start it after 3min
Improve the connection situation
of control board AP1 and
N
compressor COMP, connect it
with wiring diagram
Does the unit start
up normally?
N
Y
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Troubleshooting