Gree GWH12MB-K3DNE3G Service Manual page 49

9.Start-up failure (LC) (AP1 below means control board of outdoor unit)
Main detection points:
● If the compressor wiring is correct?
● If the stop time of compressor is sufficient?
● If the compressor is damaged?
● If the refrigerant charging amount is too much?
COMP(UVW) is well connected and
connection sequence is correct?
46
Turn on the unit
If the stop time of compressor
is more than 3min?
If the compressor wire
If the refrigerant charging
amount is too much?
Charge the refrigerant
according to service
manual
Does the unit
start up normally?
Replace outdoor
mainboard AP1
Is the malfunction
eliminated?
Replace the
compressor
End
The stop time is not sufficient and
the high and low pressure of system
is not balanced , please start the unit
after 3min
Check the connection situation
of outdoor mainboard AP1 and
compressor COMP, and the
connect it according to wiring
diagram
Does the unit
start up normally?
Service Manual
Installation and Maintenance