30
4. Start- up failure (LC) (AP1 below means control board of the outdoor unit.
Main detection points:
S Is the compressor wiring correct?
S Is the compressor stop time sufficient?
S Is the compressor damaged?
S Is the unit overcharged?
Does the unit turn on
within 3min?
Is the charge in the system correct and
have you opened both liquid and
suction valves? Does the unit start?
Is the compressor
wired correctly?
Check the connection
of outdoor mainboard AP1 and
compressor, and then
connect it according to wiring
diagram
Is the unit over charged?
Does the unit
start up normally?
Charge the refrigerant
according to unit
nameplate
Does the unit
start up normally?
Replace outdoor
mainboard AP1
Is the malfunction
eliminated?
Replace the
compressor
End
Turn on the unit
Yes
Yes
Yes
Yes
Yes
No
No
No
No
No
Fig. 33 – Troubleshooting
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