Technical Information
ƴƶ
YES
NO
4. Diagnosis for failure start up malfunction (AP1 below is control board of outdoor unit)
Main detection point:
• Is the compressor wiring correct?
• Is the stop time of compressor enough?
• Is the compressor damaged?
• Is the refrigerant charging too much?
Malfunction diagnosis process:
Power on the unit
Is stop time of the compressor
longer than 3 minutes?
Is the compressor wire
COMP(UVW) is well connected
and connection sequence
correct?
Is the refrigerant charging
too much?
Charge the refrigerant
according to service manual
Does the unit start up
normally?
Replace the compressor
End
YES
YES
YES
NO
If the stop time is not enough
and the high and low pressure of
system is not balanced, start it
after 3 minutes
Improve the connection of control
board AP1 and compressor COMP,
connect it with wiring diagram
NO
NO
Does the unit start up normally?
Replace control board AP1
Has malfunction been removed?
NO
