53
Troubleshooting
Diagram 11:
The unit operating normal
before the fault been found
Check the indoor and outdoor
unit connection status by
control circuit diagram
Check the connection wire from
electrical box of the indoor and
outdoor unit is fasten.
Back to normal
connection?
Check the connecting cables
connected to the indoor and
outdoor unit properly by the
wiring diagram
Internal connecting
wire from electrical
box is normal.
Check the connecting cables
connected to the indoor and
outdoor unit properly by the
wiring diagram
Check the outdoor unit
communication circuit (See
the Troubleshooting Method)
Fault declared
?
Fault declared
?
Fault declared
?
Problem with the
communication circuit
Change the indoor unit
main board
Change the outdoor unit
main board
(
AP1
)
End
Start
Main check points:
● Test the indoor and outdoor unit connection wire and internal wiring is connected or in good condition.
●
Check the indoor unit main board communication circuit and outdoor unit main board communication circuit (AP1)are in good condition.