23
Indoor unit display
LED STATUS
E2
Zero-crossing examination error
Indoor unit display
LED STATUS
E3
Fan speed beyond control
Is
power
supply
and
connection
of
connectors
good?
Indoor PCB is defective. Replace
the indoor PCB.
Be sure the power supply is good
and correct the connection
NO
YES
Disconnect the power supply, after 1 minute, connect
the power supply , turn on the unit with remote
controller
Does the unit work normally ?
Check the wiring between
indoor and outdoor unit. Is the
connection of L, N, S and GND
good?
Is the GND connection on
outdoor PCB good?
NO
NO
Reconnect and retest again
Is the LED4(red) on outdoor
PCB
bright
and
LED1(yellow) blinking?
Replace outdoor e-box.
Yes
Yes
The power supply for outdoor
PCB is fail. Check the wiring
on outdoor PCB comparing
with wiring plate. Is the
connection good?
No
Correct the connection.
Yes
No
Replace indoor PCB
and repower on. Is the
failure cleared?
