Carrier 38LUVH065N-1 - Page 36

PART7, 3
2.2 Indoor unit and outdoor unit communication protection error diagnosis and solution
No
Yes
Yes
No
Yes
The unit does not work normally
Check the wiring between indoor unit and outdoor
unit. Is the connection of L, N, S and GND good?
No
Is the LED4(red) bright and LED1(yellow)
blinking on outdoor PCB?
The power supply for outdoor PCB is fail.
Check the wiring on outdoor PCB
comparing with wiring plate. Is the
connection good?
The unit does not
work normally
Turn off the power supply, after 1 minute, connect the
power supply, turn on the unit with remote controller
Replace indoor unit PCB
and repower
Replace outdoor e-box.
Correct the connection
Reconnect and retest
Replace the outdoor unit e-box