Carrier CDII-184R1-0CTR4 Installation & Operation Manual page 55

Fan motor connection
short/ open
Power Supply Open at
CDU pcb
Communication to indoor
Open/short/reverse
connection at CDU pcb
Communication to drive
Open/short/reverse
connection at CDU pcb
Unit
Fault on Indoor
(FCU)
Temperature
sensor
Short/Open
Indoor freeze
Blower connection
short/open
bE
bE
bd
Table - 3
On
Description corded
remote
Inlet A2
Midlet A3
Outlet A4
Ambient A1
A0
Check wire condition of motor, it
should be in proper condition.
NA Check continuity of wires with
connector on PCB using
multimeter.
Check voltage on power
connector "P2" as well as voltage
on mains using multimeter on AC
NA BE
mode.
Check harness using Multimeter
on continuity mode.
Check connection on all PCB.
CE BE
Check connector on PCBs.
bd/C Check connection on all PCB.
BD
E Check connector on PCBs.
On On
CDU PC
Check Wiring connection plus
connector of sensor on PCB.
Check Resistance value of sensor
A2 A2
with multimeter.
Check wire insulation ,it should be in
proper condition.
Check Wiring connection plus
connector of sensor on PCB.
Check Resistance value of sensor
A3 A3
with multimeter.
Check wire insulation ,it should be in
proper condition.
Check Wiring connection plus
connector of sensor on PCB.
Check Resistance value of sensor
A4 A4
with multimeter.
Check wire insulation ,it should be in
proper condition.
Check Wiring connection plus
connector of sensor on PCB.
Check Resistance value of sensor
A1 A1
with multimeter.
Check wire insulation ,it should be in
proper condition.
Check ice formation on Coils and
close the unit to melt them.
A0 A0 Check pressure of gases in the coils
and if required, clean the filters.
Check pipe sensors.
Check wire condition of motor, it
should be in proper condition.
NA
Check continuity of wires with
connector on PCB using multimeter.
55
Troubleshooting Steps