Carrier CDII-184R1-0CTR4 - Page 55

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