Samsung IDH1800E Service Manual page 89

Trouble Shooting
EC09 : When the trouble is found on the part related to the wired remote controller.
(single operation)
Chec point :
- Defect of communication line between indoor unit and wired remote controller.
- Output of indoor unit Micom
- Defect of wired remote controller PCB
- Indoor unit PCB defect
Is the wired remote
controller energized
when the power is reset?
YES
Is the on/off button command
of wired remote controller
reflected on the set?
YES
When the power is applied
again after removing the
power at the operation on,
does the previous status
display on the wired remote
controller display window?
YES
Does the error code display?
NO
Check the main PCB of
indoor unit and replace it.
6-10
NO
Is CN20 of indoor
unit main PCB
inserted?
YES
NO
Is the address
of indoor unit "0"
More than on indoor
unit mounted on the
wired remote
controller?
NO
NO
Are the terminals R1, R2, R3 of wired
remote controlled connected to the R1, R2,
R3 of indoor unit terminal boards?
YES
NO
Connect correctly the R1, R2, R3
Error correction and recheck
NO
CN20
insertion
NO
Set to "0"
YES
One unit is
installed
YES
Is the wire of CN15 to
indoor unit terminal
board shorted?
NO YES
Replace the
wiring
Check the indoor
unit PCB
Samsung Electronics