Samsung IDH1800E Service Manual page 85

Trouble Shooting
EC05 : When the trouble is found in the communication related part between indoor unit
and outdoor unit.
- EA of 7-segment of outdoor unit PCB.
- Reservation lamp and filter lamp of wireless receiving board is flickering with 1 Hz.
- Action item when "*A" displays on the wired remote controller.
Check point :
↔ outdoor unit mis-connection
- Indoor unit
- Indoor unit PCB defect
- Outdoor unit PCB defect
Are the terminals N1,L1,C of indoor unit and outdoor unit
are correctly connected? and is the set power on?
YES
Is the LED of PCB flickering with 16Hz for 250ms and
then repeating the on?
NO
Is the LED of PCB flickering with 16Hz?
NO
Replace the PCB
"*" stands for the indoor unit address.
6-6
NO
Do connection correctly and check.
YES
Indoor unit communication norma
The Micom of outdoor unit is operating normally,
YES
check and replace the communication circuit of
outdoor unit and indoor unit.
Samsung Electronics