Samsung IDH1800E Service Manual page 99

Trouble Shooting
EC19 : When the centralized controller lamp is flickering. (during centralized control)
Check point :
- Defect on the address assignment for the relay equipment connected with centralized controller.
- Defect on centralized controller PCB
- Defect on the indoor unit PCB
Is the address of Transmiter installed on the indoor
unit set correct?
YES
Is the communication line of SET short circuited?
NO
Reset the power of SET and check the status of
LED1, LED2 of Transmiter
Is the LED1 on after centralized controller on and
off after centralized controller off?
YES
Is the LED2 of relay equipment PCB flickering with
the consistent interval?
YES
Replace the PCB of centralized controller
6-20
NO
Set again in order to avoid the duplicated address
YES
Check and replace the communication line
NO
Replace the PCB of relay equipmint
NO
Replace the relay equipment PCB
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