Samsung ACH2400C Service Manual page 27

Trouble Shooting
EC06 : When the trouble is found in the communication related part between indoor unit
and wired remote controller. (during single operation, not group control)
- EC of 7-segment of outdoor unit PCB.
- Wireless receiving board lamp and reservation lamp is flickering with 1Hz.
- Action item when "C" displays on the wired remote controller.
Check point :
- Short circuit or mis-connection of the communication line between indoor unit and wireless remote controller
- Indoor unit PCB defect
- Wired remote controller PCB defect
Are the terminals R1, R2, R3 of indoor unit terminal
board connected correctly to R1, R2, R3 of wired remote
controller?
YES
Is 7P(RED) of transformer connected to CN11
of indoor unit?
Is the jump wire inserted into CN20 of indoor unit PCB?
YES
Is the address of PCB digital switch of indoor unit to "0"?
YES
Replace the indoor unit PCB
"0" stands for the indoor unit address.
26
NO
NO
Connect correctly and check again
NO
NO
Replace the wired remote controller
Connect correctly and check.
Set address to "0"