Samsung ACH1800E Technical Manual page 154

Fault Diagnosis by Symptom
G 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.
TROUBLE SHOOTING & ERROR MODE
(Cont.)
NO
Connect correctly and check.
NO
Connect correctly and check again
NO
Set address to "0"
NO
Replace the wired remote controller
7
SAMSUNG | 153