Samsung ACH1800E Technical Manual page 164

Fault Diagnosis by Symptom
G EC16 : When the trouble is found on the part related to float switch of indoor unit.
Check point :
- Indoor unit PCB ↔ float switch connector wire, voltage level of indoor unit micom pin no. 55
- Float switch, DC5V power, indoor unit option switch
Is the wire connected correctly between indoor unit and outdoor unit?
After check of short circuit on the wire between indoor unit and connector wire of float switch,
start the cooling operation and then check compressor operation and start the test.
Is the DC5V of indoor unit normal?
YES
Are no.2 and 3 of option switch of
indoor unit on?
YES
ERROR CODE = "09"
ERROR DISPLAY = FLICKERING
YES
Is the level of micon pin no.55
"HIGH"
YES
Are no.2 and 3 of option switch of
indoor unit on?
TROUBLE SHOOTING & ERROR MODE
(Cont.)
NO
Check and replace IC02
NO
Put on and then reset the power
NO
NO
Replace indoor unit PCB
Normal
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