Samsung ACH1800E Technical Manual page 152

Fault Diagnosis by Symptom
G EC04 : When the trouble is found on the drain pump and float switch installed on the indoor unit.
EC01 : Trouble on the thermistor related part of indoor unit.
- E9 of 7-segment of outdoor unit PCB
- Reservation lamp of wireless receiving board and filter lamp are flickering with 1 Hz.
- Action item when "*9" displays on the wireless remote controller.
Check point :
- Indoor unit defect
- Drain pump, float switch defect
Start
YES
Is available drain
pump?
NO
NO
SW2 ON? Replace PCB
YES
SET SW2 OFF
SET SW3 OFF
Power RESET
✽ "*" stands for the indoor unit address.
(Cont.)
YES
Is available float
SW2 ON?
SW?
Install float SW
SET SW2 OFF
SET SW3 OFF
TROUBLE SHOOTING & ERROR MODE
Check the
YES YES
SW3 ON?
indoor unit
SAMSUNG | 151
7
float SW
Replace
PCB