Samsung AC018JNHDCH/AA Service Manual page 45

4-2-6 float switch(Open)
Indoor unit display
Wire remote controller display
Symptom
Failure
Is the wire connector
disconnected from the PCB?(CN411)
Remove the wire connector from the PCB
and measure the resistance between two
Is the resistance 0Ω ?
Replace the PCB and restart the unit
4-10
X (Operation) X (Defrost)
E153
2nd Detection of the float switch
Float switch open
No
terminals
Yes
X (Timer) (Fan) (Filter)
Yes
Connect the connector to PCB
No
Replace the float switch and
restart the unit
restart the unit
Samsung Electronics