Samsung Electronics
4-17
Indoor unit display
Symptom
The indoor unit floating sensor is open and that state is maintained for more than one minute
Failure
Increase in the drain pan water level due to failure of the indoor unit drain pump,
or float sensor failure
4-3-5 Indoor unit float sensor error
No
No
No
No
No
Yes
Yes
Yes
Yes
Yes
Yes
Remove the floating sensor
connector connected to the indoor unit
PCB and the resistance measured between the
two terminals. Is the resistance ∞?
(open circuit)
Is the water level in the drain pan high?
Does drain pump operate
when compressor operates?
Same error occurs again
No
Drain pump PCB
Is the terminal voltage around
AC 220V?
Is the water level in
drain pan decreasing?
Reset the indoor unit power and
check the operation of the drain pump.
(it vibrates when operating)
Normal operation
Replace the indoor unit PCB
Reassemble the floating sensor
connector and reset the outdoor unit
power. (Indoor unit power reset is
required)
Normal operation
Replace the floating sensor
when it fails and reset the
indoor unit power
Replace the drain pump
Replace the drain pump
Replace the indoor unit PCB
Error occurs
• Float sensor error is cleared only
when the indoor power is reset
