Indoor Unit Float Sensor Error - Samsung AC012MNADCH/AA Service Manual

4-3-5 Indoor unit float sensor error

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