Samsung AC026MN1DKH/EU - Indoor Unit Float Sensor Error (E153)

Samsung Electronics 4-31
Indoor unit display
4way
X (Operation) X (Defrost) (Timer) (Filter)
1way
X (Operation) X (Defrost) X (Reservation) (Fan) (Filter)
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.
4-4-5 Indoor unit float sensor error (E153)
No
No
No
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
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
Error occurs
Float sensor error is released when
indoor unit power is reset.
Use AC drain pump.
Which one of AC drain pump
and DC drain pump is used?
DC drain pump PCB unit
(CN76) voltage = around DC 12V ?
DC AC drain pump
PCB unit(CN74)
voltage = around AC 12V ?
Replac AC drain pump
Replace indoor unit PBA
Replac DC drain pump
Use DC drain pump.
Replace indoor unit PBA
Yes
Yes
No