Indoor Unit Float Sensor Error (E153) - Samsung AC009BNLDCH Service Manual

Troubleshooting

4-4-3. Indoor unit float sensor error (E153)

Outdoor Unit display
Wired remote Control, Wind Free RAC
Display
Duct
Blue Red
1way
Blue Yellow
X
Judgment
Refer to checking method, as shown below
method
If the increase in the drain pan water level due to failure of the indoor unit drain pump or indoor unit
Symtom
float switch is open and that state is maintained for more than one minute.
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)
Yes
Is the water level
in the drain pan high?
Yes
Reset the indoor unit power and check
the operation of the drain pump.
(Vibrates when operating)
Yes
Does drain pump operate when
compressor operates?
Yes
Is the water level in drain
pan decreasing?
Normal operation
4-58
Duct, 1way Cassette
or or
◑
X X
No
Replace the floating sensor when it
fails and reset the indoor unit power
No
No
Replace the drain pump
E153
E153
4way Cassette,
4way Cassette(600x600)
or
◑
X X
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
[DC drain pump PCB]
Is the voltage of terminal (CN802)
approximately DC12V?
Yes
Replace the DC drain pump
360 Cassette
GRN ● ↔ BLUE●
◑ ◑
No
Normal operation
Replace the indoor unit PCB
No
∙ Float sensor error is cleared only when
the indoor power is reset.
Samsung Electronics