Indoor Unit Float Sensor Error - Samsung AC071MN4PKH Service Manual

Troubleshooting

4-4-6. Indoor unit float sensor error

Indoor unit display
Judgment method
Symptom
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)
Does drain pump operate when
compressor operates?
Yes
Is the water level in drain pan decreasing?
Yes
Normal operation
360 Cassette x(Ice blue) ◑(Yellow green) ◑(Blue) x(Red)
Refer to checking method, as shown below
If the increase in the drain pan water level due to failure of the indoor unit drain pump or indoor unit
float switch is open and that state is maintained for more than one minute.
No
No
No
CAUTION
Replace the drain pump
4-30
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
Replace the floating sensor when it
fails and reset the indoor unit power
[DC drain pump PCB]
Is the voltage of terminal (CN802)
approximately DC12V?
Yes
Replace the DC drain pump
Float sensor error is cleared only when the indoor power is reset.
Duct model and 1-way cassette model use AC drain pump.
(DC drain pump uses only the some 4-way cassette models.)
No
Normal operation
Replace the indoor
unit PCB
No