Troubleshooting
4-30
4-4-6. Indoor unit float sensor error
Indoor unit display
360 Cassette
x(Ice blue)
◑
(Yellow green)
◑
(Blue) x(Red)
Judgment method
Refer to checking method, as shown below
Symptom
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
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.
(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
䭓
Float sensor error is cleared only when the indoor power is reset.
䭓
Duct model and 1-way cassette model use AC drain pump.
(DC drain pump uses only the some 4-way cassette models.)
CAUTION
[DC drain pump PCB]
Is the voltage of terminal (CN802)
approximately DC12V?
Replace the DC drain pump
Replace the indoor
unit PCB
Yes
No
