B
Troubleshooting
5-4
Coway co., Ltd
Yes
No
Check the water level sensor
and replace it if necessary.
Is the water level
sensor normal?
When the water reaches the
top of the sensing part of the
low/mid water level sensor
or the water reaches the
bottom of the sensing part
of the full water level/water
overflow sensor,
the output voltage should be
0 Volt. Otherwise it should be
5 Volt.
No
Check the Main PBA and
replace it if necessary.
Are the voltages of the
valve and pump connector of the
main PBA normal?
The Feed/NOS valve
under normal conditions:
DC 24 / 0 Volts
Pump: AC 24 Volts
No
Yes
Check and replace it if
necessary.
Is the Feed-NOS
valve defective?
Check the back of the valve
under normal water filtration
conditions. (Check if there are
any foreign objects).
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