Coway P-220R - Sensor detection and failure indications

Troubleshooting
Coway co., Ltd
5-11
Function Detailed operation
2.
W
ater level
and valve
control
Low
water
level
sensor
Full
water
level
sensor
Overflow
sensor
Operation Indicator
Feed
valve
NOS
valve
Non-
detection
0
⇓
Detection
1
⇑
Non-
detection
0
⇓
A low water level
sensor defect
A water level sensor
defect
If this condition is
released, the product
works properly.
The LED blinks
once (at 200
ms intervals)
& the beeper
sound plays
(ding~)
OFF OFF
Detection
1
⇑
SHORT
1
⇑
Detection
1
⇑
A feed valve defect
The error is indicated
when this occurs 3
times
(However, if this
occurs once or twice,
only the Nos-Feed
valve works without an
error indication.)
The LED blinks
2 times (at 200
ms intervals)
& the beeper
sound plays
(ding ding ~)
OFF ON
Detection
1
⇑
Non-
detection
0
⇓
Detection
1
⇑
A water level sensor
defect
This is indicated when
this occurs three times
in succession
(However, if this
occurs once or twice,
only the Nos-Feed
valve works without an
error indication. The
indicator represents
the water level as full.)
The LED blinks
3 times (at 200
ms intervals)
& the beeper
sound plays
(ding ding
ding~)
OFF ON
Non-
detection
0
⇓
Non-
detection
0
⇓
Detection
1
⇑

Sensor detection indication: [1, ⇑ ]
Sensor detection failure indication: [0, ⇓
]

If a water overflow is detected, the Nos valve is unconditionally turned on to cut
the water supply.