Kohler KARING 2.0 K-77780TW-0 Homeowner's Manual page 41

B. Water purification cartridge exchange
Please exchange filter cartridge immediately when customer found red
light ON all the time as following:
1.Open toilet cover.
Open toilet cover by tool (provided), remove cover from the top.
2.Unscrew air filter cartridge as shown direction.
3.Slightly press down and unscrew as shown direction, tighten new filter cartridge.
4.System auto release alarm, return to normal usage status.
5.Close toilet cover again
Snap toilet cover downward manually, no loose snap-fit on both
sides and rear end to complete installation.
Note: i. No power failure during cartridge exchange, otherwise the system shall
not be able to release alarm.
ii. Change cartridge when power is OFF, release alarm by re-plug cartridge after power is on.
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