- Power-reset the appliance fully for at least 60 seconds.
- If the code is linked to setup, network, or configuration, check that the related feature was completed correctly.
- Retest once and record whether the same code returns immediately or only during a specific function.
Filter-status abnormality detected; filter may be wrapped or not installed. On the LG AS601HBB0.AWHEUS, this code relates to the air purifier and should be interpreted together with how the appliance is behaving right now.
- The air purifier displays CHECK FILTER instead of normal status information.
- The current cycle, function, or startup sequence may stop, pause, or behave differently than expected.
- The same code may return after a reset if the underlying issue is still present.
- The appliance control system detected an electronics, memory, configuration, or communication fault.
- A board, relay, connector, or software state is preventing normal operation.
- Note any recent power cuts, installation work, firmware changes, or connection attempts before the fault appeared.
- If the appliance depends on another module or paired component, check that the connection or configuration is still correct.
- Persistent electronics faults normally need service tools or replacement parts.
- Do not dismantle electronic modules or internal wiring unless you are qualified.
Arrange service if CHECK FILTER returns after a full reset or if the air purifier behaves unpredictably, because electronics faults usually need proper diagnosis.
Can CHECK FILTER clear after a reset?
Sometimes a temporary glitch clears after one full reset, but a repeated return usually means the same underlying issue is still there.
Should I keep using the appliance if it works again briefly?
Only if the code stays away and the appliance behaves normally. If the same code comes back, stop and move to service or more targeted diagnosis.