LG CordZero R5TCheck FilterCheck Filter — cause and how to fix it
Error code: Check Filter
The 'Check Filter' alert persists even after cleaning if the pressure sensor inside the bin is clogged.
How to fix CordZero R5T Check Filter
- 1
Use compressed air to blow out the internal suction path and replace the HEPA filter.
- 2
If the sensor is faulty, internal filter housing parts are available online for around $15-20.
What this repair uses
LG CordZero R5T filter kit
Take it out, clean it, and seat it again before you replace it. If the error stays, this is the part to change.
Frequently asked questions
What does LG CordZero R5T Check Filter mean?
The 'Check Filter' alert persists even after cleaning if the pressure sensor inside the bin is clogged.
Is this a hard repair to do myself?
Most of the steps above take 20-40 minutes with basic tools like a screwdriver. If you'd rather not open the unit yourself, contact the official support line below instead.
What part do I need?
You'll need a LG CordZero R5T filter kit. Compatible aftermarket parts are widely available on AliExpress and typically cost $8-60 depending on the part.
How do I contact LG support?
LG has 400+ service centers across Korea. Book via the LG ThinQ app for door-to-door repair service without an appointment. Phone: 1544-7777
Official support
LG has 400+ service centers across Korea. Book via the LG ThinQ app for door-to-door repair service without an appointment.
Online support
Open support page →