Error code N

Last updated: August 10, 2026
Applicable model: Popur S7 Split Litter System (SLS)
Applicable firmware version: 4.0.0 & onwards
Applicable mobile app version: 2.0.0 & onwards (both Android & iOS)

🔍 Troubleshooting Suggestions

Error code N indicates that the cat sensor is not picking up cat movements consistently. It is determined because the sifter movements are not detected during self-check. Therefore, please ensure the sifter is already installed.

Firstly, we recommend making the sensor easier to trigger by increasing the sensitivity and range in the Popur S7 App → Device Page → Top-right icon for Settings → Detect.

Please ensure your unit is in the default Automatic mode (indicated by purple light) as opposed to green or blue color for manual operation.

Usually, the system can be recovered or at least temporarily restored through a hard reset, which will erase all customizations, clear cache, and reset all settings to default values. Simply hold the Clean (aka Play) button for 7 seconds until you hear three consecutive beeps.

After the reset, please conduct a quick sensor test by gently waving your hand above the litter bed to simulate a cat's movement. Please continue the motion for at least 10 seconds to ensure a sustained trigger. Under normal operation, the purple status light will:

Blink to indicate motion detection;
Spin once a while (about 6 seconds) to confirm the trigger;
Switch to a breathing pattern, signaling that a cleaning cycle is scheduled.

If the purple light still doesn't blink, a new cat sensor will be needed.

🪛 Repair or Replacement

We recommend replacing the cat sensor to permanently resolve the issue if this error code appears. Feel free to keep the motherboard as backup and skip the corresponding section in the video, as it is not applicable to the present issue.

For the replacement parts:

Please contact our Customer Care Department if your unit is under warranty.
If out of policy, kindly refer to the corresponding parts listed in our store: Motherboard & Cat Sensor for Popur S7.
Video guide: https://youtu.be/x5ucrnZZ5dQ.

Warm reminder: If you don't hear from us within 48 hours, it suggests that your email provider has spammed or blocked our reply. Please add our domain (@popur.com) to your approved senders list or check the junk folder. You may go ahead purchase the above parts first to save shipping time, and ask for a refund retrospectively. Please note this type of refund can only be issued via non-expiring store credit as a warranty arrangement.