> For the complete documentation index, see [llms.txt](https://knowledge.illumina.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://knowledge.illumina.com/microarray/general/microarray-general-reference_material-list/000001518.md).
# Resetting the TeFlow Water Re Circulator Air Filter Alarm
The VWR water re-circulator may display maintenance-related messages to indicate when routine servicing is required. Common messages include:
####
#### **Service Air Filter and Reset**
This notification indicates that the air filter requires inspection, cleaning, or replacement. Over time, dust and debris can accumulate within the filter, restricting airflow into the system. Reduced airflow can impair heat exchange efficiency, causing the unit to work harder to maintain the desired temperature.
**Figure 1.** Water re-circulator displaying the message "Service air filter and reset."
####
#### **The Fluid Should Be Replaced**
This message indicates that the circulating fluid (typically water or a water-based coolant) has reached the end of its recommended service interval and should be replaced. Over time, the fluid can become contaminated with particulates, microorganisms, or chemical degradation products, which may compromise system performance.
**Figure 2.** Water re-circulator displaying the message "The fluid should be replaced."
**To reset the alarm, follow the steps below:**
1. Make sure the water re-circulator is switched off or set to standby mode.
**Figure 3.** Water re-circulator control panel displaying standby mode.
2. Open the Front Panel by pulling forward. The air filter will then be accessible.
3. Remove the filter and clean by brushing away excess dust. Once cleaned, reinsert the filter and securely close the front panel.
**Figure 4.** Left: Front panel of the VWR water re-circulator. Right: Water re-circulator with the front panel removed, showing the accessible air filter.
4. To reset the service counter, switch on the water re-circulator and press the **Menu** button.
**Figure 5.** Menu button on the water re-circulator control panel.
5. From the touch screen press the **Service** Button to access the Service Menu.
6. Press both the **Reset** buttons located on the right hand side next to **Air filter service interval** and **Fluid service interval**. This will reset the service counters to 180 days.
**Figure 6.** Reset counter buttons on the water re-circulator service menu.
**Reference:**
* [VWR Circulating Baths User Manual](https://digitalassets.avantorsciences.com/adaptivemedia/rendition?id=4add559d18111547bc5422fbc6856dca8d140c5b\&vid=41e56e5af5d2f139b8c80632a4c3e859245ee7df\&prid=original\&clid=SAPDAM)
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| *For any feedback or questions regarding this article (Illumina Knowledge Article #1518), contact Illumina Technical Support* [*techsupport@illumina.com*](mailto:techsupport@illumina.com?subject=Question%2FFeedback%20Regarding%20Illumina%20Knowledge%20Article%20#000001518%20-%20Microarray%20\&body=Dear%20Illumina%20Technical%20Support,%0D%0A%0D%0A)*.* |
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