If you're getting a "Check Cassette" Alert in the Purezone app, or if the Purezone failed to measure any water chemistry parameters, it indicates an error may have occurred while attempting to read the chemistry pads in the Cassette due to one the following reasons:
- Obstruction in the Purezone's optical path
- Fine debris in the spa that got inside the cassette housing
- The cassette is not seated properly
- The cassette is empty
Follow the steps below to troubleshoot:
- Remove the Purezone from the spa
- Ensure that the spa is clean - without any fine debris or contaminants. If there is debris, clean it out of the spa before proceeding. If your spa is not always covered, you should always ensure that the spa is free of small debris, insects or contaminants or the device will stop measuring.
- Remove the cassette from the Purezone cassette housing
- Check the bottom of the cassette holder for any debris. If there is any debris, remove it.
- Turn the cassette over. The Purezone cassette has a plastic strip with small pads that rotates in the cassette whenever a measurement is performed. If you can see the plastic strip with pads, then the cassette still has remaining measurements. If however, the plastic strip is not visible or if you see the plastic strip with no pads, then the cassette is empty and needs to be replaced. If the cassette still has the plastic strip with pads, continue.
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Using a clean cotton cloth dampened with water, wipe the optical windows clean. See the images below that shows the 3 optical windows that require cleaning.
- Submerge both the Sensor unit and the cassette in the water, and shake the cassette a bit to let out any excess air or bubbles. If there is any fine debris in the cassette, the shaking will expel the debris as well during this step. With both the cassette housing and cassette submerged, insert the cassette in the sensor unit until you hear a click to ensure it is seated properly.
- Replace the Purezone in the spa ensuring that the metal strip on the cassette housing is pointing toward the spa water and not toward the back of the spa.
- Perform a "Measure Now" or wait for the next scheduled reading.
If you have completed the above troubleshooting, have waited 24 hours, and the Purezone App still shows the "Check Cassette" alert, please submit a Support Request.