Staff Answer
Sep 09, 2026 - 06:27 AM
First, you'll want to be clear on if the cell actually is or is not working.
If there are not any warning lights, you'll want to confirm your system's operation and review that section of the troubleshooting guide for other common issues that can cause depleted chlorine levels in the pool water.
If there are warning lights, the best approach would be to follow the comprehensive checklist under "how do i know when my cell needs to be replaced" on page 13 of the product manual. Any of the issues listed there can cause the system to trigger a warning light and stop generating, and most can have their issue fixed to restore chlorine generation. This includes:
Ensure that the pool water's salinity is in range, testing it independently using titration-based chemical test, or else a recently-calibrated digital test.
Ensure that the cell is fully cleaned (multiple times in a row if necessary, so that when fresh cleaning solution is added there is no "fizzing"). Flush cell thoroughly with a hose-end nozzle.
Ensure that all connections and cables are fully tight, fully seated, and free of debris or damage.
Ensure that water is completely filling the Cell throughout daily operation, esp. if getting daily repetitive warnings (which typically come on later in the day, not within the first few minutes of operation).
Ensure that the controller has not inadvertently been changed to a different cell-type setting (if applicable).
Ensure that the water is within normal operating temperatures.
To determine if your UL25 Replacement Cell is covered by warranty, please call or submit a support ticket with details about your purchase as well as details about the information listed above, as warranty decisions can only be authorized by our support team.
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