Roadrunner Pool Services › Guides › Repair
Low output, no-flow errors and a scaled cell usually have the same root cause, and it is not the cell's fault.
Salt chlorine generators are a good fit for this valley. The cell is a consumable, though, and how long it lasts depends almost entirely on what the water around it has been doing.
In our water a cell typically gives three to five years. That is a real range, not a hedge: two identical systems on the same street can sit at either end of it depending on chemistry and run hours.
A salt cell works by electrolysis, and the process creates a locally high-pH zone right at the plates. In hard water that is an invitation for calcium to deposit. A scaled cell produces less chlorine, which tempts people to turn the output up, which runs the cell harder and scales it faster. Keeping pool pH in range is the single biggest thing that extends cell life. Periodic inspection and a proper acid rinse when it is actually needed helps; rinsing a cell that does not need it wears the coating for nothing.
A no-flow error means the system is not seeing enough water movement to generate safely. Nine times out of ten the cause is upstream: a loaded filter, a clogged pump basket, a partially closed valve, a failing pump, or a flow sensor that has simply worn out. Replacing a perfectly good cell because the controller threw a flow error is a common and expensive mistake.
Check the salt level first, then the water temperature. Cold water suppresses output, which is why a system that was fine in August looks weak in January. Then the control board and the transformer, both of which fail on their own schedule. We test the chain rather than replacing the most expensive part first.
Some older control boards are no longer made, and no amount of diagnosis changes that. When the fix is a part that does not exist, we say so and price the replacement rather than charging you to look at it twice.