I have an LM2-24 and have a very similar problem as this post. ((Split off. JasonLion)) I just came from the pool store and my chemicals are just about perfect yet no TC or FC readings. I'm only slightly low on alkalinity. I'm running with all lights on and have super-chlorinated a few times over the past couple of weeks. I have cleaned the cell and I will say that because it is a clear cell I can see cholorine bubbles being generated or not clearly when I turn the generator on and off. As an additional comment though, when I cleaned the cell, while I was inspecting it I noticed that one of the plates in the middle had corners worn down so they were rounded. This was on one of the main plates that has one of the input cables directly attached to it. Is there any way to really test the cell to see if it's good or bad before I splurge on a new one? I have an ohm meter but not sure what I would test for. Any other suggestions? I was going to try to get a water sample directly from a return and have it tested also. Thanks for any other tips you may have.