T cell 40 tests ok but not making chlorine??

[TNT99]

The green lights that are on are for pool/spa and filter which is normal. I havent had any error messages or red lights. It acts to be what I know as normal. The goldline equipment is now 4 years old.
Yes i increased run time from 8 hrs @ 3450 to 12 hrs @ 1750 and 2 hrs @2000 for the vacum,Total 14 hours.
TC=0, FC=0,CC=0,pH=7.9,TA=9.5,CH=470.Stabilizer (CYA)?90ppm, salt=2900ppm, additionally Nitrate=3, Nitrite=0,and Phosphate=200.

Thanks for your help.

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Also, since the chlorine levels have been zero, we have had algae blooms (small green spots). What we've read so far, it seems to be black algae. The finish is aggregate. How is the best way to treat this since we're having the chlorinator trouble? Thanks.