The check/clean cell light could also be low flow. What are you doing that might restrict flow?

Examples could be vacuuming and using solar panels if you have them at the same time. The filter needs to be backwashed more frequently, especially when curing the plaster. A possible restriction in the suction line to the pump.

Any of these factors could affect the flow.

I would also get a good salt test kit. The one from Taylor (#K1766) will help to set up your salt concentration. Some of us use salt meters at 4 - times the price, but I don't like them. It's your call.