Pentair IC40 salt reading keep going up, bad sensor?

[LearningAboutPools]

About a month ago my IC40's salt readings started going up.

My pool has been at 3900 or 3800 since I first put salt in it when it was built a year ago.

I'm testing with a digital salt . measuring tool and it reads 3930. My Taylor kit comes in right around there too (4,000 or 3,800).

My IC40 has started going higher and higher and is 5000 now.

I cleaned the IC40 with muriatic acid per the cleaning instructions but it hasn't made any difference.

Thoughts or suggestions?

If it was just high I'd recalibrate, but it is steadily increasing so I'm not sure how to address this?

 

[mknauss]

Is the IC40 indicating high salt via the lights?

 

[Jimrahbe]

L,

The IC40 does not really measure the salt level, it looks at how conductive the water is, and makes a wild guess. The water temp is part of this guess. The IC40 uses a thermistor inside the flow switch to measure the water temp. When this thermistor goes bad, the salt readings are often off.

If the IC40 is under warranty, have Pentair come and fix it. It not, installing a new flow switch is a pretty easy DIY project.

Thanks,

Jim R.

 

[LearningAboutPools]

Thank you and yes it shows flashing green light.

The water temp is warmer than usual due to the hot weather.