hayward aqua plus: check system light on


TFP Expert
Mar 2, 2011
CSM stands for (Chemistry Sensing Module), this error appears when Sense & Dispense is enabled, but the Chemistry Sensing Module is not found.

Do you have Sense and Dispense?

If yes, verify that it's plugged in.

Uncle Salty

Gold Supporter
Feb 3, 2017
South Carolina
It’s a separate system for PH and ORP monitoring and a total waste of money. I’m guessing that you don’t have it and have it enabled which is why the error. Should be able to disable it in the configuration menu I believe.



Well-known member
Jun 21, 2019
Las Vegas
Are you new to the pool?

Do you have a picture of the system?

How old is the equipment?
Tnx for the ****
Yes,I'm kinda new to all the pool maintenance thing
I got the this model

The equipment is new no more than a year old

I will look if there is any enable... and see if I can disable it if I will find it


Well-known member
Jun 21, 2019
Las Vegas
You guys are amazing
I watch the video clip and think I find the problem
I didnt fix it yet but I remmber that I sow the chemistry wizard on the manue It could be that I touch it by mistake
I will try it when I get back home
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