Lowered CYA it came right back up

JamesW

TFP Expert
Mar 2, 2011
16,590
If you power the control box and check the diagnostic readings, that should give us an idea if it will work.

What's the serial number on the box door?

The serial number should start with 3A or 5A.
 

JamesW

TFP Expert
Mar 2, 2011
16,590
If you push the little black button next to the display, what are all of the numbers?

The box is from November 2009. So, about 10 years old.

Looks like the thermistor is probably going bad. It's replaceable if you can solder. Quarter sized black disk upper right.


Other than that, I suspect that if you clean the board of spiderwebs and debris, it will probably work.
 

JamesW

TFP Expert
Mar 2, 2011
16,590
It's a 10 year old cell. The discoloration is typical sun damage. The cell is probably dead. You can add the salt to the pool and try the system to see if it works. If the cell is bad, you can always get a new one.