Intellichlor IC40 flow switch issue

popechild

Member
Nov 23, 2015
8
Atlanta, GA
I've had an IC40 installed for about 4 years now and has worked great. Today I noticed the red flow light was on, and stayed on after I cleaned out all the baskets, did a roughly 90 second backwash, and unplugged/replugged the SWG. Next I did an acid clean of the IC40 (which already looked pretty clean), no difference.

Finally decided it must be the flow switch, so I tested it by wrapping a rubber band around it and the light immediately turned green. Double-checked that I didn't have anything blocking any flow anywhere, made sure the switch was aligned properly when I re-installed it, but the light stayed red again. So then I tried a final test with the entire IC40 removed from the pipeline and the rubber band off. Turned on the pump/SWG and tried just manually pushing down the sensor tab with the end of a screwdriver. Red light the whole time, but did get to visually confirm significant water flow pumping out.

Put everything back together with the rubber band back on temporarily and it's happily chugging away with the green light for now.

Any ideas what else I could test? Seems strange that the rubber band works, but manually pushing it down without the rubber band doesn't. I'd assumed the sensor would either be good or bad. Almost seems like it's part-way bad, like it no longer works with normal water pressure, but will still work with a significant amount of pressure (rubber band.) Do I have a bad flow switch?
 

JoyfulNoise

TFP Expert
Platinum Supporter
May 23, 2015
17,207
Tucson, AZ
Likely a bad flow switch. The rubber band would bring the magnet closer to the reed switch than water flow will. Strange the screw driver test did not work but it sounds like the switch has gone bad. You should replace it.
 

popechild

Member
Nov 23, 2015
8
Atlanta, GA
Thanks for the replies. I removed the rubber band again and now it appears to be working again, at least for the moment. Will keep an eye on it and assume I'll need to replace it sooner than later.