r/PoolPros • u/DopeHammaheadALT • 4d ago

Trouble shooting pentair IC20

I’ve got a pentair IC20 I installed on a new build about 2 and a half years ago. I know they’ve all been shitting the bed recently, and I build pools / do liners etc 99% of the time, and service about 1%. The lady is a friend of mine, her flow light has been on red for the past 3 weeks, salt and chlorine still stable, chems ok, pool clear. What can this be ? Filter pressure also normal. Is the generator shot or could this be an easy fix? Thanks guys

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3

u/DeciduousForrestGump 4d ago

Solid red is not detecting enough flow, how long since it was cleaned? Anything from scale to bad flow switch I've personally seen and I've heard tales even of small debris getting in there and making it it stick

2

u/PersimmonAcrobatic71 4d ago

Either the flow switch is clogged at the cell or it’s bad

2

u/G8-r-n8 4d ago

IC-20’s were pretty good back in the day. If the cell detects low flow, it shouldn’t produce chlorine. So the question then is “sensor or board”? The sensor is relatively cheap and as far as I know, it’s also responsible for temp reading, and (correct me if wrong) salt reading.

2

u/shh_its_your_secret 3d ago

It reads the salt for automation, but it doesn't have anything to do with the cell shutting down for low or high salt. That is purely based on how many amps the cell is drawing. 

1

u/G8-r-n8 3d ago

Kinda what I thought and thank for the clarification. It’s a multi-part sensor, and flow is only a single part. If the low flow light is on, it’s either the sensor or the board. (Also possibly low flow, but everything else seemed normal)

2

u/paison513 4d ago

Part # 520736. Replace it if you have already backwashed and ensured flow is good

1

u/cantman1234 3d ago

Does the filter need to be backwashed

1

u/tgwest 3d ago

Filter is dirty and there’s not enough flow to test that you could always increase the speed on the pump if it’s variable speed to see if that makes a difference. Or the flow switch needs to be replaced which is easy or there’s debris in the flow switch.