Question about Intex Automatic Salt Water System for Above Ground Saltwater Pool

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Code 91 beeps even when my salt readings are 3200 PPM

I have tried & taken back 2 NEW chlorinators because code 91 keeps coming up (low salt). I have tested my water which shows 3200 PPM. Has anybody else had this? I keep adding salt in small doses and now my salt readings show 3600 PPM. What now?

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  • David Jan 16, 2013

    Could be low current to the unit - power supply over extention cords and through RCDs etc can cause significant voltage drop and odd behaviour by almost any electrical device.

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***This is how you fix the unfixable code 91***

Code 91 is generated by lack of conductivity between plate 1 & plate 3 of the titanium plate set. This can be caused by 3 possibilities.

1. The salt is low - easily tested
2. The Plates are covered with lime scale - easily cleaned with vinegar
3. The one or both of the connections to the plates are corroded and there is
a break in the circuit

I took a meter to my salt cell ( the tube with the plates in it). The outer 2 plates should have continuity with the plug prongs on their respective sides (where the unit plugs in to the control unit) The middle plate is not connected to either plug.
One of my prongs did not have continuity to the plate (thus the cell generated a code 91 - because there was no voltage to detect.

I took a dremel tool and cut a one inch square out of the back of the housing. I then used a round ball bit in the dremel to remove the plastic around the back of the prong. The back of the plug is conneted to the metal tab that is attached to the titanium plate via a 9/32 post and nut. What happens is that water intrudes from the seam in the front of the prong and corrodes the bolt face and the tab surface creating the break in the circuit. I removed the corrosion and applied dielectric grease (used on headlight bulbs and available at the auto parts store) to the back of the nut and the shaft of the bolt and reinstalled. I tested with the ohms/resistance setting of my multimeter and found the circuit complete.
I then applied a covering of epoxy to the post and bolt and replaced the one inch piece of plastic that I removed and epoxied over the area. I sealed the front of the prongs with epoxy- there is a small area where the metal and plastic meet where the water entered. After reinstallation and hooking the machine up it functions perfectly. Intex is sending me a new unit under warranty-- as soon as it arrives I will seal the front of the prongs with some epoxy and store just in case.

Posted on Jun 14, 2012

  • James Kilbride Jul 05, 2012

    Gill, could you shoot off some pics? Have the same problem, followed your suggestion, want to make sure it looks similar before I button it up....

  • James Kilbride Jul 06, 2012

    Your solution worked perfect. Thanks!

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This may seem silly but make sure the salt you used was not iodized. I had the same problem and didnt realize my mistake

Posted on Jul 02, 2009

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Need code info


code 91 is low salt
do not just guess at it! even the recommended amount in the manual is just that, a starting point
It is up to you to fine tune it

Get a salt test kit that reads in #'s not color
Now get your pool to as close to 3000ppm as possible
under 2700 will cause the system to not produce enough chlorine
any higher than 3500ppm and you can go cloudy, trigger high salt alarm, and even taste terrible
Here is a link to manuals so you can see all other codes
http://www.intexcorp.com.hk/proifv/proifv_dl_client.jsp?source=intexstore

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Hello,
the amount of salt that they reccomend in the book is just a starting point
You need to get a salt test kit that reads in #'s not colors
Get your pool to as close to 3000ppm as possible
lower than 2800ppm and you will not produce enough chlorine
any higher than 3500ppm and you can trigger high salt alarm, have bad tasting water, or even get cloudy water
Like you have done, when adding salt , filter only for 6 hours or so to fully disolve

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