Question about Intex Automatic Salt Water System for Above Ground Saltwater Pool
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?
***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
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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Posted on Jan 02, 2017
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