Question about Zodiac Nature 2 Cra30 Replacement Cartridge

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Can't adjust the chlorine output level of Zodiac LM3-15

I can't adjust the chlorine output level of my zodiac LM3-15 past 2-3 LED bars, and the check salt light stays on even though there is heaps of salt in the pool. So far the pool is staying clear, is it possible that my chlorinator cell may be faulty?

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Nost often it just needs to be cleaned. Calcium build up can clean in a tub of 1 Part muratic acid to 5 parts warter. or a 2 to 1 soultion of vinigar and water, otherwise it could be faulty. Cleaning typically works.

The Pool Tech

Posted on Jul 14, 2010

  • Chillywinter Nov 03, 2010

    I had this exact fault on my LM3. I put up with it for 1 year until the LM3 totally died. When I pulled it apart, a regulator IC LM317T was blown up. I replaced the LM317T, and immediately it started getting very hot. I measured the output pin and it was at 5 volts; it should be at 12 volts. I removed the display board, and the pin went to normal 12 volts. When I reconnected the display board I discovered a HEX-INVERTED IC was getting very hot. I unsoldered the IC, and soldered in a new CD4049 IC. This fixed the voltage rail, and fixed my original LED not going past 2 LEDs and salt LED constantly on problem.
    I suspect your CD4049 IC is faulty. It is a $3 component from any electronics store, but needs a competent solder-er (someone who has soldered tranistors and integrated circuits before will have no problem) to do the job. I soldered in a 16-pin socket first, so that I can replace the IC again easily next time. (The socket costs an extra $2).



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I have the zodiac duoclear system and have used it for nearly two years. All in all, it's a very good system. I have had similiar issues on occassion. Have you tried the master reset button on the lower right hand face of the control board? I've been able to clear up the lights by resetting the system.

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Keys with the Duoclear system: Salt content and clean the filters regularly. Don't know if this will solve your problem or not, but good luck.

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