I am wondering if you have any advice for me before I call out a pool professional to work on my chlorinator. I would like to know how to test my chlorinator DC level and/or current level with a multimeter. I have Zodiac Jandy m/n APUREM. It is reporting Service LED with code number 121 (Low current in reverse direction to Cell.). The recommendations are 1. Clean cell if necessary (see Section 6.3). 2. Check DC Cord. I cleaned it with water hose and mild muriatic acid solution after finding some small mineral buildup in a few spots and some grainy surface accumulation throughout. I also disconnected and reconnected the 3-terminal connector on top of the cell several times as well as brushing the pegs with a green pad. I reinstalled the cell and plug; after a while the code 121 returned. Then I measured the voltage of the plug. From center to each outside hole was 9.02 and 9.08 VDC; 0 VDC from outside to outside hole. I traced the cord into the control box, disconnected the two plugs and measured there, getting 8.75 VDC (+/- 0.03) for all production levels from 5% to 100% (including boost). These measurements were taken when the plug was disconnected from the cell and while the controller LEDs that were lit were: Power on, cell on, flow, and cell reverse. The service LED would come one and go off, but the voltage in either case was the same 8.75 VDC. After reconnecting the cord I remeasured and got 8.96 VDC center to outer holes. The owner manual does not list the expected voltage.
Also, since the code indicates that forward direction is not failing, if I plug the DC cord in 180 degrees will that swap the meaning of forward and reverse so that reverse will then work and forward will be low current? If so, then I can keep the cell from accumulating minerals by swapping it ocassionally.