I am pretty sure my older version aquarite system is set for a t-5 and I am using a t-15. My salt readings are displaying 4800 when actual is 2900. It occasionally locks out for false high salt. The problem is I can not locate the j4 jumper on the PCB. Can someone please direct me? Photo of my board attached The unit is a G1-939013a. Firmware is v1.45. “Goldline controls 2009” printed on the board. I would be most grateful for any help or suggestions.
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