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I have a 20 year-old Aqua Logic PS-4 with Hayward salt chlorinator, Pentair Max-E-Therm NG heater, pool with spillover spa, separate pool and spa lights. Recently had display issues and HLS error on the heater so replaced display board, keypad, thermister, high limit switch, thermal regulator...

I'm trying to determine if i need to purchase a new main board GLX-PCB-PRO for my Hayward Pro Logic Automation system. All functions seem to operate correctly except I have a constant no flow message and an inability to do any of the salt functions. I’ve replaced the flow switch but that did...