Replacement for obsolete Zodiac R0403900 Front LED Printed Circuit Board


New member
May 30, 2020
My PCL1400 system is not generating chlorine. I referred to my troubleshooting guide and made all the measurements as directed. The salt cell voltage was nominal and all the board readings were ok, including the transformer voltage on the back board, cell current flow on front board, ac voltage on front board, salinity test, pool temperature test, except for the chlorine production rate test, which gave me an "HH" indication. My guess is that the board is bad. I searched up and down the internet to find a replacement R0403900 without any luck. It must be so obsolete it's off the streets now.

My question is, is there a more current one-for-one replacement for this board that is available?

Thanks in advance.